Evaporation losses in irrigation and water requirements of crops . ^ surface evapora-tion. Figure 19 shows theaverage monthly lossesby evaporation fromthe twenty-two tanks,as well as the amountof water applied eachmonth and the averagemoisture content of thesoil. EVAPORATION FROM POMONA SOILS. On June 20, 1903, three tanks were filled with sandy loam takenfrom a trench in a corner of the substation farm near Pomona, surface soil was irrigated once a month by apphing 2 inchesof water in depth over the surface, and one or two days afterwardsit was cultivated to a depth of a few inches. A
Evaporation losses in irrigation and water requirements of crops . ^ surface evapora-tion. Figure 19 shows theaverage monthly lossesby evaporation fromthe twenty-two tanks,as well as the amountof water applied eachmonth and the averagemoisture content of thesoil. EVAPORATION FROM POMONA SOILS. On June 20, 1903, three tanks were filled with sandy loam takenfrom a trench in a corner of the substation farm near Pomona, surface soil was irrigated once a month by apphing 2 inchesof water in depth over the surface, and one or two days afterwardsit was cultivated to a depth of a few inches. A little rain fell inboth August and September. The monthly losses by evaporation. 49 as well as the total loss from June liO to October 24, a period offour months and four days, are given in the followins; table: Evaporation from surface of hare soils at Pomona, June 20 to October 24, 1903. TankNo. Initialweight. Water added. Loss by evaporation. June 20 toJuly 24. July 24 toAug. 24. Aug. 24to Sept. 28. Sept. 28 toOct. 24. June 20 toJuly 24. July 24 toAug. 24. Aug. 24 Sept. 28 toOct. 24. Total. Percent. 8 9 10 Lbs. 3, .5653,7353, ,575 949393 EVAPORATION FROM ORCHARD SOILS. In the sprin<2: of 1!)04 soils were shipped from Fullerton, Red-lands, and Riverside, Cal., to the substation near Pomona for experi-mental purposes. The Fullerton soil was a heavy dark loam, typicalof much of the best walnut lands of Orange County; that fromRiverside was a sandy loam from
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