The crop water use estimates are calculated using the weather data from each automated weather station and these numbers are shown on the maps. The crop water use estimates for the ten crops listed below use a reference ET amount (inches of water use per day) calculated with the Jensen-Haise equation. The reference ET amount is adjusted for each crop to produce the estimated crop water use amount.
The crop water use estimates for potato, corn, dry bean, sugarbeet, wheat, barley, sunflower and soybeans are calculated using several emergence dates for North Dakota growing conditions. The emergence date and the date or dates of the water use estimates are shown at the top of each map. The water use estimates for alfalfa and turf grass are calculated assuming they began growing on April 1. When a crop is selected, the first map shown is for the previous day (a complete weather day). In addition, you can select a summary map for the previous 2,3,4,5,7 or 10 days.
Statewide Crop Water Deficit Map
| Crop | Emergence Dates | |||||
|---|---|---|---|---|---|---|
| Potato | May 1 | May 8 | May 15 | May 22 | May 29 | June 5 |
| Corn | May 1 | May 8 | May 15 | May 22 | May 29 | June 5 |
| Dry Beans | May 15 | May 22 | May 29 | June 5 | June 12 | June 19 |
| Wheat | May 1 | May 8 | May 15 | May 22 | May 29 | June 5 |
| Barley | May 1 | May 8 | May 15 | May 22 | May 29 | June 5 |
| Sugarbeets | April 22 | April 29 | May 6 | May 13 | May 20 | May 27 |
| Soy Beans | May 15 | May 22 | May 29 | June 5 | June 12 | June 19 |
| Sunflower | May 15 | May 22 | May 29 | June 5 | June 12 | June 19 |
| Alfalfa | Assumes growth begins in April | |||||
| Turf Grass | ||||||
