Weather Data 1991 Reported from Research Centers .......... 2

Flow of Water and Particles in Soils and Porous Media (D. Swartzendruber) .......... 9

Soil Respiration in Ridge Till (M. A. Liebig, A. J. Jones, J. W. Doran, and L. N. Mielke) .......... 11

Wheel Traffic Effects on Soil Properties in Ridge Till (M. A. Liebig, A. J. Jones, L. N. Mielke, and J. W. Doran) .......... 15

Fallout Cesium - 137 to Assess Soil Erosion (T. Oztas, A. J. Jones, L. N. Mielke and R. Grossman) .......... 21

Response of Wheat to Phosphorus Placement Under Three Tillage Systems in a Wheat Fallow Rotation (R. A. Nielsen, D. D. Baltensperger and F. N. Anderson) .......... 25

Evaluation of Soil Testing for Nitrate-Nitrogen (Edwin J. Penas) .......... 29

Quantifying Nitrate Leaching Under Continuous Corn Versus a Corn-Soybean Rotation (Norman L. Klocke, Gary W. Hergert, and Joel P. Schneekloth) .......... 35

Influence of Early Ammonium Nutrition of Corn Growth & Grain Yield (Gary W Hergert) .......... 41

Winter Crop Effects on Nitrogen Management of Irrigated Corn (Richard B. Ferguson, James F. Power, and Glen P. Slater) .......... 51

Nitrogen Fertilization of Corn Following Soybean (R. B. Ferguson, R. Selley, and G. P. Slater) .......... 59

Nitrogen Fertilization of Smooth Brome 1989, 1990, 1991 (R. B. Ferguson and G. P. Slater) .......... 65

The Effects of a Urease Inhibitor on Volatile Ammonia Loss and Urea Hydrolysis on Irrigated, Ridge Till Corn (Timothy L. Murphy and Richard B. Ferguson) ..........71

Burlington Northern Nitrogen Management Study (R. B. Ferguson, G. W. Hergert, J. S. Schepers, and G. P. Slater) .......... 77

Effect of PB-50 (penicillium Bilagi) on Phosphorus Fertilizer Efficiency for Wheat and Soybeans (D. H. Sander) .......... 91

Fertilizer P Distribution in Bands and Wheat Yield (D. H. Sander) ..........97

Long Term Effects of Different Methods of Applying P on Crop Yields (D. H. Sander and M. A. Zerkoune) .......... 99

Effect of Residual Phosphorus Bands on Crop Yield and Their Persistence in the Soil (M. A. Zerkoune, D. A. Shapiro and D. H. Sander) .......... 103

Increasing Anhydrous Ammonia Efficiency of Irrigated Corn in Nebraska (M. Marake, D. H. Sander, and D. T. Walters) .......... 113

Effect of Nitrogen Rates and P Placement Methods on Corn Grain Production on a High Calcareous Rainfed Soil in Northeast Nebraska (Charles A. Shapiro) .......... 121

Tillage, Rotation and N Rate Effects on Dryland Corn Production and Nitrogen Uptake in Northeastern Nebraska (D. T. Walters and C. A. Shapiro) .......... 125

Evaluation of Tillage, Rotation, Nitrogen and Cover Crop Effects on Nitrogen Cycling (K. Anabayan, D. T. Walters and D. H. Sander) .......... 135

Effect of Super Slurper and Phosphorus (P) on Corn and Wheat Yield ......................1

Selection of Time and Source of Nitrogen for Increased Efficiency of Applied Nitrogen ...................... 4

Effect of Method(s) of Applying P on Winter Wheat Grain Yield ...................... 8

Effect of Timing of Knifed in P on Winter Wheat Grain Yield ...................... 10

Winter Wheat Yield and Grain Quality as Influenced by Dynam (Lenaire product) ...................... 13

Corn Experiments

Effect of Spacing of Phosphorus Fertilizer Band on the Yield and Plant P Uptake of Corn ...................... 19

High Yield Corn-Soybean-Wheat Rotation Study ...................... 25

Fertilizer Management in Reduced Tillage Systems for Sprinkler-- Irrigated Corn ...................... 27

Genotypic Variation for Postanthesis Nitrogen Uptake and Distribution by Maize ...................... 32

The Effect of Planting Date, Fertilizer Recommendations and Starter Material on Corn (Zea mais) When Grown in a No-till System ...................... 35

Effect of Acid Fertilizer on Corn (Zea mays) Grain Yield ...................... 38

