Effects of Nitrogen and Potassium Fertilizer Interaction on Yield and Radiation Use Efficiency of Hybrid Rice
Field experiments with two hybrid rice variety(Y-Liangyou 900 and Quanyouhuazhan),three N applications(90,120 and 180 kg N/ha)and three K applications(120,160 and 210 kg K/ha)were conducted in clarify the effects of nitrogen(N)and potassium(K)fertilizer interaction on grain yield,dry matter accumulation and radiation use efficiency of hybrid rice.The main results showed that the grain yields were significantly affected by N and K fertilizer interaction effects.The highest yield of Y-Liangyou 900 and Quanyouhuazhan were achieved under N2K3 and N3K3 treatments,which were 9.33 and 9.66 t/ha,respectively.Analysis of yield components showed that under low nitrogen level,the effects of increased K fertilizer on seed-setting rate was significant,in which K2 increased by 3.2％compared with K1 treatment,K3 increased by 5.6％compared with K1 treatment.The number of spikelets per panicle and seed-setting rate were significantly improved by increasing K fertilizer application at medium and high N levels.In addition,increasing K fertilizer improved dry matter accumulation,canopy light interception percentage(IP),intercepted photosynthetically active radiation(IPAR)and radiation use efficiency(RUE)of Y-Liangyou 900 and Quanyouhuazhan,and correlation analysis showed that IP,IP AR and RUE were positively correlated with yield.Therefore,moderate increasing K with reduced N fertilizer application could improve RUE,increase dry matter accumulation,and then increase seed-setting rate and yield of hybrid rice.
Hybrid RiceYieldNitrogen fertilizerPotassium fertilizerRadiation use efficiency
NETL
NSTL
万方数据
