Location 1: 2 miles west of Hooper, rainfed no-till corn after soybeans on Moody Silty Clay Loam soil (about 2.2″ of available water per foot)
August 19 – August 26
Weekly Rainfall & Crop Water Use for August 19 – August 26:
Rainfall = 2.3″
ET Reference Reading = 0.9
Corn Water Use (R5 dent stage, 1/2 milk line) = 0.86″
Soil Water Depleted at Depth (Sensor Reading) on August 26:
1 ft = 0.68″ (78)
2 ft = 0.82″ (95)
3 ft = 0.00″ (20)
Average sensor reading = 65
Total water depleted = 1.50″
Total available soil water for use before crop stress (50% of soil water depleted in top three feet) occurs: 1.80″ or about 15 days from now
Rainfall needed for the crop to reach maturity without stress (60% of soil water depleted in top three feet) occurs: 0.0″
Seasonal Summary (view previous weekly crop water use at NE Ag Water Mgnt Network):
June 10 – August 26 Rainfall: 14.6″
June 10 – August 19 Corn Water Use: 13.0″
Total June 10 – August 26 (Rainfall – Crop Water Use) Surplus: 1.6″
Location 2: 5 miles east of Winslow, irrigated soybeans after corn on Belfore Silty Clay Loam soil (about 2.0″ of available water per foot)
August 19 – August 26
Weekly Rainfall & Crop Water Use for August 19 – August 26:
Rainfall = 3.1″
Irrigation = 0.0″
ET Reference Reading = 0.9
Soybean Water Use (R6 full seed stage) =0.8″
Soil Water Depleted at Depth (Sensor Reading) on August 26:
1 ft = 0.00″ (3)
2 ft = 0.00″ (4)
3 ft = 0.16″ (30)
Average sensor reading = 13
Total water depleted = 0.16″
Total available soil water for use before irrigation should start (trigger point to start pivot is 35% of soil water depleted in the top three feet): 1.94″ or 16 days from now, Sept. 11.
Rainfall plus irrigation needed for the crop to reach maturity without stress (60% of soil water depleted in top three feet) occurs: 0.06″
Seasonal Summary:
June 23 – August 26 Rainfall: 9.1″
June 23 – August 26 Soybean Water Use: 11.0″
June 23 – August 26 Irrigation: 1.6″
Total June 23 – August 26 (Rainfall + Irrigation – Crop Water Use) Deficit: 0.3″
Location 3: 2 miles north of Arlington, irrigated no-till corn after soybeans on Belfore Silty Clay Loam Terrace soil (about 2.0″ of available water per foot)
August 19 – August 26
Weekly Rainfall & Crop Water Use for August 19 – August 26:
Rainfall = 2.3″
Irrigation =0″
ET Reference Reading = 0.8
Corn Water Use (R5 dent stage, 1/4 milkline) = 0.77″
Soil Water Depleted at Depth (Sensor Reading) on August 26:
1 ft = 0.00″ (9)
2 ft = 0.30″ (40)
3 ft = 0.83″ (118)
Average sensor readings = 56
Total water depleted = 1.13″
Total available soil water for use before irrigation should start (trigger point to start pivot is 35% of soil water depleted in the top three feet): 1.1″ or about 10 days from now, Sept. 5.
Rainfall plus irrigation needed for the crop to reach maturity without stress (60% of soil water depleted in top three feet) occurs: 1.3″
Seasonal Summary:
July 1 – August 26 Rainfall: 7.3″
July 1 – August 26 Corn Water Use: 10.5″
Total July 1 – August 26 Irrigation: 2.8″
Total July 1 – August 26 (Rainfall + Irrigation – Crop Water Use) Deficit: 0.4″
Check out the Nebraska Drought Monitor Map too, new map released on Thursdays each week. View crop water use from around Nebraska at the Nebraska Ag Water Mgnt Network.
