The parameters of yield response functions can vary by year. Past studies usually assume yield functions are nonstochastic or ‘limited’ stochastic. In this study, we estimate rye-ryegrass yield functions where all parameters are random. Optimal nitrogen rates are calculated for two yield...

A variable rate nitrogen applicator based on optical reflectance measurements was developed to increase profits in wheat production by reducing the cost of production or by increasing grain yield. This paper determines if yields and profits from the variable rate treatments are significantly...

Native warm-season grasses (NWSGs) have demonstrated potential to reduce summer forage variability in the region, and there has been growing interest in the use of NWSGs as a lignocellulosic biomass crop. The objectives of this research were to determine if there was a difference in beef yield...

Profit-maximizing nitrogen rates were determined for two bermudagrass hay producers, one who considers nitrate toxicity to cattle and one who does not consider nitrate toxicity. Producing bermudagrass hay with a reduced probability of nitrate toxicity requires a $6.02/ton premium to breakeven...

Irrigation is expensive in Tennessee because of small, irregular fields. We calculated the breakeven corn prices for irrigated corn in Tennessee. Breakeven prices were $4.02-$7.94/bu depending on field size, energy source, and energy price. At current prices, irrigated corn is profitable, but...

Improved software now makes Bayesian estimation a strong alternative to nonlinear maximum likelihood. Bayesian methods were used to estimate a linear response stochastic plateau for cotton and were shown to provide estimates similar to maximum likelihood. Optimal levels of nitrogen were lower...

Wheat regression models that account for the effect of weather are developed to forecast wheat yield and quality. Spatial lag effects are included. Wheat yield, protein, and test weight level are strongly influenced by weather variables. The forecasting power of the yield and protein models was...

Deterministic and stochastic yield response plateau functions were estimated to determine the expected profit-maximizing nitrogen rates, yields, and net returns for corn grown after corn, cotton, and soybeans. The stochastic response functions were more appropriate than their deterministic...