2026-09-22T18:35:42Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/87673 2023-07-11 col_2142_5131 col_2142_34137 com_2142_5130 com_2142_34136 com_2142_397

Dissertation Abstracts International, Volume Stevens, William Bart 2015-09-28T16:22:34Z 2015-09-28T16:22:34Z 10000-01-01 1998 1998 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. Made available in DSpace on 2015-09-28T16:22:34Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9904595.pdf: 5237857 bytes, checksum: 20903b73567604f38ab6ca3103f3719c (MD5) Previous issue date: 1998 Embargo set by: Seth Robbins for item 88954 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community indefinitely during batch ingest of legacy ETDs U of I Only 114 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998. http://hdl.handle.net/2142/87673 (MiAaPQ)AAI9904595 eng Agriculture, Agronomy Fate and Utilization of Fertilizer in Inbred and Hybrid Corn Production text Agronomy Agronomy University of Illinois at Urbana-Champaign Dissertation Ph.D.