不同水肥调控模式对稻田土壤氮磷肥力的影响试验

Effects of Different Water and Fertilizer Application on Paddy Soil N and P Fertility

选取湖北省漳河灌区,开展了不同水肥调控模式下稻田土壤氮磷肥力影响试验,分析了2种灌溉方式、3种施氮方式互作条件下稻田土壤氮、磷含量的变化及其显著性测验(a=0.05)。结果表明,间歇灌溉能较好维持稻田耕作上层(0～20cm)土壤全氮、全磷含量,对耕作下层(20～40cm)土壤全氮、全磷的维持和促进较差;淹灌对稻田下层(20～40cm)土壤全磷含量的促进和恢复作用显著。相比不施氮肥处理,4次施氮肥处理对稻田上层(0～20cm)土壤硝态氮维持和恢复作用显著、对下层(20～40cm)铵态氮具有显著的消耗;4次施氮肥、2次施氮肥处理引起稻田上层(0～20cm)土壤全磷含量的差异较显著。

Based on the paddy soil productivity on nitrogen and phosphorus,experiment was carried out under different water and fertilizer application in ZIS,Hubei province.The content change of nitrogen and phosphorus of paddy soil under 2 irrigation models combined with 3 nitrogen application had been analyzed,the same as that of its significance test（significance level a=0.05）.The result showed that the conservation of total nitrogen,total phosphorus content at upper layer（0～20 cm） of paddy soil under alternate wet and dry irrigation（AWD） was better than that at lower layer（20～40 cm）.The promotion and recovery of total phosphorus content at lower layer（20～40 cm） of paddy soil under flood irrigation was significant.Compared with no N treatment,the 4 times N treatment could promote the development and conservation of nitrate nitrogen at upper layer（0～20 cm） obviously,and cut down the content of ammonium nitrogen at the lower layer（20～40 cm） significantly.There was significant difference relatively between total phosphorus content at upper layer（0～20 cm） of paddy soil caused by 4 times N and 2 times N treatments.