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| From flowering to fill, soybeans will use about .20-.25" of water per day. Of-course this will depend upon weather conditions (sun, wind, temp.). If the beans are fully canopied, most all the water used will be through the plant and not much through evaporation. Sounds to me like a half inch a week might be a bit short.
A google search varified the above with this from Mississippi study....
Water use, or evapotranspiration, is controlled by the plant size, the soil water, soil surface conditions, and the surrounding atmosphere. Evapotranspiration is a combination of evaporation from the soil surface and transpiration from the plant. Early in the season, water use is low by the plant but evaporation is potentially high from an unshaded soil surface (if the surface is wet). After the plants form a complete canopy, most of the water loss is through the plant. This is called transpiration.
Generally, you can expect the soybean crop to use about 0.2 to 0.25 inch of water per acre per day during peak demand. Peak water use begins at flowering and lasts through the pod-filling stage.
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Irrigating soybean questions
