夏大豆开花结荚的7、8月份是其产量形成的关键期。但常因下列原因而出现大量落花落荚。①高温,此期出现高温35℃的天气,导致大豆花雄蕊死亡而落花。②干旱,大豆开花结荚期为其一生需水高峰。如测定一株大豆昼夜耗水量在150克左右。此时若发生干旱,开花结荚所需养料就因水分不足无法顺利输导而落花落荚。当土壤相对湿度低于30%时,花荚脱落可达80%,或虽开花时雨水适宜而结荚时干旱也会大量 Summer soybean flowering pods in July and August is the key period of its production. But often due to the following reasons a lot of falling pods. ① high temperature, 35 ℃ during this period of high temperature weather, leading to the death of soybean flower stamens falling. ② drought, soybean flowering pod period of its peak water demand. Such as measuring a day and night water consumption of soybeans in about 150 grams. At this moment, if there is a drought, the nutrients needed for flowering and podding will not drop smoothly because of insufficient moisture. When the soil relative humidity is less than 30%, the flower pods shed up to 80%, or when the flowering when the appropriate rain and pod when the drought will be large