Abstract
A phenomenological model was developed to describe yield distribution over the season and seasonal yield as related to irrigation, nitrogen level and harvest interval. A Gaussian environmental function and a quadratic intrinsic growth function were combined to form a differential equation for overall growth rate as a function of time. Integration produced an analytical function which described dry matter as a function of time between harvests and of yield at each harvest. The model contained four parameters which were evaluated for a field study. The model predicted a Gaussian yield distribution and linear dependence of seasonal yield on harvest interval, both in agreement with field data. Dependence of parameters on irrigation, nitrogen and harvest interval was discussed.
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