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通过淋溶试验,研究了沙质土壤在加入不同施加量和配比的秸秆改良材料后钾素的淋溶状况.结果表明:秸秆改良材料对沙质土壤钾素的淋溶有明显的抑制作用.在一定范围内,施加量大和配方中聚丙烯酰胺(PAM)含量高的处理效果最好,添加秸秆∶膨润土∶PAM为900∶100∶30的改良材料(处理T10-3)的土壤钾素累积淋溶量较CK减少了48%.此外,施用秸秆改良材料能有效抑制沙质土壤钾素的垂直迁移,处理T10-3上层土壤中速效钾的含量较CK提高了102%,下层则降低了58%,说明沙质土壤中施用秸秆改良材料具有抗钾素淋失的效应.
The leaching experiment was conducted to study the leaching status of potassium in sandy soil after adding different amount and proportion of straw improving material.The results showed that straw improved material could significantly inhibit the leaching of potassium in sandy soil . Within a certain range, the application amount is large and the treatment with high content of polyacrylamide (PAM) in the formula is the best, and the effect of adding straw: bentonite: soil with improved PAM of 900: 100: 30 (treatment T10-3) The cumulative leaching amount was reduced by 48% compared with CK. In addition, the application of straw improved material could effectively inhibit the vertical migration of potassium in sandy soil, the content of available potassium in the top soil of treatment T10-3 was increased by 102% 58%, indicating that application of straw improved material in sandy soil has anti-potassium leaching effect.