Soybean Experiments

An Evaluation of Foliar Applied Materials on Soybeans ...................... 41

Soybean Variety Evaluation on High pH Soil - 1985 ...................... 43

Other

Dynamics of Water in Rigid and Swelling Soils ...................... 64

Water and Nitrogen Interactions in Dryland Cropping Systems ...................... 65

Fertilizer Management for Native Subirrigated Meadows ...................... 69

Volcanic Ash and Associated Clay Minerals in Mitchell and Tripp Soils ...................... 72

Variation in Soil Properties Along a Hillslope ...................... 76

Soil Test Lab Comparison Results for 1985 ...................... 79

Effect of Long Term Seed and Broadcast P on Winter Wheat Yields .......... 1

Effect of Method and Time of P Application on Winter Wheat Grain yield .......... 3

Corn Experiments

BKR Demonstration Farm - Comparison of Lime Sources and Rates in a Corn-Soybean Rotation .......... 5

Effect of Band Spacing on the Effectiveness of Dual Placed N and P on Corn Yield and P Uptake .......... 8

Effect of Broadcast Phosphorus on P Response of Ridge-Planted Corn .......... 10

High Yield Corn-Soybean-Wheat Rotation Study .......... 12

The Influence of Soil Bulk Density, Soil Water Regime and Fertilization on the Uptake of P and K by Corn .......... 17

Long Term Effects of N-Serve on Improving Nitrogen Use Efficiency for Furrow Irrigated Corn .......... 20

Maximizing Fertilizer N and Water Use Efficiency on Irrigated and Rainfed Corn ...... 25

Phosphorus Placement for Irrigated Corn .......... 27

Residual Effects of Growing Corn After Fertilizing With Different Soil Test Recommendations .......... 34

Tillage, Rotation and N Rate Effects on Dryland Corn Production and Nitrogen Uptake in Northeastern Nebraska .......... 38

Soybean Experiments

Soybean Variety Evaluation on High pH Soil-1986 .......... 43

Fertilizer Experiments

Effect of N Fertilizer Rate and Nitrification Inhibitor on N Uptake and Leaf Chlorophyll Content of Several Corn Hybrids .......... 62

Effect of P Application Rate and Band Spacing on the Movement of P From the Injected Band in Three Soils .......... 65

Effect of Time and Source of Nitrogen for Increased Efficiency of Applied Nitrogen .......... 68

Evaluation of the Influence of Starter Fertilizer on Corn and Grain Sorghum .......... 74

Long Term N Rate Study at North Platte .......... 76

Nitrogen and Irrigation Management Demonstration Project .......... 78

Nitrogen Fertilization of Smooth Brome .......... 82

Other Experiments

Cropping Systems Approach to Soil and Water Conservation .......... 84

Dynamics of Water in Rigid and Swelling Soils .......... 89

Economic Effects Associated With the Use of a Rootplow Along Tree Windbreaks in Northeast Nebraska .......... 90

Application of Fertilizer with Tillage Equipment Used in Row Crop Production .......... Section 1

The Influence of Source of N, N Rates, and a Nitrification Inhibitor on the Yield of Pivot Irrigated Corn Grown on a Sandy Loam Soil .......... Section 2

The Influence of Two Different Starter Fertilizers on Grain Yield of Eight Hybrid Varieties Grown on Cass Fine Sandy Loam Containing Free Lime .......... Section 3

The Influence of Limestone and Promesol-30 on Soil pH and Yield of Irrigated Corn Grown on a Crete Silty Clay Loam Soil .......... Section 4

The Influence of Acid-forming Material on Irrigated Corn Grown on High pH Soil .......... Section 5

Effect of Different Methods of P Application on Irrigated Corn Production ..... Section 6

Effect of the Amount of Ammonia Applied with APP on Irrigated Corn Yield .......... Section 7

Preplant UAN Solution With and Without N-Serve on Irrigated Corn .......... Section 8

Improving Nitrogen Fertilizer Recommendations on Corn .......... Section 9

Improving the Efficiency of Fertilizer N Use by Irrigated Corn .......... Section 10

Influence of Rates of K and Mg for Corn Production on Irrigated Sandy Soils .......... Section 11

Source and Rate of Sulfur for Corn Production on Silt Loam Soils .......... Section 12

Evaluation of Lime for Corn Production on Irrigated Sandy Soils .......... Section 13

Acid Neutralized Ammonia Through Sprinkler Irrigation .......... Section 14

Deep Placement of N Fertilizer for N-Deficient, Irrigated Corn .......... Section 15

