Effects of Water Management and Nitrogen Application on Phosphate Absorption and Utilization of Rice

An experiment was carried out to study the effects of water management and nitrogen application on phosphate absorption of rice Liangyou 287 in Poyang lake basin in 2011.The results showed that,under the same amount of phosphorus input conditions,the total phosphorus accumulation increased as nitrogen fertilizer amount increased.The intermittent irrigation methods caused the inhibition of phosphate absorption at the early and middle stages,but promoted phosphate absorption at the late stages.It also improved the transport amount and its proportion of phosphate in stem sheath,and improved the phosphate increment in spike.In the ways of intermittent irrigation or conventional flood irrigation,with 180 kg/hm2 of nitrogen fertilizer,methods of postponing nitrogen application(50% as basal fertilizer,30% as tillering fertilizer,20% as ear fertilizer) improved total phosphorus accumulation and spike phosphorus increment in rice.Among all different treatments of water management and nitrogen application,rice in treatment of W1N2F2(intermittent irrigation,nitrogen fertilizer 180 kg/hm2,postponing nitrogen application of 50% as basal fertilizer,30% as tillering fertilizer,20% as spike fertilizer) had the highest total phosphorus accumulation and yield.It indicated that postponing nitrogen application could promote the phosphorus uptake and utilization for rice.