半矮秆大豆黑河19号窄行密植研究

1997—1999年三年试验结果表明，半矮秆大豆黑河19号适于窄行密植，与“垅三”栽培相比，生育前期，所有行距密度组合秆强不倒，长势旺，增加了光合面积，改善了光分布，提高了光能利用率，同时增强了群体固氮能力及根群的吸收能力，提高了群体尤其是群体中上冠层的干物质生产能力，但低密度组合不够明显。生育后期，倒伏程度加重，尤其是宽行距高密度组合易产生倒伏，导致群体通风透光不良而减产，低密度组合，虽然群体生育良好，但增产不够明显，其它行距密度组合增产幅度较大，为7．9％—19．7％。在不产生严重倒伏情况下，行距相同，高密度优于低密度，密度相同，窄行距优于宽行距，以15cm行距公顷保苗66．7万株平作窄行密植效果最好。

STUDY ON SOLID SEEDING OF SEMIDWARF SOYBEAN VARIETY HEIHE 19

Results of the experiments from1997-1999 reveal that :Serious falling is a obstacle that yield is increased on semidwarf soybean variety Heihe 19.Compared with Long 3 cultivation earlier stage of its bearing,all combinations about row spacing and density,soybean stalks are not falling,the way of Heihe 19 is growing well,leaf area is increased,light is distributed well,the rat that light energy is utilized is increased,nitrogen-fixing ablitity of colony and absobing ability of root are strengthen,but low density combinations are not clear.Later stage of its bearing,falling become serious ,fallings of the combinations about wide row spacing and high density become more serious,its yield are reduced,the colonies of low density combinations are growing well,but its yield increased are not clear,other combinations yield increased are bigger,its range is 7.9-19.7under this circumstance,same row spacing,high density is better than low,same density ,narrow row spacing is better than wide,the solid seeding that row spacing is 15 cm and density is 667000 plant/hm 2 is best in the experiments.