Model analysis of corn response to applied nitrogen and tillage
2003
Overman, A.R. | Brock, K.H.
Crop production depends upon many factors such as level of applied nutrients, available water, stage of growth, crop species, soil type, and harvest interval (for perennials). Mathematical models provide a framework for linking these factors in a quantitative manner. In this article the extended logistic model is used to describe production (dry matter and plant N uptake) of corn (Zea mays L.) in response to applied N and method of tillage (minimal vs. plow). The model provides reasonable description of response curves (yield, plant N uptake, and plant N concentration vs. applied N). It also describes the phase relationships (yield and plant N concentration vs. plant N uptake) predicted by the model. All the difference in response to minimal vs. plow tillage is accounted for in the intercept parameters of the model, which relates to crop response at low levels of applied N. It is concluded that moldboard plowing turns under crop residue which releases nitrogen in the soil for utilization by the succeeding crop. Production at high-applied N is similar for the two methods of tillage.
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