. Soil physics and management. Fig. 167.—Nine-year average yield bushels per Fig. 169.—Nine-year average j-ield bushels per acre. 352 SOIL PHYSICS AND MANAGEMENT average. It is without doubt true tliat if the ground is plowed to adepth of six or seven inches, and a good seed bed produced, thereis very little necessity for cultivation of corn on silt loams andsandy loams to conserve moisture. It will be seen from the following-table that during the dry yearg of 1911, 1913, and 1914 the yield ofcorn on the uncultivated plots was 5 to 10 bushels more than onthe corresponding culti
. Soil physics and management. Fig. 167.—Nine-year average yield bushels per Fig. 169.—Nine-year average j-ield bushels per acre. 352 SOIL PHYSICS AND MANAGEMENT average. It is without doubt true tliat if the ground is plowed to adepth of six or seven inches, and a good seed bed produced, thereis very little necessity for cultivation of corn on silt loams andsandy loams to conserve moisture. It will be seen from the following-table that during the dry yearg of 1911, 1913, and 1914 the yield ofcorn on the uncultivated plots was 5 to 10 bushels more than onthe corresponding cultivated ones. The mulch should have had itsgreatest effect during these seasons if it was of much use in con-serving moisture for the crop. Results of Cultivation of Com ^— Each is an Average of Two Plots (Bushels Per Acre) Treatment 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 9-yearaverage Average*per centof No. 5 1. Not plowed nor cul- tivated, weedskept down byscraping with hoe 2. Plowed, seed bed prepared, no cul-tivation, weedskept down byscraping with hoe 3. Plowed, see
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