The vegetable farmers in Yutian County, Tangshan City, have spring planting beans and autumn beans. The cultivation habits of two kinds of beans are used every year. In order to increase the production and increase the income, the vegetable farmers will give the bean to grow fertilizer every season. However, it is sometimes important for growers to apply topdressing properly because of the reduction in production due to improper use of fertilizers.
1. Top dressing principles. In the use of topdressing, it is necessary to grasp the on-demand top dressing, timely dressing, fertilizer and water, and fertilize the principle of fertilization with water. According to different soil fertility, the characteristics of required fertilizers and the growing situation of the plants in different growth stages of the bean, timely and appropriate application, can not increase the amount of topdressing fertilizer arbitrarily. For example, the soil is less fertile, the barren soil is more applied, the clay land is applied more, and the sandy land is a small number of times; the seedling stage is less applied and the flowering stage is applied more frequently; the seedling stage is mainly quick-release fertilizer, and the fruit and fruit stage is organic inorganic. Compound fertilizer is mainly applied. 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.
2. How to apply properly. First, use appropriate 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 first stage of budding, the application of 10 kg of urea or appropriate amount of manure. When the fruit grows to 3-4 cm, it will start to grow continuously after the fruiting period. According to the situation of different cornices and plants, it will be topdressed once every 10-20 days. Manure and compound fertilizer should be used alternately. Appropriate amount of manure, fertilization barrels/mu, compound fertilizer 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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