Model analysis of response of Pensacola bahiagrass to applied nitrogen, phosphorus, and potassium. I. Seasonal dry matter

Forage production is influenced by such factors as applied nutrients, water availability, and harvest interval (for perennials). Logistic models have been developed for response to single and multiple elements such as nitrogen (N), phosphorus (P), and potassium (K). This analysis focuses on response of Pensacola bahiagrass (Paspalum notatuni Flugge) to applied N, P, and K. The multiple logistic model is shown to describe the data rather well. A step-wise procedure is outlined for parameter evaluation. It appears that the model is relatively free of bias. It is concluded that a factorial design of N x P x K = 3 x 3 x 3 is the minimum number of treatments required for the analysis. Plant nutrient uptake data would also enhance the value of the results.