Cotton Evapotranspiration for Las Curces NM for 1997

Non-soil moisture stressed evapotranspiration	Arizona model calculated soil moisture stressed evapotranspiration
Evapotranspiration was calculated using a crop coefficient for cotton and potential evapotranspiration from the NWS weather station. Planting date May 1 1997. The growing degree base was used and converted to a time base for display.The evapotranspiration respresents non- soil water stressed conditions.	When irrigating every two to three week , the soil moisture reservoir is depleated and evapotranspiration decreases. The Arizona scheduling model uses climate data to calculate potential evapotranspiration and a growing degree day crop coefficient developed in Arizona for cotton along with a soil moisture stress function to reduce non- stressed evapotranspiration to actual evapotranspiration Accumulative evapotranspiration using the Azmat the arizona model shows a different rate of water use for cotton.

The Arizona model AZMET uses a crop coefficient develped in Arizona that predicts a slower rate of development of cotten compared to the crop coefficient developed in New Mexico. The differences are probable because the cotton research done in Arizona was done in farmers fields and the crop was probably stress after emergence delaying the rate of development. Both evapotranspiration rate are for different varities of acala cotton. The difference in varities may also account for some of the differences.

Evapotranspiration was calculated using a crop coefficient for cotton and potential evapotranspiration from the NWS weather station. Planting date May 1 1997. The growing degree base was used and converted to a time base for display.The evapotranspiration respresents non- soil water stressed conditions.

When irrigating every two to three week , the soil moisture reservoir is depleated and evapotranspiration decreases. The Arizona scheduling model uses climate data to calculate potential evapotranspiration and a growing degree day crop coefficient developed in Arizona for cotton along with a soil moisture stress function to reduce non- stressed evapotranspiration to actual evapotranspiration Accumulative evapotranspiration using the Azmat the arizona model shows a different rate of water use for cotton.