Nitrogen response of no‐till corn in first and second years following conservation reserve program

Autor: Peter C. Scharf, John A. Lory, David B. Quarles
Rok vydání: 2000
Předmět:
Zdroj: Communications in Soil Science and Plant Analysis. 31:2501-2508
ISSN: 1532-2416
0010-3624
DOI: 10.1080/00103620009370604
Popis: A considerable amount of land enrolled in the Conservation Reserve Program (CRP) has been and will be returned to row crop production. It is difficult to predict how to manage nitrogen (N) fertilizer for these row crops, since there are plausible reasons to expect either substantial N immobilization or substantial N mineralization due to the effects of CRP enrollment. Our objective was to characterize corn (Zea mays L.) yield response to N following CRP in order to develop N management recommendations. Corn was planted either directly into killed CRP sod (CRP‐corn) or following soybean [Glycine max (L.) Merr.] that had been planted into killed CRP sod (CRP‐SB‐corn)‐ We applied a range of N rates and determined the economically optimum N rate from the yield response data. In both years of the study, the optimum N rate for CRP‐corn was much higher (181 and 230 lb N acre‐1 in 1996 and 1997, respectively) than theoptimum N rate for CRP‐SB‐corn(108 and 113 lb Nacre‐1 in 1996 and 1997, respectively). C...
Databáze: OpenAIRE
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