Fate and Utilization of Fertilizer in Inbred and Hybrid Corn Production

Stevens, William Bart

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Description

Title

Fate and Utilization of Fertilizer in Inbred and Hybrid Corn Production

Author(s)

Stevens, William Bart

Issue Date

1998

Doctoral Committee Chair(s)

Dissertation Abstracts International, Volume

Department of Study

Agronomy

Discipline

Agronomy

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Agriculture, Agronomy

Language

eng

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.

Graduation Semester

1998

Type of Resource

text

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