播期对耐密植大豆品种主要农艺性状及产量的影响

为了研究播期对大豆主要农艺性状及产量的影响，以黑龙江省第三积温带大豆主栽耐密植品种合丰51为试验材料，通过5个播期处理（S1为5月10日，S2为5月20日，S3为5月30日，S4为6月9日， S5为6月19日），研究不同播期条件下大豆主要农艺性状及产量的变化规律。结果表明，随着播期的延迟，株高、主茎节数及百粒重呈逐渐降低的趋势；单株荚数、单株粒数呈先增加后降低趋势；大豆产量随着播期的延迟呈先增加后降低趋势，在S3处理达到最高值，为4214.3kg/hm2。因此，大豆品种合丰51在黑龙江省东部地区的最佳播种时期为5月30日。

Effects of Different Sowing Dates on Main Agronomic Traits and Yield of Close Planting Soybean Cultivars

In order to study the effect of different sowing dates on the main agronomic traits and yield, close planting soybean cultivar‘Hefeng51’, which was planted in the third temperate zone of Heilongjiang Province, was uesd as test material and five sowing date treatments (S1 was May 10th, S2 was May 20th, S3 was May 30th , S4 was June 9th, S5 was June 19th) were set to study the change rule of the main agronomic traits and yield under different sowing dates. The results showed that the plant height, the main stalk pitch number and the hundredgrain weight showed a gradually reducing trend. The number of pods and seeds per plant showed a decreasing trend after the increase. The soybean yield showed a decreasing trend after the increase. The highest yield of 4214.3 kg/hm2 was obtained by S3 treatment. So the best sowing date of‘HeFeng51’was May 30th in the east area of Heilongjiang Province.