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以重庆分布面积较大的沙质土壤——冷沙黄泥为研究对象,将秸秆进行生物预处理后与膨润土、聚丙烯酰胺(PAM)按比例配制成土壤改良材料,采用盆栽土培试验方法,研究了水稻、小麦、玉米和油菜4种秸秆改良材料对冷沙黄泥速效磷含量的影响.结果表明:(1)4种秸秆改良材料均能明显提高冷沙黄泥的速效磷含量,其顺序由高到低为油菜、玉米、水稻和小麦,它们施入土壤后速效磷的平均含量分别增长了约39.4%~55.7%,38.9%~54.8%,34.5%~46.1%和28.1%~42.5%.(2)相同秸秆条件下不同分处理对土壤速效磷的增磷效果有所差异,其中秸秆∶膨润土∶PAM=900∶100∶30的T3处理对提高土壤有效磷含量的效果最好.
Taking sandy soil with large area distributed in Chongqing as cold sand and yellow mud as the research object, the straw was pretreated with biological pretreatment, and bentonite and polyacrylamide (PAM) were proportionally formulated into soil improvement materials. , The effects of four kinds of improved straw, rice, wheat and rapeseed on the content of available phosphorus in cold-yellow soil were studied.The results showed that: (1) Four kinds of straw improved materials could obviously increase the content of available P in cold- The order of rapeseed, maize, rice and wheat increased from about 39.4% to 55.7%, from 38.9% to 54.8%, from 34.5% to 46.1% and from 28.1% 42.5%. (2) The effect of different treatments on soil available phosphorus increased under the same condition of straw. T3 treatment with straw: bentonite: PAM = 900: 100: 30 had the best effect on increasing soil available P .