Suitable fertilizer types
Urea. The 0.2%-0.3% urea solution was sprayed once before flowering, during flowering, and after flowering, which had a good effect on improving fruit set rate. Rare earth. Spraying 500 ppm of rare earth solution before flowering and full flowering can increase the fruit setting rate, but be careful not to mix it with alkaline fertilizers and pesticides. Boron fertilizer. A 0.2%-0.3% borax or 0.1%-0.2% boric acid was sprayed once every 3 weeks during fruit bud enlargement, flowering and flowering, which can increase the fruit setting rate by 15%-40%. Potassium dihydrogen phosphate. Li Shusheng spraying 0.2%-0.3% potassium dihydrogen phosphate solution during flowering can significantly increase the fruit setting rate.
Top dressing considerations
1. Pay attention to climate factors. The optimum temperature for pollination and fertilization of fruit trees is 22°C-25°C. When the temperature is lower than 22°C, the spray should be chosen close to noon. If the temperature is higher than 25°C, it is better to choose spray before 10 o'clock in the morning.
2. Select the best fertilizer for the characteristics of fruit trees. Jujube, hawthorn and small fruit varieties in apple, gibberellin spray flowering, can greatly increase the rate of fruit set. However, if used in Apple's Marshal, Fuji and other large fruit varieties, the effect of gibberellin is not as significant as molybdenum or boron fertilizer.
3. Pay attention to spray concentration. Flowering plants have low fertility, so the spray concentration during flowering is lower than before and after flowering. Especially in high temperature and dry climate conditions, the formulated concentration requirements are accurate, so as to avoid losses, especially the use of plant growth regulators.
4. Note the degree of fat atomization. The higher the degree of atomization of the fertilizer solution, the more uniform the spraying and the better the effect. It is not advisable to use a high-pressure sprayer to prevent the flower from being damaged due to too much pressure.
5. Reasonably mixed spray. Some mineral elements have antagonistic effects, such as nitrogen and potassium, copper, zinc; phosphorus and zinc, iron, copper; potassium and manganese, zinc, calcium, magnesium, etc., these elements are prohibited mixed spray, so as not to affect the effect. Gibberellin, naphthylacetic acid, etc. are acidic regulators, and can not be mixed with alkaline growth regulators or alkaline mineral fertilizers, pesticides, etc., so as not to reduce efficacy or produce phytotoxicity.
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