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This week, We found the MAD algorithm.

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M.A.D means how much percentage soil can dry while growing crops as Management Allowed Depletion. If the crop can grown at 70% of soil moisture, then MAD is 30%.

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Using M.A.D, we can get irrigation set time depending on Flow rates of sprinkler(gph), Net irrigation (%), Gross Application(%).

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Net irrigation means how much percent soil can intake water depending soil texture like clay, sand, loam...etc.

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Gross Application means how much percent soil can intake water given by application.

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We can get Gross Application(inches) : Net irrigation(inches) / Application efficiency(%, no unit) , where application efficiency means how much percent the application can make the soil wet,for example, furrow is 70~85% and drip or micro sprayer is 80~90%.

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Therefore we use micro sprayer for application efficiency.

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Then, We can get Irrigation Set Time (hr)

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T=(GA x A)/(1.6 x Q)

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where : T = Set Time, hours

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GA= Gross Application, inches

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A = Area, square feet (plant spacing x row spacing)

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Q = Flow Rate per plant, gallons per hour (Multiply emitter flow rate by number of emitters per plant)

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1.6 – Conversion Factor

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