施用有机肥对植烟土壤碱解氮含量的影响

培育试验结果表明:4种植烟土壤在施用5种有机肥后,加还原剂测定的土壤碱解氮(+H)含量变化有持续递增型、抛物线型和直线型三种类型,而不加还原剂测定的土壤碱解氮(-H)含量变化仅有峰值型和持续递减型两种类型;施用等量有机肥,土壤碱解氮(+H)含量大于土壤碱解氮(-H)含量;有机肥氮素最大释放率依次为饼肥>鸡粪>牛粪>稻草>猪粪,且出现在灰砂泥田壤土的频率较高;施用有机肥对土壤碱解氮含量的影响依次为饼肥>鸡粪>牛粪>稻草>猪粪,施用饼肥至培育末期的土壤碱解氮增加量远高于其它有机肥,且碱解氮含量随有机肥用量的增加而提高。

Effects of Organic Manure Application on Content of Available Nitrogen in Tobacco-planting Soil

The effects of five organic manures application on the content of available nitrogen in four kinds of tobacco-planting soils were studied through cultivation experiments.The results showed that after applying organic manures to tobacco-planting soils,there were three types in the change of the available nitrogen content mensurated by adding reducer,including increasing type,parabola type and linear type;but there were only two types in the change of the available nitrogen content mensurated without adding reducer,including peak type and decreasing type.The content of available nitrogen mensurated by adding reducer was higher than that without adding reducer after applying the same rates of organic manures.The largest release rate of nitrogen element in different organic manures revealed the following order: cake manure > chicken manure> cattle manure> straw manure> pig manure,and there was higher release rate of nitrogen in the gray and sand mud fields than in the other fields.The effect of organic manures on the content of available nitrogen in tobacco-planting soil showed the following order: cake fertilizer> chicken manure> cattle manure> straw manure> pig manure,and the content of available nitrogen increased along with the increase of the application rates of organic manures.