VARIATIONS IN YIELD OF WHEAT AS AFFECTED BY DEPTH OF SOIL

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Abstract
An expt. in the design of a 3 X 8 split-plot randomized block was conducted at Pehpei, Szechuan, to study the effect of depth of soil on yield of wheat. Chungking clay loam (a young neutral purple soil), Kialingkiang very fine sandy loam (a young calcareous alluvial soil), and Tsinyunszu sandy clay loam (a podzolic yellow earth) were used as 3 main treatments. The sub-treatments were afforded by the following 8 levels of soil depth: 10, 15, 20, 30, 40, 50, 70, and 100 cm. From the results obtained during the yrs. 1942-1944, the following conclusions may be drawn: Of the 3 soil types tested, the subsurface soil of the podzolic yellow earth is the least fertile. The 2 young soils are highly productive and were therefore suitable for wheat growth. The effect of depth of soil on yield of wheat was very pronounced for the 2 young soils, deeper soils producing more grain, but was less marked for the podzolic yellow earth. The infertility of the podzolic soil might be a limiting factor for the growth of wheat.

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