Spraying foliar fertilizer on the fruit tree in time can achieve the purpose of strengthening the tree, resisting disease and high yield. The method is simple and easy, and the effect is obvious. The technical points are as follows:
Suitable period of foliar spraying
Spraying can be applied throughout the growing season, but it is best to spray when the fruit trees most need some kind of fertilizer but are lacking. As far as the types of fertilizers are concerned, the growth period of fruit trees is different, and the demand for fertilizers is also different. From germination, leaf spreading to before and after flowering, nitrogen fertilizer should be sprayed to promote flower bud differentiation and improve fruit setting rate; spraying 0.2% -0.4% boric acid mixed solution at flowering stage can significantly improve fruit setting rate; Spraying 2% ～ 3% of superphosphate soaked filter fluid can increase the sugar content of the fruit; spraying 0.2% ～ 0.3% potassium dihydrogen phosphate solution during the fruit expansion period can significantly promote fruit expansion and improve the quality of the fruit. It can also reduce fruit drop.
The timing and method of foliar fertilizer spraying
The effect of foliar spraying is greatly affected by wind and temperature. Generally, it should be sprayed on a cloudy day without wind. In summer, fertilizer spraying should be carried out before 10 am or after 4 pm.
Fertilizer concentration should be appropriate
When foliar fertilizer is sprayed, different concentrations should be used according to the different growth periods of fruit trees, climatic conditions and tree species. The concentration used for young trees should be low, and the concentration used for mature trees should be high.
Although foliar spraying has many advantages, it can only be used as a supplement to soil fertilization.
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