Further insight is provided regarding an appropriate model of cropwater
response for continuously growing crops. A dated input.production
function was estimated for pineapple oranges in Florida. Generalized
least squares regression techniques were used to ameliorate the effects
of contemporaneously and serially correlated errors. The continuously
growing citrus crops also lead to :{ac torially determined product ion re-.
lations over time. This causes the economic optimum level of water to
apply in any given time period to be a function of water applied in the
past and expectations for the future