NEW MEXICO CLIMATE CENTER

New Mexico Crop Information

Pistachio coefficient(k) to calculate evapotranspiration(ET) where Et=k*Eto

Eto = reference evapotranspiration or potential evapotranspiration referenced to grass.

 
Crop Coefficient uses growing degree days (GDD) accumulated from planting based on the averaging method of calculating GDD   The Base Temperature is 60 F and no cutoff temperatures.

The reference for this work is based on  Pistachios crop coefficient using 1999 climate from Wasco California and crop coefficients over time  from Goldhammer Nut grower October 1995 p 12-20