Placement of Fertilizer-P for Corn Production on P Deficient Soils in the Eastern Great Plains .......... Section 16

Salt Effect of Urea Phosphate Fertilizer .......... Section 17

Crop and Soil Response to Applied P and K in a Long-Term Buildup/Depletion Study .......... Section 18

Effects of Different Iron Products on Reducing Iron Chlorosis in Corn .......... Section 19

Nitrogen Rates and Sources for Ecofallow Corn .......... Section 20

Wheat Experiments

Nitrogen and Phosphorus Needs for Winter Wheat in Nebraska .......... Section 21

Dual Placement of Nitrogen and Phosphorus on Wheat .......... Section 22

Soybean Experiments

Efficient Nitrogen Use Following Soybeans in Rotation .......... Section 23

Time of Irrigation and N Application for Optimum Soybean Production .......... Section 24

Sugarbeet Experiments

Soil Compaction Removal and Its Effects on Sugarbeet yield .......... Section 25

Forage Experiments

Response of Alfalfa Grown on Irrigated Sandy Soil to the Application of P and S .......... Section 26

Effect of Potassium Fertilization on Production of Alfalfa Grown on an Irrigated Sandy Soil .......... Section 27

Fertilizer Management for Forages Established with Reduced Tillage Techniques .......... Section 28

Other Experiments

Economic, Agronomic and Environmental Impacts of Varied Soil Testing Philosophies .......... Section 29

Physics of Water in Soils and Porous Media .......... Section 30

Soil Nitrogen Changes in Fallow Systems .......... Section 31

Nitrogen Management for Irrigated Corn and Grain Sorghum .......... Section 32

Distribution of Mineral Nitrogen under Native Range and Cultivated Fields in the Nebraska Sandhills .......... Section 33

High Yield Corn-Soybeans-Wheat Rotation Experiment .......... Section 34

Waste Resource Recycling in Soils .......... Section 35

Nitrogen Rates on Corn ................ Section 1

Anhydrous Ammonia and N-Serve for Irrigated Corn ................ Section 2

Placing Ammonia and APP Together for Irrigated Corn Production ................ Section 3

Nitrogen Rate and Source Studies for Corn Grown in an Ecofallow Rotation ................ Section 4

Comparison of Standard Nitrogen Fertilizers with Delayed Release and Nitrification Inhibiting Materials for Irrigated Corn on Sharpsburg/Bu1ter ................ Section 5

Nitrogen Balance Under Irrigated Corn Using ¹⁵N-Depleted Fertilizer ........... Section 6

Improving the Efficiency of Fertilizer N Use by Irrigated Corn ................ Section 7

Effect of Fertilizer Phosphorus Placement on Corn Yields in Sandy Soil ................ Section 8

Influence of Rates of K and Mg for Corn Production Irrigated Sandy Soils ................ Section 9

Application of Sulfur for Irrigated Corn on Sandy Soils ................ Section 10

Effect of Different Iron Products on Reducing Chlorosis in Corn ................ Section 11

Effect of Salt Content of the Starter Fertilizer and Distance from the Seed on the Growth and Yield of Corn ................ Section 12

Effect of Irrigation Well Capacity and Plant Population Production of Irrigated Corn on a Silt Loam Soil ................ Section 13

Wheat Experiments

Wheat Fertilization Progress Report ................ Section 14

Phosphorus Rate X Placement of Winter Wheat in Southeast Nebraska ................ Section 15

Dual Placement of Nitrogen and Phosphorus on Wheat ................ Section 16

Soybean Experiments

Rate and Placement of Phosphate Fertilizer for Soybean Production ......... Section 17

Forage Experiments

Response of Warm-Season Prairie Grasses to the Application of N and P with and without the Use of Atrazine ................ Section 18

Response of Alfalfa Grown on an Irrigated Sandy Soil to the Application of P and S ................ Section 19

Effect of Potassium Fertilization on Production of Alfalfa Grown on an Irrigated Sandy Soil ................ Section 20

Soil Testing Experiments

Optimum Economic Use of Fertilizers Through Effective Soil Testing ....... Section 21

Crop and Soil Response to Applied P and K in a Long Term Buildup/Depletion Study ................ Section 22

Evaluation of Soil Testing for Nitrate-Nitrogen (E.J. Penas) ............. 7

Dynamics of Water in Rigid and Swelling Soils (Dale Swartzendruber) ............. 13

Atrazine Movement as Affected by Pore Size Distribution in a Silt Loam Soil (J.U. Baer, W.L. Powers, P.J. Shea, D.A. Tupy, and C.L. Stueffer-Powell) ............. 15

