LOSSES OF MOISTURE AND PLANT FOOD BY PERCOLATION. 



25 



TABLE A. 

 Group 1, Sands. 



Group 2, Clays. 



If we assume that all the water precipitated during the quarter 

 either evaporates or percolates during that quarter an assumption 

 which is not true, as some of the water may be stored up, or some stored 

 up may be evaporated the results would be as given in Table A. 



Attention should be directed to the high percentages of water evap- 

 orated, especially during the summer months. This emphasizes the need 

 for storing water in the soil. 



EFFECT OF CULTIVATION UPON EVAPORATION AND PERCOLATION. 



Table No. 8 shows the annual percolation from the soils, uncultivated, 

 and cultivated, to the depth of two or three inches. The cultivation 

 was made every week throughout the year, or, in case a rain intervened, 

 as soon as the soil became in condition suitable for cultivation. 



The soils are divided into the same two groups as in the previous 

 discussion. The average gain in percolation, due to the cultivation to 

 a depth of 2 inches was, with the first group, 3.52 inches, and in the 

 second group, zero. Cultivation to a depth of two inches caused a gain 

 in percolation from all the soils in Group 1. 



TABLE NO. 8. 

 Percolation in Inches from Soils. 



