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EFFECT OF DIFFERENT MIXING RATIOS OF PHOSPHORUS FERTILIZER AND SOIL ON SPRING WHEAT YIELD AND PHOSPHORUS UPTAKE
Abstract
A greenhouse experiment was conducted to determine the importance of soil P-fertilizer contact on P uptake of spring wheat as affected by different soils of varying P fixation capacity and to determine whether an optimum soil P-fertilizer ratio exists for different soils. Three P-deficient soils from Nebraska were selected. They were Ulysses sil., Sharpsburg sicl., and Holdrege sil. soils. The soils were expected to rank in their capacity to fix P as the following: Ulysses sil., Sharpsburg sicl., and Holdrege sil. soils. Mixing fertilizer with different soil volumes influenced yield and P uptake of spring wheat grown on the different soils. The highest dry matter production and P uptake was attained when spring wheat was planted in smaller soil mixing ratios especially with SFMR of 2.5. Spring wheat yields and P uptake were increased as mixing ratio decreased. The optimum mixing ratio was found between 1.0 and less than 6.4 percent for the soils expected to be high in P-fixing capacities. Whereas the optimum mixing ratio was found between 2.5 and less than 40 percent for soils expected to be the least in fixing P. However, the results often showed more P uptake with the high P-fixing soils with SFMR of 100 than with a lesser mixing ratio. This increase in P uptake with the 100 percent mixing ratio may have occurred because of increased probability of root-P fertilizer contact. It was concluded that potential exists for increasing P fertilizer efficiency by mixing fertilizer P with varying amounts of soil depending on that soils P fixation characteristics. Such mixing could involve more than one fertilizer band to increase soil fertilizer contact or possibly could involve more complete mixing of broadcast P fertilizer to optimize root fertilizer P contact.
Subject Area
Agronomy
Recommended Citation
ALNUAIMI, NAZAR MUSTAFA, "EFFECT OF DIFFERENT MIXING RATIOS OF PHOSPHORUS FERTILIZER AND SOIL ON SPRING WHEAT YIELD AND PHOSPHORUS UPTAKE" (1982). ETD collection for University of Nebraska-Lincoln. AAI8217509.
https://digitalcommons.unl.edu/dissertations/AAI8217509