渝西地区再生稻高产品种筛选及株型特征分析

结合重庆渝西地区再生稻高产品种筛选对13个杂交水稻品种成熟期株型性状进行了调查分析,希望为该地区再生稻品种选择和选育提供依据.结果表明,深两优5814,川香优178两季综合产量分别达到14 513.25kg/hm~2和14 283.75kg/hm~2,较对照增产19.76%和17.87%,再生力强、产量高、品质优,适宜在该地区推广应用.成熟期株型分析结果显示,13个杂交水稻品种株高为101.50~126.00cm,剑叶长和宽分别为23.43~40.61cm和1.72~2.16cm,剑叶叶基角为12.00°~23.75°.成熟期上三叶直立,特别是剑叶挺直有利于改善群体结构和再生芽萌发成穗.

Screening Test on Ratoon Rice Variety and Plant-Type Characteristics Analysis in Yuxi Valley

The purpose of this research is to screen out elite ratoon rice varieties with high yielding to meet needs of local farmers and rice breeder.Thirteen rice varieties have been tested in field to compare the yield and analysis plant-type characteristics.The yields of Shenliangyou 5814 and Chuanxiangyou 178 are14 513.25 and 14 283.75 kg/ha, showing significant increase of 19.76%and 17.87%, respectively.Shenliangyou 5814 and Chuanxiangyou 178 have displayed the best comprehensive performance the former could be used as ratoon rice varieties.The results show that, as for 13 hybrid rice varieties, the plant height was101.50-126.00 cm, the flag leaf length is between 23.43-40.61 cm, the flag leaf width was 1.72-2.16 cm, the leaf basic angle of flag leaf is 12.00-23.75.In addition, the correlation analysis indicates that the rating rice yield had negative correlation with length width and leaf basic angle of the top-most three leaves.Top-most three leaves keeping upright posture in middle rice mature period, especially the flag leaf, are better to improve the population structure and germination of ratooning buds.