播期对夏大豆豫豆25号生长发育及产量构成因素的影响

以农业部农业科技跨越计划核心技术品种豫豆25号为材料，从3月31日至7月30日每逢10播种一期，共13个播期。结果表明：不同播期对大豆生育期及产量构成因素的影响较大，生育期随着播期的推迟而缩短。产量以4月10日播期最高，为4170.0kg/hm2,以7月20日播期最低，为1870.0 kg/hm2。平均日积累量则以正常播期6月10日最高，为32.26kg/hm2.d。构成产量的各因素随着播期的推迟而降低，从而产量也随之降低。

Effect of Planting Period on the Yield of Constituent Element and Growing Development Soybean YudouNo.25

With the YudouNo.25-the breed of science and technology of agriculture across plan core technology as material,from March31 to July30 planting once at intervals of ten day,It has 13 the planting period together .The results showed that difference the planting period has a more effect on the yield of the constituent element and the growth duration, the growth duration cut down with delay of the planting period,every constituent elements of the yield is reduced with the delay of planting period and yield reduced too.The peak of output is April10 for 4170.0kg/hm2, the lowest yield is July20 for 1870.0kg/ hm2. However the highest average day precipitate is June10 of the planting period for 32.26kg/( hm2.d).