Effects of Residual Phosphorus Bands on Crop Yield and Their Persistence in the Soil (Mohammed A. Zerkoune, C.A. Shapiro, and D.H. Sander) ............. 19

Nitrogen Fertilization of Smooth Brome (A.B. Ferguson and G.P. Slater) ............. 23

The Effects of a Urease Inhibitor on Volatile Ammonia Loss and Urea Hydrolysis on Irrigated, Ridge Till Corn (Timothy L. Murphy and Richard B. Ferguson) ............. 27

Winter Cover Crop Effects on Nitrogen Management of Irrigated Corn (Richard B. Ferguson, James F. Power, and Glen P. Slater) ............. 31

Tillage, Rotation and N Rate Effects of Dryland Corn Production and Nitrogen Uptake in Northeastern Nebraska (D.T. Walters and C.A. Shapiro) ............. 41

Increasing Nitrogen Use Efficiency by Dryland Sorghum Under Conventional and No-tillage Systems (M.V. Marake, D.T. Walters, and D.H. Sander) ............. 51

Residual Effects of Treatments Applied to the Soil Test Lab Comparison Study (Gary W. Hergert, Charles A. Shapiro, and D.H. Sander) ............. 59

Using N-Serve to Modify Plant Available Ammonium and Nitrate for Corn (Gary W. Hergert) ............. 65

Spatial Variability of Nitrate-Nitrogen in Nebraska Corn Fields (Gary W. Hergert, Frank N. Anderson, Charles A. Shapiro, Richard B. Ferguson, Edwin J. Penas, and Kenneth D. Frank) ............. 71

Soil Test Lab Comparison Experiment on the B-K-R Demonstration Farm (Gary W. Hergert, Dennis Bauer, and Bud Stolzenburg) ............. 79

Field Evaluation to Determine Best Fluid Fertilizer for Corn (A. A. Wiese, and E.J. Penas) ............. 85

Increasing Anhydrous Ammonia Efficiency on Irrigated Corn in Nebraska (M. V. Marake, D. H. Sander and D. T. Walters) ............. 95

Evaluation of Tillage, Rotation, Nitrogen and Cover Crop Effects on Nitrogen Cycling (K. Anabayan, D. T. Walters and D. H. Sander) ............. 99

Improving Nitrogen Fertilizer Recommendations for Corn .......... Section 1

The Influence of 7-21-7 Plus Ammonium Thiosulfate Knifed-in With Anhydrous Ammonia on Yield of Irrigated Corn Grown on Calcareous Soil .......... Section 2

Interseeded Rye and Alfalfa in Irrigated Corn Production .......... Section 3

Maximizing Fertilizer N and Water Use Efficiency on Irrigated and Rainfed Corn .......... Section 4

Nitrogen Balance for Continuous Corn .......... Section 5

High Yield Corn-Soybeans-Wheat Rotation Study .......... Section 6

Wheat Experiments

Dual Placement of Nitrogen and Phosphorus on Winter Wheat .......... Section 7

Effect of Depth of P Application on the Yield of Winter Wheat .......... Section 8

Influence of Rate and Placement of Phosphorus Fertilizer on the Grain Yield of Winter Wheat in Southeast Nebraska .......... Section 9

Results of 1982 Fertilizer Experiments on Wheat .......... Section 10

Soybean Experiments

Influence of Agroplus on Irrigated Soybean Yield .......... Section 11

Time of Irrigation and N Application for Optimum Soybean Production .......... Section 12

Lime-Induced Chlorosis in Soybeans .......... Section 13

Sorghum Experiments

Efficient Nitrogen Use Following Soybeans in Rotation .......... Section 14

Other Experiments

Availability of Nitrogen Fertilizer as Affected by Tillage .......... Section 15

The Effects of Time and Tillage on Soil Nitrogen in a Wheat Fallow Rotation .......... Section 16

Deep Soil Sampling to Improve Fertilizer Recommendations .......... Section 17

Crop and Soil Response to Applied P and K in a Long-term Buildup/Depletion Study .......... Section 18

Availability of Three Different Phosphatic Fertilizer Sources on Four Soils .......... Section 19

Plant Response to Added Topsoil and Fertilizer on an Eroded Loess Soil ..... Section 20

Potassium Release From Mica, Feldspar, and Mixed Mineralogy Systems ..... Section 21

