. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. 14 BULLETIN 157, U. S. DEPARTMENT OF AGRICULTURE. practically the same on all plats during the fallow season; and (4) that the average percentage of moisture in the fall was lower for the plats subsoiled to a depth of 18 inches than for any of the other plats. These facts are shown graphically in figures 5, 6, and 7. The points thus brought out show that, so far as soil moisture is concerned, there was no advantage in deep plowing or subsoiling, for the moisture content of the plat plowed 5 inches deep
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. 14 BULLETIN 157, U. S. DEPARTMENT OF AGRICULTURE. practically the same on all plats during the fallow season; and (4) that the average percentage of moisture in the fall was lower for the plats subsoiled to a depth of 18 inches than for any of the other plats. These facts are shown graphically in figures 5, 6, and 7. The points thus brought out show that, so far as soil moisture is concerned, there was no advantage in deep plowing or subsoiling, for the moisture content of the plat plowed 5 inches deep (shallow plow- ing) was as high as that of any of the others. So far as the prepara- tion of a seed bed is concerned, however, it was found that in most cases the shallow plowing was less desirable because the stubble was not turned under as well as by the deeper plowing. Because of this the surface of the shallow-plowed plat usually contained much trash, SPP/M6 SAMPL/A/G SUMMERS4MPUA/G P/IU SAMPL/A/G <02/ r L r r4 *° /6 \, % 1 \ w / / \ \ // X \ 1. N^ i \ ,..- 1 N \ - Hi // // 7 / / 2 3 4-56/2 3 <? S 6 / 2 3 f- £TO OePTH W FEET Fig. 6.—Graphs comparing the average percentage of moisture in each of the upper 6 feet of soil at the beginning, in the middle, and at the end of the fallow season, as found in the fall depth-of-plowing tests at the Nephi substation, 1909 to 1912, inclusive. which interfered somewhat with the operation of the drill when the plat was seeded. YIELD OF GRAIN. The annual and average yields of the plats in these tests are pre- sented in Table V and are shown graphically in figure 8. Table V.— Annual and average yields of winter wheat on plats used in the depth-of-. plowing tests at the Nephi substation, 1910 to 1918, inclusive. Subsoiled 18 inches deep Subsoiled 15 inches deep Plowed 10 inches Plowed 5 inches Yield per acre of grain (bushels). 1910 1911 1912 1913 Average. 14. 2S .18 4 13 29 19 6 13 29 21 7 12 27 20
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