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本文应用压力板测水装置测定了不同用量的6种化肥在3种土壤上对持水量及水势的影响,结果表明:1.化肥作为土壤溶液中的一种溶质,对土壤持水量有明显影响。施化肥后溶质持水量(Y)随土壤水势增高而逐渐降低,呈Y=A·e~(BX),极显著相关。对不同土壤的影响顺序为中壤>砂壤>细砂;2.不同水势下不同化肥溶质持水量比对照的增幅(△Y)随土壤水势的增高而增大,呈△Y=A·X~B,极显著相关,对不同土壤的影响顺序为细砂>砂壤>中壤;3.不同化肥在不同水势下溶质持水量比对照增幅有随施肥量增加而升高的趋势;4.当不同化肥与对照处理的土壤持水量相等时,不同化肥的溶质持水量(Y)随土壤水势的增高而增加,呈Y=A·X~B,极显著相关;5.不同水势下不同化肥溶质持水量比埘照增幅大体上与化肥的盐指数值呈线性正相关;而施不同化肥的溶质势增量亦随盐指数值的增高而增大,呈极显著指数相关。
In this paper, the effects of six chemical fertilizers with different dosages on water holding capacity and water potential in three kinds of soils were measured by pressure plate measuring device. The results showed that: 1. As a solute in soil solution, chemical fertilizers had a significant effect on soil water holding capacity . After fertilization, the solute holding capacity (Y) decreased with the increase of soil water potential, showing a significant correlation with Y = A · e ~ (BX). The order of influence on different soils was medium soil> sandy soil> fine sand; 2. The increase of water holding capacity of different chemical fertilizers under different water potentials (△ Y) increased with the increase of soil water potential, showing △ Y = A · X ~ B, extremely significant correlation, the order of influence on different soils is fine sand> sandy soil> mid-soil; 3. The solute water holding capacity of different chemical fertilizers under different water potential tends to increase with the increase of fertilizer application.4. When the water holding capacity of different fertilizers and the control was equal, the solute holding capacity (Y) of different chemical fertilizers increased with the increase of soil water potential, showing a significant correlation of Y = A · X ~ B. 5. Under different water potentials, different fertilizers The increase of solute holding water ratio was basically linearly correlated with the salt index of fertilizers. The increase of solute potentials of different chemical fertilizers also increased with the increase of salt index, showing a very significant exponential correlation.