United States Department of Agriculture
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Table 4. Estimated Spring Wheat Yields

With less than 2 inches of seasonal rainfall, spring wheat will fail in most years.

Available Soil Water at Seeding to 4 Feet Bushels per Acre at Growing Season Precipitation of
2 inches 3 inches 4 inches 5 inches 6 inches 7 inches 8 inches 9 inches 10 inches 11 inches 12 inches
1 inch 0 0 9 13 20 22 26 31 35 40 44
2 inches 0 8 13 17 22 26 30 35 39 44 48
3 inches 8 12 17 21 26 30 34 39 43 48 52
4 inches 12 16 21 25 30 34 38 43 47 52 56
5 inches 16 20 25 29 34 38 42 47 51 56 60
6 inches 20 24 29 33 38 42 46 51 55 60 64
7 inches 24 28 33 37 42 46 50 55 59 64 -
8 inches 28 32 37 41 46 50 54 59 63 - -

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