基于再生稻品种筛选的衡阳稻区不同水稻品种头季稻产量构成差异

Differences of First-season Rice Yield Components of Rice Varieties in Hengyang Rice Region Based on Ratooning Rice Variety Screening

为筛选适宜在衡阳地区栽培的再生稻品种,比较研究了8个不同生育期水稻品种头季稻的产量及其构成因素。结果表明:各品种头季稻产量与干物质量存在明显差异,均表现为Y两优9918>甬优4149>Y两优911>湘早籼45号>恒两优金农丝苗>隆两优1988>两优121>凤两优464;Y两优9918、甬优4149的经济系数较高,湘早籼45号、凤两优464、恒两优金农丝苗的经济系数较低。相关分析结果表明,产量与有效穗数、结实率、千粒质量相关性不大,与每穗总粒数、每穗实粒数呈极显著正相关(相关系数分别为0.9806**和0.9712**),与经济系数呈显著正相关(r=0.7078)。本试验条件下,选择穗粒数较多、经济系数较大的品种易获得高产;从头季稻产量来看,生育期为120~130 d的品种Y两优9918与甬优4149是适合衡阳地区种植的再生稻品种。

In order to screen suitable ratooning rice varieties for Hengyang region,the yield and its components of eight rice varieties with different growth duration were comparatively studied.The results showed that there were significant differences in yield and dry matter weight of different rice varieties,with the trend of Y Liangyou 9918>Yongyou 4149>Y Liangyou 911>Xiangzaoxian 45>Hengliangyoujinnongsimiao>Longliangyou 1988>Liangyou 121>Fengliangyou 464.The harvest index of Y Liangyou 9918 and Yongyou 4149 were higher,and which of Xiangzaoxian 45,Fengliangyou 464 and Hengliangyoujinnongsimiao were lower.Correlation analysis showed that there existed little correlation between yield and the number of effective panicles,seed setting rate and 1000 grain weight,and a very significant positive correlation existed between yield and the total number of grains per panicle and the number of filled grains per panicle(the correlation coefficients were 0.9806**and 0.9712**respectively),and a positive correlation existed between yield and harvest index(r=0.7078).Under the conditions of this experiment,it is easy to obtain high yield by selecting varieties with more grains per panicle and higher harvest index and judging from the yield of main crop of rice,varieties with growth duration of 120-130 d,Y Liangyou 9918 and Yongyou 4149,are more suitable ratooning rice varieties for Hengyang region.