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在室内模拟大田环境中香蕉茎叶堆肥还田对土壤中各形态钾的影响。结果显示:土壤中添加香蕉茎叶腐熟材料能提高土壤的pH值,在0～240mg/kg(以香蕉茎叶中的钾折算每千克土中添加钾的量,下同)添加量下,土壤pH值随添加量的增加而升高,总体维持在6.3～7.0范围内;土壤速效钾的含量也随着堆肥样品添加量的增加而增大。由于堆肥样品中各种物质的影响,土壤速效钾的量高于外源钾添加量和原始土壤中速效钾的量总和,且速效钾增率随堆肥样品添加量的增加而增大。90d后土壤中速效钾增率仍维持在36.83%～137.58%之间。缓效钾的量与速效钾相比,堆肥样品添加量对其在土壤中的含量变化影响不大,在大部分时间内不同堆肥样品添加量下缓效钾的量差异不显著。
Effects of banana stem and leaf composting in field on potassium in different forms in soils. The results showed that the addition of banana stem-leaf composting material could increase the pH value of soil. Under the added amount of 0 ~ 240mg / kg (potassium added per kilogram of soil in banana stem leaf, the same below) The pH value increased with the increase of the added amount, and maintained at 6.3 ~ 7.0 in general. The content of available potassium in the soil also increased with the increase of the compost sample amount. Due to the influence of various substances in the compost samples, the amount of available potassium in soil was higher than the sum of the amount of exogenous potassium and the amount of available potassium in the original soil, and the increase of available potassium increased with the increase of compost samples. After 90 days, the rate of increase of available potassium in soil still maintained between 36.83% ~ 137.58%. Compared with quick-acting potassium, the amount of slow-acting potassium had little effect on the content of compost in soil, but the difference of slow-acting potassium was not significant under most of the composting samples.