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采用微区试验方法,初步探讨了新型脲酶抑制剂LNS及其与硝化抑制剂双氰胺(DCD)配合施用对菜田土壤尿素氮转化和蔬菜生长的影响。结果表明,LNS对土壤脲酶活性可以起到一定的抑制作用,从而延迟尿素N在土壤中的水解和NH4+-N的释放高峰期,其发挥作用的时间大约在施用后前10天。LNS与DCD配合施用则能显著抑制尿素水解后NH4+的氧化作用,使蔬菜整个生长期内的NO3--N含量维持在较低水平。抑制剂的施用对芹菜产量虽然没有产生显著影响,但可以降低其体内硝酸盐含量,并提高芹菜干物质含量。
Using the micro-zone test method, the effects of a new urease inhibitor LNS and its combination with the nitrification inhibitor DCD on soil urea nitrogen transformation and vegetable growth were discussed. The results showed that LNS could inhibit soil urease activity to a certain degree, which delayed the hydrolysis of urea N in soil and the release peak of NH4 + -N. The time was about 10 days before application. The combination of LNS and DCD can significantly inhibit the oxidation of NH4 + after urea hydrolysis and keep the content of NO3 - N in vegetable during the whole growing period at a low level. Inhibitor application did not have a significant impact on celery yield, but could reduce nitrate content in the body and increase celery dry matter content.