Estimation of Yield and Nitrogen Removal by Corn

Abstract

A wide variety of mathematical models have been used to relate crop production to management factors such as applied N and water availability. These include power functions and exponential functions. The objective of this analysis was to use an extended logistic model to relate dry matter yields and plant N removal to applied N for corn (Zea mays L.) for three soils in North Carolina. In this model, response of both dry matter yield and plant N removal to applied N were described by logistic equations. Plant N concentration was then related to applied N by the ratio of these logistic equations. Model parameters were estimated by nonlinear regression. Analysis of variance showed that the N response coefficient c was common for dry matter yield and plant N removal for each soil. Overall correlation coefficients of yield and plant N removal with applied N were very high for all three soils (R> 0.99). It was shown that ≈50% of the total dry matter and 80% of total plant N were contained in the grain at all applied N levels. Maximum potential grain yield of 25.9 Mg ha−1 agreed closely with an estimate in the literature of 26.5 Mg ha−1 (500 bushels acre−1). Dependence of plant N concentration on plant N removal was shown to follow a linear relationship. The present model provides a rational basis for coupling of dry matter yield and plant N removal in response to applied N. It can be used in design and management decisions related to agricultural production and environmental quality.

Growth and nitrogen use efficiency of irrigated maize in a semiarid region as affected by nitrogen fertilization

“…The high initial level of residual NO 3 -N in the spring of 1999 was a carryover from previous years of fertilization and was, at least, partially responsible for the lack of response to applied N. Similarly, Cerrato and Blackmer (1990) and Diez et al (1994) also observed a lack of response caused by a carryover of residual N. Moreover, the high values of total aboveground plant dry matter and grain yield in 1999 can be compared to the maximum yields reported in the literature (Overman et al, 1994). This year the CGR was around 17.1 g m -2 day -1 , exceeding the rates recorded for maize in some previous works (Overman et al, 1994;Uhart and Andrade, 1995). Total dry matter and grain yield were increased by N rates up to 150 and 300 kg ha -1 in 2000 and 2001, respectively.…”

Model for accumulation of dry matter and plant nutrients by corn

“…Cerrato and Blackmer (1990) compared various models (including power functions, linear-plateau, and the Mitscherlich exponential function) which describe response of corn yield to applied N. Parsons et al (1995) reported simulation results with the EPIC model for corn grain in response to applications of fertilizer and animal waste. Overman et al (1994) used an expanded logistic model for this purpose. Overman et al (1995) developed a simplified model using the probability function to simulate growth curves.…”

Model Analysis for Response of Dwarf Elephantgrass to Applied Nitrogen and Rainfall

“…[1] It was shown to apply to the annual crop corn (Zea mays L.) by Overman et al [2] In the present analysis, the focus was on response of the bunchgrass dwarf elephantgrass (Pennisetum purpureum L. [1] It was shown to apply to the annual crop corn (Zea mays L.) by Overman et al [2] In the present analysis, the focus was on response of the bunchgrass dwarf elephantgrass (Pennisetum purpureum L.…”