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Site conditions of>6.0" are considered to have slight limitations Site conditions of 3.0" to 6.0" are considered to have moderate limitations 13 Site conditions of X3.0" are considered to have severe limitations All site soils have slight limitations. 4 f The volume of liquid agricultural waste application should not exceed the available water capacit of the root zone or the soil moisture deficit at the time of application. Low rates a y applications of liquid agricultural wastes on soil that has low available water capacity or during . periods of high soil moisture deficit can reduce potential for ground water contamination. Similarly, Field CasJacitY is: Jacktone clay 23.00" Madera sandy loam 17.12" Manteca fine sandy loam 16.67" s , Stockton clay 25.08" To find the permanent wilting point, subtract the available water from field capacity. Thus, the permanent wilting point is: Permanent Wilting Point Jacktone clay 14.58" Madera sandy loam 10.72" Manteca fine sandy loam 8.60" z Stockton clay. 16.04" t The values calculated above indicate the unavailable water, which plants cannot extract: To determine the yield threshold, assuming we are growing a crop that is somewhat sensitive water stress and a 40 percent depletion percentage is"selected, then our "allowable depletion"#is 0.4 x "available water" and the "yield threshold" is "field capacity" — "allowable depletion"- Yield Threshold ! Jacktone clay 19.63" i Madera sandy loam 14.56" Manteca fine sandy loam 13.44" Stockton clay 21.46" To avoid yield or harvest quality reductions, the crop should be irrigated before the soil-water content within the 60'inch root depth falls below the Yield Threshold. , Refer to page 22 for Endnotes and Reference Sources ®Western Dairy Design Associates,Inc.2003 } Page 10 1