maximum likelihood. Optimal levels of nitrogen were lower than recommended levels. …

to determine the effects of nitrogen and phosphorus fertilizers on feedstock yield and measures of expected total cost … discrete nitrogen treatments (0 and 134 kg ha-1) and four discrete phosphorus treatments (0, 30, 60 and 90 kg ha-1) were … models were used to estimate the effects of nitrogen, phosphorus and nitrogen by phosphorus interactions on feedstock yield …

. Optimal nitrogen rates are calculated for two yield response functions: linear response plateau and quadratic. Nonstochastic … are small since optimal nitrogen rates do not differ greatly between stochastic and nonstochastic models. …

in a lower average harvestable yield per acre and would require more nitrogen fertilizer, less land for storage, and more …

Soil acidity and cotton yields are influenced by cover crop, nitrogen, and tillage method. Applying half the … recommended lime rate may be possible without reducing cotton yields. Using a nitrogen intensive cover crop and applying less … nitrogen should mitigate the effects on soil acidity and yields. …

Potassium (K) and phosphorus (P) application to sunflower (Helianthus annus L.) reduced cost of production, increased …

agricultural land retirement can reduce most of the phosphorus runoff in the watershed at the lowest cost. Results are robust to …