不同施氮量对寒地水稻稻瘟病的影响

摘要

Field experiments were conducted to investigate the effects of different nitrogen application rates on rice blast incidence of‘Kongyu 131’and‘Kenjiandao No.6’. The results showed that the occurrence of rice blast was related to nitrogen application rate. For ‘Kongyu 131’when nitrogen application rate was 150 kg/hm2 and‘Kenjiandao No.6’when nitrogen application rate was 150-170 kg/hm2 ,leaf blast and panicle blast incidence and disease index was low,the disease developed slowly. The occurrence of rice blast was also related to rice varieties. Leaf blast incidence and disease index of‘Kongyu 131’were higher than those of‘Kenjiandao No.6’,while panicle blast incidence and disease index of‘Kongyu 131’were lower than those of ‘Kenjiandao No.6’. By mastering the nitrogen application rate on‘Kongyu 131’and‘Kenjiandao No.6’,it is helpful to control rice blast and increase rice yield.%田间试验条件下研究了不同施氮量对水稻品种‘空育131’和‘垦鉴稻6号’稻瘟病发病程度的影响。结果表明，稻瘟病的发生程度与施氮量有关，‘空育131’在施氮量为150 kg／hm2时，‘垦鉴稻6号’在施氮量为150～170 kg／hm2时，叶瘟、穗颈瘟的发病率和病情指数低且病情发展进程慢。稻瘟病发生程度与水稻品种有关，‘空育131’的叶瘟发病率、病情指数比‘垦鉴稻6号’高，但‘空育131’的穗颈瘟发病率、病情指数比‘垦鉴稻6号’低。通过掌握‘空育131’和‘垦鉴稻6号’的施氮量，可有效控制稻瘟病，提高水稻产量。