During the visit to the fruit-producing areas, the author found that there are still many unreasonable fertilization methods in the production of fruit farmers. “One shot” is one of them. The so-called fertilization “one shelled blast” refers to applying organic fertilizer and inorganic fertilizer in the autumn and then applying it once to the fruit trees. No fertilizer is applied in other seasons. Why doesn't the fruit tree promote fertilization? This is because this method of fertilization does not meet the annual fertility requirement of fruit trees.

Generally, the north deciduous fruit tree is a crop with a long growth cycle. The absorption of nitrogen, phosphorus and potassium are the main elements. In spring, the absorption of nitrogen is the peak. The fruit expansion after fruit set is before the harvest is potassium. At the peak of absorption, the absorption of phosphorus was relatively flat during the anniversary without apparent peak periods. Just looking at the characteristics of this fertilizer requirement, it is not appropriate to apply the inorganic fertilizer at one time to apply fruit trees once. For example, in the autumn, if nitrogen and potassium fertilizers needed for fruit trees are blended with organic fertilizers once a year, they are applied at one time. This is not the peak absorption of nitrogen and potassium in fruit trees. The applied nitrogen and potassium are for fruit trees. Excessive, inorganic nutrients that cannot be used in fruit trees are bound to be fixed or lost in the soil. In the following year, the peak period of nitrogen requirement or potassium application in fruit trees will be insufficient for nitrogen or potassium. Therefore, this method of fertilization not only causes waste, but also adversely affects the growth of fruit trees. For fruit trees, for every hundred kilograms of fruit produced, there is a scientifically determined proportion of nitrogen, phosphorus, and potassium. According to this ratio, consider the rate of absorption and loss of fertilizer, and it is possible to give a given amount of various inorganic fertilizers. However, this amount of fertilizer is not the amount that is applied to fruit trees at one time, but refers to the amount of fertilizer applied to fruit trees throughout the year. Fertilization of fruit trees should be based on the characteristics of the nutrient requirements of the amount of fertilizer and fruit trees in different periods of the year, and fertilizers of different compositions should be mainly applied in stages. For example, about 60% of the annual nitrogen fertilizer should be applied in the spring and about 80% of the whole year's potassium fertilizer should be applied in the summer. The reason for this kind of fertilization is very simple. It is to look at fruit trees for fertilizer. Only understand the characteristics of the fruit tree fertilizer, whether it is underground fertilization or foliar fertilizer, in order to achieve a small amount of effect and good purpose.

Some fruit growers fertilize the "one bombardment" by confusing the characteristics of organic fertilizers with the characteristics of inorganic fertilizers. Organic fertilizers are generally required to be applied after the fruits are harvested because the organic fertilizer has a relatively long-lasting fertilizer effect. The main purpose of applying the organic fertilizer is to improve the soil growth environment of the fruit trees, so that the root system of fruit trees is developed and the tree vigor is strong, so the organic fertilizer can be used once. Sexually applied. Inorganic fertilizers are characterized by quick and effective fertilizers and short duration, so it is best to apply them in different times according to the requirement of fertilizer requirements in different periods of fruit trees.

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