Effects of different seedlings per hill and planting densities on tillering dynamics and yield components of rice cultivar huahang No.31

To obtain the best cultivation method and achieve high and stable yield of rice，super rice huahang No.31 was selected as the experimental material to study the tillering dynamics and yield characteristics under different seedlings per hill（ A）and planting densities（D）. The results showed that under the same conditions of seedlings per hill，the growth and cutting rate of tillers was D1>D2>D3. Under the same conditions of planting densities，the growth and cutting rate of tillers was A6>A4>A2>A1. The effects of seedlings per hill and planting densities on yield of huahang No.31 were significant or very significant . The order of influence effect was A ＞ D ＞ A×D. The treatment A2D2 with 2 seedlings per hill and planting density 2.4×105 collections/hm2 had the highest yield of 6 584.0 kg/hm2. In the actual production，suitable decreasing seedlings per hill and suitable planting density will be helpful to coordinate the relation between groups and individuals，and exert the high yield potential of huahang No.31.