摘要
通过对宁夏灌淤土麦田施磷量的温室模拟试验和大田试验结果表明:施磷量与土壤速效磷增量之间呈直线函数关系;灌淤土对水溶性磷肥的固定率很高;土壤速效磷增量随施磷后的时间大致按指数函数关系衰减。综合优化后,灌淤土麦田可按公式Q=0.32×(15.6-90)×2.29估算土壤需磷量。
The experiments were carried out both in a greenhouse and in fields, in order to determine the quantity of phosphate fertitizer requi-site for wheat field of irrigation-silted soil in Ningxia. The results show that the relationship between the quantity of phosphate fertilizer (P2O5) applied and the increment of rapidly available phosphorus in soil is the straight line function, the percentage of water-soluble phosphate fertilizer fixed by irrigation-silted soil is high; the increment of rapidly available phosphorus in soil decreases with days after applying phosphate fertilizer in accordance with exponential function in general. After comprehensive and optimal treatment?the formula, Q = 0.32x (15.6-po) x2.29, can be used for estimating the quantity of phosphate fertilizer (P2O5) requisite for wheat field of irrigation-silted soil.
出处
《农业科学研究》
1990年第2期41-46,53-98,共9页
Journal of Agricultural Sciences
关键词
土壤速效磷增量
土壤需磷系数
磷肥固定率
磷素“减半期”
土壤肥力指标
the increment of rapidly available phosphorus in soil coefficient of phosphate needful in soil the fixation perc- entage of fertilizera halflife phosphorus index of soil fertility