Physics of Water in Soils and Porous Media .......... Section 22

Soil Test Comparison Results in 1982 .......... Section 23

Improving Nitrogen Fertilizer Recommendations on Corn .......... Section 1

Anhydrous Ammonia and N-Serve for Irrigated Corn .......... Section 2

Nitrogen Management for Irrigated Corn and Grain Sorghum .......... Section 3

Effect of Different Methods of P Application on Irrigated Corn Production ..... Section 4

Improving the Efficiency of Fertilizer N Use by Irrigated Corn .......... Section 5

Influence of Rates of K and MG for Corn Production on Irrigated Sandy Soils .......... Section 6

Application of Sulfur for Irrigated Corn on Sandy Soils .......... Section 7

Effect of Different Planting Systems and Row Applied P on Corn Yields ..... Section 8

Influence of Clay Content, pH, and Distance from the Seed of a Suspension Fertilizer on Corn Production .......... Section 9

Nitrate Distribution Under Irrigated Corn .......... Section 10

Evaluation of Lime for Corn Production .......... Section 11

Source and Rate of Sulfur for Corn Production on Silt Loam Soils .......... Section 12

Influence of Boron on Barren Stalks and Grain Yield .......... Section 13

Effects of Different Iron Products on Reducing Iron Chlorosis in Corn .......... Section 14

Wheat Experiments

Fertilizer Needs for Wheat in Nebraska .......... Section 15

Influence of Nitrogen and Phosphorus Fertilizer on the Grain Yield of Winter Wheat in Southeast Nebraska .......... Section 16

Dual Placement of Nitrogen and Phosphorus on Wheat .......... Section 17

Soybean Experiments

Rate and Placement of Phosphate Fertilizer for Soybean Production .......... Section 18

Effect of Various Products in Reducing Chlorosis in Soybeans .......... Section 19

Forage Experiments

Response of Alfalfa Grown on Irrigated Sand Soil to the Application of P and S .......... Section 20

Effect of Potassium Fertilization on Production of Alfalfa Grown on an Irrigated Sandy Soil .......... Section 21

Soil Test Experiments

Comparison of Laboratory Soil Test Recommendations for Corn .......... Section 22

Buildup/Decline in Soil P and K .......... Section 23

Soil Physics Related Experiments

Physics of Water in Soils and Porous Media .......... Section 24

Tillage Related Experiments

Fertilizer Management for Forages Established with Reduced Tillage Techniques .......... Section 25

Application of Fertilizer with Tillage Equipment Used in Row Crop Production .......... Section 26

Environmental Quality Experiments

Groundwater N and Fertilizer Management .......... Section 27

Soil Chemical Measurements

Problems in Mineral N Determination by Steam Distillation Due to Carbonates .......... Section 28

Nitrogen Rates on Corn .................. Section 1

Nitrogen Rates for Corn Grown in an Eco-fallow Rotation .................. Section 2

Anhydrous Ammonia and N-Serve for Irrigated Corn .................. Section 3

Nitrogen Losses from Sprinkler Applied Nitrogen Fertilizer .................. Section 4

Application of Sulfur for Irrigated Corn on Sandy Soils .................. Section 5

Lime and Boron for Corn .................. Section 6

Influence of Salt Content of Fertilizer and Distance from the Seed on Emergence and Yield of Corn .................. Section 7

Evaluation of Tillage Systems for Corn Production on a Silty Loam Soil in Northeast Nebraska .................. Section 8

Effect of Irrigation Well Capacity and Plant Population on Production of Irrigated Corn on a Silt Loam Soil .................. Section 9

Water Use Efficiency of Corn Genotypes .................. Section 10

Wheat Experiments

Wheat Fertilization Progress Report .................. Section 11

Phosphorus Rate X Placement on Winter Wheat in Southeast Nebraska .................. Section 12

Relation of Soil Properties and Other Environmental Factors to a Grain Yield and Quality of Winter Wheat Grown at International Sites .................. Section 13

Forage Experiments

Influence of Method of Seed Inoculation and Rate of Nitrogen on Establishment of Alfalfa on a Sandy Soil .................. Section 14

Influence of the Frequence of Fertilizer Use With and Without Herbicide on Production of Warm-Season Prairie Grasses .................. Section 15

Fertilizer Management for Forages Established with Reduced Tillage Techniques .................. Section 16

Soil Testing Experiments

Optimum Economic Use of Fertilizers Through Effective Soil Testing ........... Section 17

Crop and Soil Response to Applied P and K in a Long Term Buildup/Depletion Study .................. Section 18

