收割黄豆不要连根拔黄豆成熟人们习惯于用连根拔的方式收割，殊不知连根拔不仅把土和杂物混到了豆子堆里，要花劳力清理，而且使黄豆根部的根瘤受到破坏。黄豆的根瘤内含有大量的根瘤菌和剩余的有机氮素。据有关资料介绍，一亩黄豆的根瘤含有的余氮，折算约相当４公斤氮肥... Harvesting soybeans do not uproot the soybeans mature people are used to reap the same way harvest, do not know even the root pull not only the soil and debris mixed into the beans heap, to spend labor to clean up, but also to the roots of soybean roots damaged. Soybean nodules contain a large number of rhizobia and the remaining organic nitrogen. According to the information, nodular soybean nodules contain more nitrogen, converted about 4 kg of nitrogen fertilizer ...