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Wheat planting date study at Maricopa

Planting at the optimum time is probably the most important cultural practice in producing high small grain yields. Wheat and barley crops that are planted too early or too late have lower yield potential no matter how they are grown after planting. However, small grains are sometimes planted later than optimum when grown in rotation with cotton or vegetables due to harvest timing in these crops. Small grain crops that are planted too early have increased risk of frost damage or experience cooler than optimum temperatures at critical growth stages. Small grains planted too late develop very quickly and experience warmer than optimum temperatures later in the season that can shorten the crop life cycle. Therefore, the general concept in selecting a planting date for small grains is to plant early enough to avoid warm weather near the end of the season and late enough to avoid damaging cold earlier in the season.
For the entire text of "Planting Dates for Small Grains in Arizona" click here pdf

Current Crop Advisories

  • The Small Grains Advisory provides bi-weekly estimates of durum and barley growth stage for two planting dates at 12 AZMET locations from January through May.

Crop Calculators

The Crop Growth Stage and Water Use Calculator is an interactive online tool that provides estimates of crop growth stage, water use, and irrigation dates of wheat and barley using current or long-term average weather data from AZMET weather stations for a planting date specified by the user. Pictures and descriptions of the various growth stages are also provided.