Coupling of dry matter and nitrogen accumulation in ryegrass |
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| Authors: | A R Overman D L Robinson S R Wilkinson |
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| Affiliation: | (1) Agricultural Engineering Department, University of Florida, Gainesville, Florida, USA;(2) Agronomy Department, Louisiana State University, Baton Rouge, Louisiana, USA;(3) Southern Piedmont Conservation Research Center, USDA-ARS, Watkinsville, Georgia, USA |
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| Abstract: | The logistic model has proven very useful in relating dry matter production of warm season perennial forage grasses to applied nitrogen. A recent extension of the model coupled dry matter and plant N accumulation through a common response coefficient c. The objective of this analysis was to apply the extended logistic model to cool season Gulf annual ryegrass (Lolium multiflorum Lam.) and to establish a common response coefficient c between accumulation of dry matter and plant N. Analysis of variance established the validity of this hypothesis. The model accurately described response of dry matter, plant N removal, and plant N concentration to applied N, with an overall correlation coefficient of 0.9954. Furthermore, the model closely described the relationship between yield and plant N removal, as well as between plant N concentration and plant N removal. The logistic equation is well-behaved and simple to use on a pocket calculator. It can be used to estimate yields and plant N removal in evaluation of agricultural production and environmental quality. |
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| Keywords: | annual ryegrass dry matter logistic model nitrogen |
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