August 19 – 26 Crop Water Use and Soil Moisture Status Report

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.

August 19 – 26 Crop Water Use and Soil Moisture Status Report
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