夏大豆开花期追施氮肥后可分别获得增产63％和30％以上的效果。同时,发现不同的品种在增产效果上存在着很大差别,现将概要介绍如下,供参考。试验方法冈山县山阳镇农业试验场,利用原为旱田轮作二年后的水田,于当地播种秋大豆的最晚时期,7月23日用3334颗/亩的密植方法进行试验。试验品种 Summer soybean flowering topdressing nitrogen fertilizer can be obtained after the increase of 63% and 30% of the effect. At the same time, it is found that there are great differences in the yield of different varieties, which are summarized as follows for reference. Test method Shanyang County Agricultural Experiment Station in Okayama County used the paddy field which was originally paddy field rotation for two years and the latest planting season of soybean in the local area. On July 23, the experiment was conducted with 3334 / mu dense planting method. Test variety