Abstract
ABSTRACT ACCUMULATION of dry matter over the growing season of coastal bermudagrass follows a sigmoid distribution described by the error function. The model contains three parameters, viz. total seasonal yield, mean time and time spread. The 2nd order Newton-Raphson method proved very efficient for parameter optimization. Calibration was carried out for data from Watkinsville, GA. Experimental treatments included irrigation status, nitrogen level and harvest interval. The model described the data rather closely. Output includes harvest and seasonal yields and nitrogen accumulation. The empirical model provides a simple tool for analysis of data as related to treatment factors. It should also provide guidance in development of more comprehensive simulation models.
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