Pear trees generally have three nutrition stages: storage nutrition stage, current nutrition stage and storage nutrition stage. It is very important to guide pear production according to these three nutritional stages. Utilization and storage in nutrition stage. After spring, when the local temperature rises to 5-6℃, the roots begin to move. When the temperature reaches about 1 1℃, the sap begins to flow. Buds germinate first, and leaf buds germinate again. This means that buds consume nutrients first. The stored nutrients are used the most, and then 60% of the stored nutrients will be consumed by the development of mosaic disease. If stored adequately, flowers and leaves will grow synchronously. However, due to the influence of climate and management level, buds germinate first, then leaves germinate, and new shoots grow faster after young fruits set. The results showed that the distribution center of nutrients changed from reproductive growth to vegetative growth, and the growth of new shoots accelerated.

The importance of nutrition before flowering. Before flowering, it is a supplement to the nutrients stored in the previous year. It is to supplement organic nutrition instead of inorganic nutrition, because inorganic nutrition can not be absorbed and utilized by trees for the time being without the participation of leaf photosynthesis. Topdressing should be carried out before flowering 15-20 days to supplement nutrients, and the effect is the best. According to the underground humidity, it can be sprayed or added with water. Is the combination of water and fertilizer what people often say? Have enough to eat and drink, ready to blossom? . Nutrition before flowering should not be too early or too late. The ground temperature is too early, and the roots and juice have not yet flowed out. It is no good to bloom too late.

Pay attention to supplement nutrition before flowering, only organic nutrition can be supplemented. After mid-May, the leaves can carry out photosynthesis, and these fertilizer effects can be exerted. It is effective for flowering and young fruit cells in young fruit period. Division of labor basically has nothing to do with it. In addition, the middle and late May is the period when the growth of spring bamboo shoots stops slowly. Buds began to differentiate. Rich nutrition is extremely unfavorable to bud differentiation. It may also lead to imbalance between nutritional growth and reproductive life, and may also lead to secondary fruit drop.

Use the annual nutrition stage. Entering the middle of May is the period of nutrient transformation. The more nutrients are supplied to the pulp, the faster the pulp cells expand, and the fruit will be produced. This excellent quality laid a solid foundation and accelerated the lignification of new buds. The better the maturity of new buds, the better the differentiation of flower buds and the higher the quality. It has laid a good foundation for high quality, stable yield and high yield next year. From August to September, after the fruit is harvested, it gradually enters the transitional stage of storage and nutrition. At this time, the autumn shoots basically stopped growing and the flower bud differentiation was further completed. Storage nutrition stage. From late August to September, it enters autumn. The leaves are functional, the temperature is suitable, and there is a lot of rain. It is also the third growth peak of root system. By applying base fertilizer, a large amount of organic fertilizer, a small amount of compound fertilizer, medium and trace elements or soil conditioners in autumn, furrowing and applying them into the soil. Combined with rainless irrigation, fertilizer can be fully decomposed, absorbed and stored by trees for pear trees to blossom and grow in the coming year.