施氮量对江汉平原直播粳稻生长和产量的影响

Effects of Nitrogen Application Rate on the Growth and Yield of Direct Seeding Japonica Rice in Jianghan Plain

为了解杂交粳稻在江汉平原的直播生长特性,以3个杂交粳稻为材料,设置3个施氮水平探讨了直播粳稻的生长和产量差异。结果表明:随着施氮量的增加,直播粳稻的生育期不同程度延长;分蘖动态受施氮水平的影响,表现为高峰苗出现时间因施氮量出现不同程度的推后;随着施氮量的增加,直播粳稻的产量总体上呈现增产的趋势,产量差异达极显著水平(P<0.01);不同施氮量下,甬优4949的产量最高,与甬优1540和甬优4149相比,产量差异达极显著水平(P<0.01),甬优1540和甬优4149产量差异不显著。

To study the growth characteristics of direct seeding japonica rice in Jianghan Plain,three hybrid japonica rice varieties were used as experimental materials,and three nitrogen application levels were set to study the growth and yield differences of direct seed japonica rice.The results showed that with the increase of nitrogen application rate,the growth period of direct seeding japonica rice was prolonged to different extents,the tillering dynamics were affected by the nitrogen application level,which showed that the peak seedling emergence time was delayed by different nitrogen application rates;With the increase of nitrogen application rate,the yield of direct seed japonica rice showed a trend of increasing,and the yield difference reached a very significant level(P<0.01).Under different nitrogen application rates,the yield of Yongyou 4949 was the highest,compared with Yongyou 1540 and Yongyou 4149,the yield difference reaches a very significant level(P<0.01),and the difference in yield between Yongyou 1540 and Yongyou 4149 was not significant.