Fertilizer characteristics
Strawberry has a shallow root system, strong fertilizer demand, large nutrient demand, and excessive or insufficient fertilization will have adverse effects on growth and development, yield and quality. Nitrogen fertilizer can promote the formation of a large number of leaves and stolons, strengthen vegetative growth, increase fruit size, and increase yield. Nitrogen-deficient leaves turn yellow, locally scorched and slightly smaller than normal leaves. Phosphate fertilizer can promote flower bud differentiation and increase fruit setting rate. The appearance of the upper leaves of phosphorus deficiency is purple-red spots, and the flowers and fruits are small. Potassium fertilizer mainly promotes fruit ripening, increases fruit sugar content, and improves fruit quality. The edges of potassium-deficient leaves often appear black, brown and dry, and in severe cases, they become burns, and the old leaves are seriously damaged, and the fruit is light in color and has a poor taste. In addition, strawberries are very sensitive to chlorine, and the use of chlorine-containing fertilizers should be controlled.
Apply sufficient basal fertilizer
Strawberry should be fertilized reasonably during the whole growth period to ensure that the plant grows robustly, and has more flowers, more fruit sets, large fruits and high yield. Before planting, combined with deep ploughing and land preparation, apply sufficient base fertilizer, generally apply 2000~3000 kg of well-decomposed high-quality organic fertilizer and 50~60 kg of potassium sulfate compound fertilizer per mu.
Rational fertilization
In order to meet the demand for various nutrients during the flowering and fruiting period, 10~15 kg of compound fertilizer is generally applied per mu after the strawberry begins to grow and before the flowering period. If the amount of basal fertilizer is sufficient, it can not be applied. During the berry expansion period, about 15 kg of high nitrogen and potassium compound fertilizer can be applied per mu; After a large number of strawberries bear fruit, the nutrients in the plant are lacking, in order to restore the growth of the plant as soon as possible, more new leaves and new roots are formed, and top dressing should be carried out as needed. The specific amount of fertilizer should be determined according to the amount of fruit picked, more fruit picking, more fertilizer, less fruit picking and less fertilizer.
Extra-root spraying
According to the growth of strawberries in the middle and late stages, the method of extra-root topdressing (i.e., foliar spraying) can be used for auxiliary fertilization. Foliar spraying of potassium dihydrogen phosphate or other foliar fertilizer 3~4 times in the middle and late stages of growth can improve the fruit setting rate, improve fruit quality, increase single fruit weight, and prolong the fruiting period. In addition, foliar fertilizer spraying should be carried out in the evening on cloudy or sunny days, because the evaporation at noon is large, which is easy to cause strawberry fertilizer damage.
The characteristics of strawberry fertilization in early summer are introduced here, I hope it will be helpful to you. If you want to buy high-quality and high-yield garlic seeds, you can download the seed bank App, and the country's excellent garlic varieties are available for everyone to choose.