Beans should be mastered on-demand top dressing, timely top dressing, fertilizer and water in order to adjust the fertilization principle of water. According to the different fertility, different fertilizer requirements of the growing period of the kidney bean and the growing condition of the plants, timely and appropriate follow-up, can not arbitrarily increase the amount of fertilizer. For example, if the soil is fertile, the barren land is used more often; the clay land is applied more often, the sand land is applied in small quantities; the seedling stage is less applied, and the flowering stage and flood season are applied more frequently; the seedling stage is dominated by quick-release fertilizer, and the flower and fruit stage is Organic-inorganic compound fertilizer is the main application. In addition, water and fertilizer are dependent on each other. Each time after top dressing, they must be watered in a timely manner. The combination of water and fertilizer can play a good top dressing effect.
How to apply fertilizer? First, apply a suitable amount of nitrogen fertilizer in the early growth stage. The root-fixing ability of Rhizobium in the bean seedling root was weak, and the application of appropriate amount of nitrogen fertilizer could promote the early emergence of the plant and the growth was robust. However, if the plant grows vigorously, it is necessary to control or not use nitrogen fertilizer to prevent the plants from overgrowing and prolonged vegetative growth, resulting in delayed flowering, fruiting or fruiting delays. The first time the topdressing fertilizer is to be held in the bud stage of the first inflorescence, the application of 10 kg of urea or appropriate amount of manure. When the fruit pod grows to 3-4 cm long, it will start to grow continuously after the fruiting period. According to the situation of different estuaries and plants, it will be topdressed once every 10-20 days. Manure and compound fertilizer should be used alternately. Manure amount is appropriate and compound fertilizer is 10-20 kg/mu. Topdressing is best to be topdressing with water to help dissolve. In the middle of the top dressing, water should be poured once in order to promote photosynthesis and meet the need for rapid growth of soybean meal. In addition to root fertilization, foliar fertilizer can also be used for foliar spray, the effect is also more obvious.
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