鄂西低山区的紅黃土,质地粘重板結,肥力很低,历来只种一季中稻。有时冬季种点小春油菜,亩产也仅10斤。1963年冬季由于每亩施了30斤过磷酸鈣,每亩增收油菜子63.8斤。1964年大春种植水稻时,由于磷肥后效,单产由原来的412斤,提高到481斤。1964年又冬种油菜,亩施过磷酸鈣40斤,单产达到152.5斤。不施过磷酸鈣的仅亩产106斤。 The low loess region of western Hubei red loess, texture stick to the board, low fertility, has always been only a season of rice. Spring winter sometimes rapeseed rape, only 10 pounds per mu. In the winter of 1963, 30 kg of superphosphate per mu was applied, yielding 63.8 kg of rapeseed per acre. Spring planting of rice in 1964, due to the effect of phosphate fertilizer, yield from the original 412 pounds, up to 481 pounds. In 1964 winter rapeseed, Mushu over 40 kg of calcium phosphate, yield reached 152.5 pounds. Not apply calcium phosphate only 106 pounds per mu.