Fertilizer consumption and productivity of oranges in Sao Paulo over the decades from 1970, 1980 and 1990.

摘要

This study outlines the fertilizer consumed by Sao Paulo's citrus industry in the 70's, 80's and 90's. It developed models to estimate fertilizer consumption related to orange trees yields. Finally, it developed a model to estimate an orange tree yield (boxes/tree) in relation to grove age from stochastic yields values estimated to each tree age. The models were well adjusted and meeting all econometrics requisites.