新垦淡灰钙土玉米施磷效应研究

Study on Efficiency Applying Phosphate on Corn in the New Cultivated Gray-Calcium Soil

针对新垦淡灰钙土玉米施磷效应 4年定点试验研究 ,结果表明 :施磷后效明显 ,供磷能力强 ,放磷也快 ,一般持续时间为 3年。要使后季玉米稳产高产 ,建议每三年重施一次磷肥 ,推荐量为 2 3 0～ 3 3 8kg/hm2 为宜 ,也可以在新垦第一年重施 。

Study on efficiency of applying phosphate on corn 4 years' fixing place experiment. Results obtained showed that after fertilization phosphate was obvious and supply phosphate ability was strong as well as setting free phosphate was quick. Sustained time was 3 years. We suggest that a heavy apply phosphate is each 3 years in order to planting corn yield steady high.The proper recommends application P 2O 5 is about 230～338kg/hm 2 .It may be a heavy apply phosphate the first new cultivated year and after that is proper less application each year.