Nitrate Recovery in Steam Distillation .................. Section 19

Nitrogen Rates on Corn .............. Section 1

Nitrogen Rates for Corn Grain in an Eco-fallow Rotation .............. Section 2

Anhydrous Ammonia and N-Serve^R for Irrigated Corn .............. Section 3

Anhydrous Ammonia and N-Serve^R Fall Applied .............. Section 4

Evaluation of Cold-Flow™ Method of Applying Anhydrous Ammonia .............. Section 5

Influence of Nitrogen Applied at Silking with a Hi-boy on Irrigated Corn ...... Section 6

Effect of Broadcast Phosphorus, Potassium and Zinc for Irrigated Corn on Sandy Soils .............. Section 7

Lime and Boron for Corn .............. Section 8

Effect of Irrigation Well Capacity and Plant Population on Production of Irrigated Corn on a Silt Loam Soil .............. Section 9

Influence of Promesol-30 and Limestone on Irrigated Corn .............. Section 10

Influence of Wex on Irrigated Corn Production .............. Section 11

Use of Humate for Corn Production in Nebraska .............. Section 12

Comparison of New and Old Shoes on a Buffalo Slot Planter in Sod ....... Section 13

Comparison of New and Old Shoes on a Buffalo Till Planter .............. Section 14

Water Infiltration and Runoff on Crete and Wymore Soils, Under Center Pivot Irrigation .............. Section 15

Wheat Experiments

Wheat Fertilization Progress Report .............. Section 16

Irrigated Wheat .............. Section 17

Plant Loss of Nitrogen .............. Section 18

Soybean Experiments

Influence of Applied N and Moisture on Total Nutrient Uptake and on Root Activity of Soybeans as Measured by ³²P .............. Section 19

Utilization of ¹⁵N Fertilizer by Nodulating and Non-nodulating Soybean Isolines .............. Section 20

Forage Experiments

Effect of Phosphorus, Potassium and Sulfur on Yield of Irrigated Alfalfa Grown on a Silt Loam Soil .............. Section 21

Effect of Rate of Boron Applied to Alfalfa grown on an Irrigated Silt Loam .............. Section 22

Fertilizer Requirements for Pasture Renovation Practices on Silt Loam Soil .............. Section 23

Fertilizer Requirements for Pasture Renovation Practices on Sandy Soils .............. Section 24

Foliar Fertilization Experiments

Foliar Fertilization of Soybeans .............. Section 25

Foliar Fertilization of Field Beans .............. Section 26

Foliar Fertilization of Potatoes and Wheat .............. Section 27

Nitrogen Losses from Sprinkler Applied Nitrogen Fertilizer .............. Section 28

Liming Experiments

Lime Requirements for Acid Sandy Soils .............. Section 29

Soil Testing Experiments

Optimum Economic Use of Fertilizers Through Effective Soil Testing .............. Section 30

Fertilizer Needs Under Conditions of High P and K Accumulation in Soils .............. Section 31

Northeast Nebraska Soil Productivity Status .............. Section 32

Etc. Etc.

Pheasant Repellency Experiments .............. Section 33

Influence of Anhydrous Ammonia Band Spacing on Irrigated Corn Grain Yield and Band Persistence .......... 9

Variable Rate Nitrogen Fertilization with Furrow Irrigation - Milton Ruhter Farm .......... 17

Burlington Northern Nitrogen Management Study .......... 25

The Effects of a Urease Inhibitor on Volatile Ammonia Loss and Urea Hydrolysis on Irrigated, Ridge Till Com .......... 37

Nitrogen Fertilization of Smooth Brome .......... 43

Evaluation of Soil Testing for Nitrate-Nitrogen .......... 47

Horizontal Sampling to Assess Agrichemical Movement .......... 55

Water Movement in Soils and Porous Media .......... 57

A Natural Gradient Transport Study of Selected Herbicides .......... 59

Tillage, Rotation and N Rate Effects on Dryland Corn Production and Nitrogen Uptake in Northeastern Nebraska .......... 63

Quantifying Nitrate Leaching Under Continuous Com Versus a Corn-Soybean Rotation .......... 73

Cover Crop Dry Matter Production for Several Planting and Harvest Dates .......... 79

Nutrient and Mass Loss of Beef Feedlot Manure During Composting .......... 83

Effect of Residual Phosphorus Bands on Crop Yield and Their Persistence in the Soil .......... 87

Comparison of Erosion Rates Estimated Using the Cesium-137 Methods and USLE .......... 95

