膨胀珍珠岩对大棚设施土壤养分含量及分布的影响

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%。

Effect of Perlite on Nutrient Contents and Distribution of Soil in Greenhouse

The contents and distribution of available-N, available-P and available-K in the two planting soils(one generation and two generation) with the application of expanded perlite (4m3 / acre) were delermined. The results indicated that the application of expanded perlite effectively improved the content of the effective nutrients in the greenhouse soil. The available N,P and K increased 14.5%-49.7%, 12.8%-113.3%, and 1.3%-25.1%, respectively.When Perlite was applied into the soil, the contents of the effective nutrients in surface soil of the second planting soil were significantly lower than that of control and the first planting soil.. The available N and P contents in surface soil reduced 34.5% and 42.8%. The available-K content in surface soil did not change significantly.