The critical period of applying irrigation water to wheat
1927
Kezer, A. | Robertson, D.W.
The time of applying irrigation water is an important factor in spring wheat production. Water applied at "jointing" increases the yield of straw and grain but not the quality of the grain as indicated by bushel weight and weight per 1,000 kernels. When water is applied at "heading" slightly lower yields of grain and straw are obtained than when water is applied at "jointing." But the quality of grain is materially improved as indicated by bushel weight and weight per 1,000 kernels. Irrigation as late as "blossoming" and "filling" has very little effect on yields of grain or straw, but has a marked effect on grain quality as indicated by weight per measured bushel. Late irrigations at "heading," "blossoming," and "filling" have a residual effect on the following crop. Early irrigations at "germination" and "tillering" increase the straw yield to a greater extent than the grain yield but produce a grain of poor quality. Irrigations of small amounts (1 inch) distributed through the growing season give the best results but are impractical. Soil moisture experiments carried out in potometers did not agree with similar experiments carried out under field conditions.
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