First, strengthen nutrient management and improve the nutrition level of the tree
1, timely chasing strong flowers and strong fruit fertilizer. Fertilization is carried out after the flower spike skeleton has been formed and before the second physiological fruit drop. The purpose is to timely supplement the nutrients of the tree in the late flowering stage, ensure the nutrients needed for the growth and development of the young fruit, reduce the second physiological fruit drop, and promote the fruit enlargement. Increase the output of the year. For the post-harvest extraction of the autumn shoots, the good results of the mother branch lay the foundation.
2. Fertilize before harvesting. Generally, it is mainly based on quick-acting foliar fertilizer, avoiding the application of late-acting fertilizer or granular fertilizer, which is not conducive to early absorption of fruit trees. The role of this fertilization is to increase the yield and quality and reduce the later fruit drop.
Second, the rational use of plant growth regulators to reduce the drop
1. The auxin content is insufficient, and the base of the fruit stalk forms a separation layer which will cause detachment. Rational use of plant growth regulators can effectively prevent or reduce fruit trees falling and falling. The current production of application of growth regulators and trace elements to prevent the fruit stem from the separation layer has a certain effect. Spraying the growth regulator on the fruit surface and the stalk before the second and third physiological fruit drop can prevent the fruit stem from separating and reducing the fruit drop. Commonly used growth regulators are auxin, gibberellin, ethylene, cytokinin, abscisic acid, alizarin lactone, salicylic acid, lyric acid and polyamines, etc., and are used as plant growth regulators in fruit tree production. The main ones are the first six categories.
2. Use plant growth regulators to improve pollination and fertilization effects and reduce abortion rate. Pollen and fertilized ovary can produce a large amount of auxin, inhibiting the formation of the separation layer. Therefore, how to improve the pollination, fertilization effect, and reduce the abortion rate is an important measure to preserve flowers and preserve fruit.
3, spraying auxin and gibberellin and trace elements to preserve flowers and fruits, improve the fruit set rate. Before the physiological fruit drop and before harvesting, it is the period of the most lack of auxin. Therefore, spraying the growth regulator on the fruit surface and the stalk in the first week before the second fruit drop and one month before the fruit harvesting can prevent the fruit stem from being produced. Separation of layers, reducing fruit drop, promoting fruit coloration, increasing hardness and improving tolerance.
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