摘要
以穗重型水稻品种东农425和穗数型水稻品种东农427为试验材料,通过密度处理构建不同稻作群体,研究寒地粳稻不同稻作群体条件下水稻茎秆各节间长度、株高、穗长、重心高度、各节间茎粗、茎壁厚度、节间基部到穗顶的长度和鲜重的变化及对茎秆基部第1、2、3(N1、N2、N3)节间的抗折力、弯曲力矩和倒伏指数的影响。结果表明:随着插秧密度的增加,水稻的株高增加,重心高度上移,穗长变短,茎粗变细,茎壁厚度变薄;倒伏指数与茎秆第1,2伸长节间长度呈极显著正相关,与基部茎秆粗度、茎壁厚度呈极显著负相关。通过减少第1和第2伸长节间长度,适当增加茎秆粗度、厚度,降低重心高度,增加穗长,可以提高水稻植株的抗倒性。抗倒伏能力品种间存在差异,穗数型水稻品种东农427的抗倒伏能力强于穗重型水稻品种东农425。
This experiment by ear heavy type of grain farmers 425 rice varieties and farmers 427 rice varieties as experimental material, by dealing with building density in different rice groups, the cold to japonica rice in different rice groups conditions, with varieties Dongnong 425 of ear heavy type and Dongnong 427 of ear number type as ma- terials, stem internode length,plant height, spike length, height of center of gravity, the internode stem diameter, stem thickness of cold japonica rice under different planting densities were studied. Results showed that with the increase of planting density, rice plant height increase, the center of gravity rise, spike length become short, stem diameter and stem thickness decrease; Lodging index and stem elongation internode length 1,2 were extremely significant positive correlation, and the basal stem roughness were very significant negative correlation with stem
出处
《作物杂志》
CAS
CSCD
北大核心
2014年第2期101-106,共6页
Crops
基金
科技部科技攻关项目(2011BAD35B02-01)
科技部科技支撑项目(2011BAD16B11)
"十二五"农村领域国家科技计划项目(2013BAD20B04)
关键词
寒地粳稻
插秧密度
倒伏指数
Cold japonica
Planting density
Lodging index
