不同水势与施磷水平下的旱稻田土壤速效磷变化

Study on Soil P Efficiency in Upland Rice Field under Different Water and Phosphorous Conditions

采用田间试验和室内模拟方法,研究了旱稻生育期内3个施磷水平下2种水势处理的旱稻田土壤速效磷变化。结果表明,供磷水平不同,旱稻生育期内的土壤速效磷含量变化存在较大差异;土壤速效磷含量最大值在旱稻生育期内的出现时机存在明显差异。稻田水分状况对旱稻田土壤磷素的有效性有较大影响;保持较高的稻田水势有利于促进旱稻植株对土壤有效磷的吸收利用;旱稻栽培应在适度保障较高水势的同时,合理协调土壤的磷素营养。

Studies on soil P efficiency were usually concerning about aerobic crop. However, few study was done in upland rice, especially under water saving irrigation condition. In order to study the effect of three P application levels and two water regimes on soil P efficiency in upland rice during the growth duration, experiment was carried out at Huibei experiment station, Henan province in June- October, 2002. We found that soil P efficiency showed its maximum value at different growth period under different P application levels, and effect of water regimes P efficiency depends on P application levels. P application in upland rice should consider field water conditions.