1. The first rapid growth period is about 35 days after peach blossom. The material condition of fruit growth is the nutrients stored in the tree, and the number of fruit solid cells is determined by the nutrients stored in the peach tree. After picking peach trees, it is necessary to prune them in summer and winter to ensure a good harvest plant type, adjust the position, total number and distribution of fruit branches, keep the balance between aboveground and rhizome, the amount of flowers left and plant type, get rid of the difference between tree aging and upgrading and rejuvenation, and improve the utilization rate of stored nutrients. At the same time, moderate thinning of flowers and fruits, reducing unnecessary nutrient consumption, can obviously promote fruit expansion. At the same time, flower thinning can regulate the growth of tree nutrients and reproductive system, promote the growth of new shoots and increase the total number of leaves. At the same time, strengthen the management method of water and fertilizer, and use the assimilation of leaves to promote the expansion of peaches during discoloration.
2. The supervision of the second rapid growth period is related to the final size of the fruit, which is the key period of fruit expansion. The main management method is to adjust the difference between nutrient growth and reproductive system growth, and strengthen the management method of water and fertilizer. For plants with poor plant types, liquid fertilizer should be strengthened to promote prosperity, while for plants with too many plant types, the growth of nutrients can be adjusted by pruning to ensure excellent permeability. The content of potassium in peach fruit is twice that of base fertilizer and three times that of nitrogen, so potassium fertilizer is more critical to the growth of peach. Potassium fertilizer can be applied three weeks before picking, which has a significant effect on promoting fruit expansion and improving quality. Drought will seriously affect fruit expansion in the stage with the highest water demand after fruit expansion period. Generally, water is injected once two weeks before picking to keep the soil water holding capacity at about 40%.
3. The hard-core stage is the period of slow fruit growth and the peak of seed growth. At this time, the demand for phosphorus and potassium fertilizer is relatively large, and it is particularly sensitive to the change of soil water content. At this time, potassium fertilizer should be the dominant fertilizer, phosphorus and base fertilizer should be combined, and should be released before the hard core stage, and 0.3% potassium dihydrogen phosphate 1~2 times should be sprayed at the same time. The hard core stage is particularly sensitive to environmental humidity. Lack of water or too much water will lead to fruit drop, drought or too much irrigation, which are very easy to cause fruit cracking. Water should be poured once before entering the hard core stage. In the hard core, small water should be poured once in case of continuous drought visibility, but it is necessary to ensure that the soil moisture content changes little.