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通过设施栽培实验,研究了膨胀珍珠岩的施入(4m3/亩)对两次种植土壤(一茬和二茬)中碱解氮有效磷速效钾含量变化及分布规律。结果表明:膨胀珍珠岩的施入有效提高了设施土壤中有效养分的含量;其中碱解氮含量可提高14.5%～49.7%,有效磷可提高12.8%～113.3%,速效钾可提高1.3%～25.1%。膨胀珍珠岩施入后第二次种植土壤中,表层土壤的有效养分含量明显低于对照区和珍珠岩施入后的第一次种植土壤,而耕层土壤中的养分含量高于第一次种植土壤及对照区;其中表层中碱解氮的含量比第一次种植土壤降低了34.5%,而耕层中含量却提高了10.5%～13.0%;有效磷含量在表层中降低了42.8%,而耕层中提高了35.0%;表层中的速效钾含量变化不明显,但耕层中速效钾含量由第一次的增加量1.3%～16.3%提高到14.6%～25.1%。
Through the cultivation experiment, the change and distribution of available potassium in available phosphorus from two permulated soils (one stubble and two stubble plants) were studied. The results showed that the application of expanded perlite effectively increased the content of available nutrients in the facility soils. The contents of available nitrogen increased by 14.5% -49.7%, available phosphorus increased by 12.8% -113.3%, available potassium increased by 1.3% ~ 25.1%. The content of available nutrients in the surface soils was significantly lower than that in the control area and the first planting after perlite was applied in the second planting soil after the infiltration of expanded perlite, while the nutrient content in the topsoil was higher than that in the first time Planting soil and control area. Among them, the content of alkaline nitrogen in surface layer decreased by 34.5% compared with the first planting soil, while the content in top layer increased by 10.5% ~ 13.0%; the available phosphorus content decreased by 42.8% in the surface layer, While the topsoil increased by 35.0%. The content of available potassium in the top layer did not change obviously. However, the available potassium in the topsoil increased from 1.3% ~ 16.3% to 14.6% ~ 25.1% in the top layer.