In May, the young apples began to swell, and pests and diseases entered an outbreak period. It was also a critical period for fertilization, irrigation, and medication. Fruit growers should strengthen management.

Topdressing and irrigation

Fruit swelling requires a certain amount of water and nutrients. Insufficient water and nutrients will affect the development of the fruit, which in turn affects the quality of the fruit and the output of the orchard. Therefore, the fruit grower must apply good fertilizer and irrigate enough water. Fertilizers are mainly sprayed on foliage, and can be sprayed with urea, potassium dihydrogen phosphate, and calcium amino acid solution. For large trees with a lot of fruit or senescent trees, spray twice more. The water was poured in 10 days after the flowers died.

Fruit thinning and summer pruning

The target yield method is adopted for fruit thinning. The high-quality orchard plans to produce 2000-3000 kilograms per mu. For large-scale fruits such as Fuji, 12000-15000 fruits per mu, and small and medium-sized fruits such as Gala, 15000-18000 fruits per mu. About 70 leaves of weak trees leave 1 fruit, and 40-50 leaves of strong trees leave 1 fruit.

The main purpose of summer shears is to control vigorous growth, save nutrients and artificially promote flowers. For the young trees next year, the trees that do not bear fruit for years, and the prosperous trees, they will naturally not form flower buds, so artificial flower promotion is required. The end of May and the beginning of June are the critical period for apple tree flower bud differentiation, and it is also a critical period for artificial flower promotion.

Pest control

Young fruits at this stage are extremely sensitive to drugs, so drugs that do not damage the surface of the fruit must be used to prevent fruit rust. Pests focus on the prevention and control of aphids, red spiders, mealybugs, apple leaf rollers, boat-shaped caterpillars, and swing caterpillars.

Cultivating loose soil and applying green manure

Cultivation loosening the soil and pressing green manure can improve the root growth environment, increase the content of soil organic matter, and improve soil permeability.