长期施用有机肥和化肥对菜田土壤锌有效性的影响

菜田土壤肥料定位试验结果表明, 长期施用有机肥和氮肥能够提高土壤有效锌含量,而且随着氮肥用量的增加,土壤中锌有效性增强。无论施有机肥或不施有机肥,磷钾化肥单施或配施对土壤锌有效性都不会产生明显影响。土壤中锌的有效性受多种因素影响,本试验条件下,土壤有效锌含量与土壤全碳、全氮含量均呈极显著的正相关关系,而与土壤pH值之间相关性比较小。

Effect of Long-term Fertilization on the Availability of Zn in Vegetable Soil

Results of a long-term fertilization experiment in Shenyang Agricultural University which started in 1988 to measure soil available Zn and its correlated factors were presented. The Zn availability of vegetable soil might be increased by long-term applying manure and N fertilizer.The contents of available Zn increased with the increment of N. Because N could reduce soil pH and soil acidification was enhanced with the raised N rates. On the other way, long-term applying P and K fertilizers could hardly affect the contents of soil available Zn, but the contents of available Zn of NK treatment ranked the first among various treatments. The relationship between soil available Zn and total C or N was significantly positive correlation at 1% level, respectively. But there was not clear correlation between soil available Zn and pH.