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Title:Fate and Utilization of Fertilizer in Inbred and Hybrid Corn Production
Author(s):Stevens, William Bart
Doctoral Committee Chair(s):Dissertation Abstracts International, Volume
Department / Program:Agronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Agronomy
Abstract:To evaluate the impact of N rate and crop rotation on uptake of fertilizer N in seed corn production, corn inbred lines were grown in corn-corn and corn-soybean (Glycine max L. Merr.) rotations using N application rates of 0 to 144 lb acre$\sp{-1}$. When corn was the previous crop, seed yield of all increased with increasing N rate in two of three years, with the optimum N rate varying from 68 to 122 lb acre$\sp{-1}$. Optimum N rates were lower (0 to 96 lb acre$\sp{-1}$) following soybean than when following corn, and no N response was observed in 5 of 9 cases. Recovery of fertilizer N by inbred corn plants ranged from 30 to 45% of the amount applied and was higher at lower application rates and when soybean was the previous crop. A N fertilizer recommendation, calculated using a factor of 1.2 lb N per bu of proven yield and a 20 lb-acre$\sp{-1}$ N credit when soybean was the previous crop, provided adequate N for optimum seed production. Loss of fertilizer N ranged from 16% to 32%, with greatest losses occurring with 144 lb N acre$\sp{-1}$ regardless of rotation. Leaching of NO$\sb3$-N was detected when N application rates exceeded recommended values.
Issue Date:1998
Description:114 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998.
Other Identifier(s):(MiAaPQ)AAI9904595
Date Available in IDEALS:2015-09-28
Date Deposited:1998

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