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Thesis (M.S.)—University of Nebraska—Lincoln, 1972. Department of Agricultural Engineering.


Copyright 1972, the author. Used by permission.


Center Pivot irrigation systems have proven to be one of the most feasible and practical methods for irrigating sandy soils and rolling land. Because of the machine’s versatility it also has been purchased and installed on many types of soil ranging from sandy to heavy clay soils. The increasing popularity of center pivots on the heavier soils brings out the need for studies of comparison of fertigation versus the conventional sidedress fertilizer methods in field trials.

This particular study was initiated with three purposes in mind: 1) Determine if incremental fertigation using a center pivot sprinkler system is as effective as conventional sidedress fertilizer application for maximum corn yields on a silty clay loam soil; 2) Determine if nitrate leaching is a problem of concern on a silty clay loam soil in both sidedress and fertigation treatments; and 3) Determine where polyphosphate fertilizer moves when applied by fertigation.

Advisor: Paul E. Fischbach