施用稻草等有机物料对黄瓜连作土壤速效养分的影响

不同有机物料稻草，猪粪，锯木屑成分不同，入土转化过程不同，对连作土壤速效率养分产生不同的影响，通过培养实验表明猪粪有增加土壤铵态氮，速效磷和速效钾含量，稻草能提高土 速效磷，钾含量，但降低土壤铵态氮的含量；而锯木屑地土壤铵态氮，速效磷速效钾含量的影响不大。

The Effect of the Rice Straw and Other Organic Materials Application on Available Nutrient of the Soil

Different organic materials such as rice straw, wood dust and pi gfeces have different ingredients, which converse in different ways and exert differen t act on available nutrient of continuous cropping soil. The study shows that pi gfeces can increase the content of ammonium nitrogen, phosphorus and potassium i n the soil; rice straw can enhance that of available phosphorus and potassium, b ut decease that of ammonium nitrogen in the soil; wood dust, however, have littl e effect on it.