Soils and fertilizers . MOI6t50IL MOI&T 30IL MOIStSOIL Fig. 18. — Tumblers filled with equal quantities of a moist soil and pre-pared for a demonstration of the effectiveness of mulches in the conserva-tion of moisture. Losses of moisture by evaporation are measured by weigh-ing the tumblers. exactly the same amount of moist soil in each of the other tumblersas is used in the shorter one, compacting to within one inch of the the surface of one place one inch of dry clay loam and on theother one inch of dry sand. Weigh the tumblers now fully prepared. Set tumblers in a place of uniform t
Soils and fertilizers . MOI6t50IL MOI&T 30IL MOIStSOIL Fig. 18. — Tumblers filled with equal quantities of a moist soil and pre-pared for a demonstration of the effectiveness of mulches in the conserva-tion of moisture. Losses of moisture by evaporation are measured by weigh-ing the tumblers. exactly the same amount of moist soil in each of the other tumblersas is used in the shorter one, compacting to within one inch of the the surface of one place one inch of dry clay loam and on theother one inch of dry sand. Weigh the tumblers now fully prepared. Set tumblers in a place of uniform temperature and weigh dailyfor a week. The loss of weight each day is moisture. Tabulatedata and draw curves. Explain the significance of the results obtained. -88 SOILS AND FERTILIZERS. Exercise VI. — Loss of water by transpiration. Materials. — Glazed gallon butter jar, oats seed, paraffined paper,thistle tube, coarse sand and heavy balance. Procedure. — FiU a glazed jar with rich soil, first adjusting coarse sand and thistle tube as shown inFig. 19. Moisten soil with water,but not too wet, and plant with oatseed. When seedlings are one weekold, thin to suitable number. Thencover surface of soil with paraf&nedpaper, allowing plants to protrudethrough small holes cut for that pur-pose. Paraffine the paper to side ofjar so that all losses of moisture byevaporation may be soil up to optimum water con-tent and weigh. You are now readyto record losses by transpiration. Weigh jar each week, replacingwater lost through the thistle data and draw curves. Bychanging the jar from sunshine toshade, warm temperature to cold,high humidity to low, etc., the fac-tors influencing transpiration maybe studied. Jars with different crops, different
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