Corn response to irrigation and applied nitrogen
2002
Overman, A.R. | Scholtz, R.V. III.
Yield of corn (Zea mays L.) is very dependent on water availability and applied nitrogen (N). In this article data from the literature are used to establish dependence of yield upon each of these factors and the two in combination. The three separate studies involved surface irrigation of corn. From the first study an exponential relationship is established between dry matter yields (grain and total) and evapotranspiration (ET). Yield at the highest ET rate was shown to be about 80% of the maximum potential yield for three soils studied. Grain was shown to constitute about 50% of total dry matter at all ET rates. Analysis of data from the second study confirmed the utility of the logistic equation for yield response to applied N. The third study included three irrigation rates and six rates of applied N. Analysis showed that the model could be written as the product of a logistic term for applied N and an exponential term for ET. This represents an improvement over the previous linear model for dependence of yield on water availability.
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