当用水淋洗碱土时,其水浸提液中的钙量恆少于普通土壤中者。水土比例增大时,淋洗出的钙量增多,惟增加量不很大。水土比例增大时,普通土壤各次滤液的pH 值并不增大,且易于达到蒸馏水的pH 值,反之,碱土的pH 值很慢的降低至pH 7.5。浸提液中CO_3~=量逐渐减少,和pH 值的降低相一致,重碳酸盐量开始时逐渐增多,以后又降低。反覆用水淋洗时pH 值亦逐渐降低。 When rinsing alkaline earth with water, the amount of calcium in the water extract is less than that of ordinary soil. When the proportion of water and soil increases, the amount of calcium leached out increases, but the increase is not large. When the ratio of soil to water increases, the pH value of each filtrate in common soil does not increase, and the pH value of distilled water is easily reached. On the contrary, the pH value of alkaline earth is slowly reduced to pH 7.5. The content of CO_3 ~ = in the extract decreased gradually, which was consistent with the decrease of pH. The quantity of bicarbonate gradually increased at the beginning and then decreased. PH value is gradually decreased when rinsed repeatedly with water.