Cultivation management of strawberry field fertilization

Strawberries are perennial herbs that absorb large amounts of nutrients from the soil. Strawberry fertilization should be based on base fertilizer. About 5,000 kg of farmer's fertilizer per mu should be applied. Nitrogen, phosphorus and potassium quick-acting fertilizers should also be applied to meet the normal growth needs of the plants. The effect of nitrogen fertilizer is to promote the formation of a large number of leaves and stolons, strengthen vegetative growth, increase fruit and increase yield; phosphate fertilizer can promote flower bud differentiation and increase fruit set rate; potash fertilizer mainly promotes fruit ripening, increases fruit sugar content and improves fruit quality. Therefore, in the case of insufficient fertilizer application of the base fertilizer, the fertilizer should be supplemented according to the phenological period of the strawberry. Generally, the topdressing should grasp the following periods:

Pre-flowering fertilizer. It is carried out in the early spring after the strawberry begins to grow until before flowering (about mid-March) to meet the needs of flowering for various nutrients. Apply 10 kg of urea per acre, 25 kg of phosphate fertilizer, and cultivate and irrigate after fertilization.

After the fruit fertilizer. After a large number of strawberries, the nutrients in the plant are lacking. In order to restore the plant growth as soon as possible, new leaves and new roots are formed, which creates conditions for flower bud differentiation in autumn. This time, the topdressing should increase potassium fertilizer appropriately. Each mu can be applied with urea and ammonium sulfate 10 to 15 kg, phosphate fertilizer 15 to 20 kg, and potassium chloride 7.5 to 10 kg.

Pregnancy fertilizer. This is done before the flower bud differentiation of strawberry, which guarantees the normal growth and flower bud differentiation of strawberry plants. Mainly applied phosphorus and potassium fertilizer, combined with a small amount of nitrogen fertilizer.

In addition, strawberries can also be topdressed (ie foliar spray). According to the growth of strawberry, urea, potassium dihydrogen phosphate, zinc sulfate, ferrous sulfate, borax, magnesium sulfate and other fertilizers can be used for foliar application of nitrogen, phosphorus, potassium and some trace elements during the period from strawberry bud to flowering. Generally, it is carried out 2 to 3 times. The spraying time should be selected in the evening on a cloudy or sunny day. Because of the high evaporation at noon, the strawberry is easy to cause fat damage. The results showed that spraying 0.3% urea solution during the flower bud differentiation stage and flowering fruit setting period of strawberry could increase the yield by 10%-20%.