Calculating Irrigation Dates

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Irrigation can delay crop maturity, so management of water and PGRs late in the season are vital to get a mature crop to harvest.

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Management of water during bloom changes from maintaining water availability for rapid vegetative growth, to maintaining reproductive growth. Growth control can be accomplished by increasing the irrigation interval slightly to increase water stress. It is possible that since water use is greater during bloom, irrigation intervals can remain the same, and water stress level will increase naturally.

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The water budget method is an accurate method of estimating irrigation dates and many state extension services have publications documenting its use. Several of the values needed differ by soil type. You can get the specific water holding capacity, rooting depth, allowable depletion, and daily water use by cotton from your local Farmers Services Agency or the local extension service.

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Calculating Irrigation Dates

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This article is from the Cotton Management Guide, a publication with year-round advice on managing high-yielding cotton. Download the Deltapine Cotton Management Guide now or sign up for new content to be delivered to your email each month.