Erosion Patterns Using Geostatistical Analysis of ¹³⁷ Cesium .......... 101

Long-Term Applications of Manure and Fertilizer in Irrigated Corn .......... 109

Evaluation of Tillage, Rotation, Nitrogen and Cover crop Effects on Nitrogen cycling .......... 115

Increasing Nitrogen Use Efficiency by Dryland Sorghum Under Conventional and No-tillage Systems ............ 1

The Effect of Phosphorus Rate, Method of Application, and Tillage on Soybean Yield in Nebraska ............ 6

Tillage, Rotation and N Rate Effects on Dryland Com Production and Nitrogen Uptake in Northeastern Nebraska ............ 15

Fertilizer

Effect of Lime Application on Soil pH and Com Yield in Holt County ............ 22

Evaluation of the Influence of Starter Fertilizer on Com and Grain Sorghum, 1989 ............ 24

Fertilizer P Distribution and Wheat Yield ............ 26

Field Evaluation to Determine Best Fluid Starter Fertilizer for Com ............ 28

Increasing Anhydrous Ammonia Efficiency .................. 34

Managing Nitrogen More Effectively for Reduced Costs and Environmental Hazards ............ 36

Using Nitrogen Fertilizer According to Soil Test ............ 40

Effect of Irrigation on Salt and Sodium Content of Salt Affected Soils in Central Nebraska .......... Section 1

Physics of Water in Soils and Porous Media .......... Section 2

Objective Indices of Water Regimes for Comparison Purposes .......... Section 3

Water by Nutrient Interaction Studies

Effects of Oscillations in Water Levels on Nutrient Uptake .......... Section 4

Yield, Water Use, and Nutrient Uptake of Corn Hybrids Under Varied Irrigation and Nitrogen Regimes .......... Section 5

Effect of Sprinkler Irrigation Timing and Amount on Yield of Different Winter Wheat Varieties .......... Section 6

Fertilizer Experiments With Corn

Response of Irrigated Corn Yields to Nitrogen Sources Applied with a Urease Inhibitor .......... Section 7

Comparison of N Sources for Corn Planted in Untilled Wheat Stubble .......... Section 8

Increased Nitrogen Utilization by Corn .......... Section 9

Pressure Injection of UAN for Irrigated Corn .......... Section 10

Crop and Soil Response to Applied P and K in a Long-Term Buildup/Depletion Study .......... Section 11

Fertilizer Experiments with Wheat, Grain Sorghum and Hay Meadows

Increasing the Efficiency of P Fertilizers .......... Section 12

Phosphorus Rate and Method of Application for Grain Sorghum .......... Section 13

Fertilizer Management for Native Subirrigated Meadows .......... Section 14

Fertilizer x Residue x Tillage x Rotation Experiments

Sources of Nitrogen Used in Corn and Soybean Production as A ffected by Crop Res; dues .......... Section 15

Corn Yields as Affected by Five Tillage-Residue Techniques and Four N Rates Applied Broadcast and Sidedress .......... Section 16

Interseeding Alfalfa or Rye in Irrigated Corn Production .......... Section 17

High Yield Corn-Soybeans-Wheat Rotation Study .......... Section 18

Placement of Nand P Fertilizers for Minimum Till Corn Under Sprinkler Irrigation .......... Section 19

Fertilizer Salt Effects on Crop Emergence

The Salt Effect of Urea Phosphate and Ammonium Po1yphosphate as Influenced by the Addition of Clay .......... Section 20

Emergence of Corn as Affected by Source and Rate of Solution Fertilizers Applied With the Seed .......... Section 21

Other Experiments

Effectiveness of lemaire Products in Soybean Production .......... Section 22

Potassium Release from Coarse-Textured Feldspathic Soils .......... Section 23

Residual Effects of Etridiazel on a Sharpsburg sicl .......... Section 24

Soil Test Comparison Results for 1984 .......... Section 25

Soybean Variety Evaluation on High pH Soil .......... Section 26

Effect of Etridiazol on Irrigated Corn yields .......... Section 27

Economic and resource analysis of deep tillage to residue soil compaction for soybean production .......... 1

Increasing nitrogen use efficiency by dry land sorghum under conventional disk and no-tillage systems .......... 6

The effect of tillage, residue, precipitation intervals and soil properties on soil crust characteristics .......... 11

Tillage influence on soybean production and soil properties .......... 15

Tillage, rotation and N rate effects on dry land corn production and nitrogen uptake in northeastern Nebraska .......... 18

Soybean Experiments

Effect of potassium salts on chlorosis and yield of soybeans .......... 23

The effect of Fe-EDDHA on soil and plant measurements in control of soybean chlorosis .......... 28

