The absorption of three elements in the growth process of vines, beans, nitrogen, potassium absorption, phosphorus less attractive. On the other hand, the nodule formation of kidney bean also changes with plant growth. During the period from the start of sowing to the harvesting of pods, nodule formation was rapid, nodules were found in both the main roots and lateral roots, especially in the early stage of flowering and scarring, with large nodule, pinky, and strongest nitrogen fixation ability. On topdressing, apply less before flowering, and apply more after flowering. In the use of nitrogen fertilizer, a small amount of seedlings, vines to the initial flowering amount, but depending on the growth of the plant, growth potential should control the application of nitrogen fertilizer, too much nitrogen fertilizer is likely to cause falling, and delayed scarring. After flowering and podging, nitrogen, phosphorus, and potassium are added, and with careful use, potassium is slightly more than nitrogen, so as to promote the production of assimilation substances, which is favorable for the good development of soybean meal.
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