Variety evaluation on high pH soil-1987 .......... 31

Fertilizer Management Experiments

Effect of broadcast phosphorus on P response of ridge planted corn .......... 52

Effect of method and rate of P application on wheat yield and P uptake .......... 54

Effect of Nitrogen rate, application timing and mefluidide application on Bromegrass yield .......... 56

Effect of N source and rate on wheat yield .......... 59

Effect of phosphorus application rate and method on soybean yield .......... 60

Effect of phosphorus application method and rate on irrigated corn yields and soil phosphorus levels .......... 62

Effect of planting date, seeding rate and phosphorus application rate on the yield and yield components of winter wheat in southeast Nebraska .......... 66

Effect of time of seeding, method and rate of P application on winter wheat yield, P uptake, and yield components .......... 69

Evaluation of the influence of starter fertilizer on corn, grain sorghum, and soybeans, 1987 .......... 73

Long term effects of N-Serve on improving nitrogen use efficiency for furrow irrigated corn .......... 77

Nitrogen fertilization of Smooth Brome .......... 79

Phosphorus placement for grain sorghum .......... 81

Progress report on the B-K-R demonstration farm .......... 89

Other Experiments

Dynamics of water in rigid and swelling soils .......... 95

High yield corn-soy bean-wheat rotation study .......... 96

Influence of landscape position on crop production and profitability .......... 102

Microbial activity and available soil N as regulated by soil water filled pore space .......... 105

Precipitation probability modelling .......... 109

An Economic and resource analysis of deep tillage to reduce soil compaction for crop production .......... 1

Effect of phosphorus rate, method of application and tillage on soybean yield in Nebraska .......... 7

Increasing nitrogen use efficiency by dryland sorghum under conventional disk and no-tillage systems .......... 13

Nitrogen placement evaluation for winter wheat in three fallow tillage systems ....... 19

On the infiltration characteristics between tillage/residue soil condition and rainfall .......... 24

Tillage influence on soybean production .......... 26

Tillage, rotation and N effects on dryland corn production and nitrogen uptake in Northeastern Nebraska .......... 30

Fertilizer Management Experiments

Comparison of laboratory procedures for determination of potentially mineralizable nitrogen .......... 37

Effect of broadcast phosphorus on P response of ridge-planted corn .......... 41

Effect of date of planting on method of P performance for winter wheat .......... 44

Effects of P fertilizer dilution in knifed bands on winter wheat yield and root growth .................... 46

Evaluation of the influence of starter fertilizer on corn, grain sorghum, and soybeans, 1988 ............ 52

Influence of N-Serve on nitrogen management and crop response .................. 56

Managing nitrogen more effectively for reduced costs and environmental hazards ............................. 60

Nitrogen fertilization of smooth brome .................. 64

Phosphorus placement for grain sorghum .................. 66

Residual effects of treatments applied to the Soil Test Lab Comparison Study ............................. 69

1988 Progress report on the B-K-R demonstration farm .... 72

Other Experiments

Dynamics of water in rigid and swelling soils ........... 81

High yield corn-soybean-wheat rotation study ............ 82

Residual Effects of Nitrification Inhibitor for Irrigated Corn ........... Section 1

High Yield Corn-Soybeans-Wheat Rotation Study ........... Section 2

Influence of Interseeded Alfalfa or Rye in Irrigated Corn Production ........... Section 3

Maximizing Fertilizer N and Water Use Efficiency on Irrigated and Rainfed Corn ........... Section 4

Placement of N and P Fertilizers for Minimum Till corn under Sprinkler Irrigation ........... Section 5

Wheat Experiments

Increasing Fertilizer P and N Efficiency on Winter Wheat and Corn ........... Section 6

Phosphorus Rate and Method of Application on Winter Wheat in Southeast Nebraska ........... Section 7

Soybean Experiments

Lime-Induced Chlorosis in Soybeans ........... Section 8

Efficient Nitrogen Use Following Soybeans in Rotation ........... Section 9

Soybean Variety Evaluation on High pH Soil ........... Section 10

Other Experiments

Comparison of Lime Requirement Methods ........... Section 11

Deep Soil Sampling for N Recommendations ........... Section 12

Hairy Vetch as a Winter Cover Crop ........... Section 13

Properties and Classifications of Soils Containing Volcanic Ash in Western Nebraska ........... Section 14

Soil Moisture Sensor Based on Soil Dielectric Constant ........... Section 15

Soil Test Comparison Results for 1983 ........... Section 16