Early spring is a critical period for the prevention and control of apple pests and diseases. The first step is to scrape bark rot lesions, ring vein lesions and old cracks, clean up the orchards, control the development of the disease, reduce the density of insects, and then apply wound protection agents. Spray 3~5 Baume Degree Lithosulfide Mixtures before and after pruning the whole garden; in the orchard with serious rot, spray 40% 40% Formamide WP 100~200 times.
Second, timely cutting before flowering is the key
Before the flowers are cut, it is an effective measure to correct winter shear errors and compensate for the destruction of the original winter cut tree shape due to climate and mechanical damage. This measure can adjust the proportion of flower buds and leaf buds and coordinate the relationship between growth and results. For the newly emerged saplings, flower buds should be retained as much as possible to alleviate the vegetative growth; for the young tree of the fruit period, flower buds should also be retained to obtain a certain amount of yield; for the fruity saplings, flower buds should be The proportion of leaf buds and buds is 1:3 to 1:2, and strict control of flower bud retention. The unbalanced forces of the backbone trees and branches can be adjusted by the difference in the amount of preserved flowers. The strong ones should spend more time on the flowers and the weaker ones should spend less on the flowers. It should be noted that the apple flowering season often encounters the hazards of low temperatures, high winds, and late frosts, affecting normal pollination and fruit setting. Flower buds should be left as much as possible until the fruit set is established.
Third, the management of good water is guaranteed
In the application of organic fertilizer on the basis of topdressing fertilizer to meet fruit tree flowering, fruit setting and shoot growth on the nutritional needs. The amount of topdressing can be determined by the soil, tree vigor, age, and yield. Generally, the young saplings on fertile soil do not have top-dressing, and the weak saplings on thin-soiled soils may be top-dressed. The initial result tree is followed by 0.5-1 kg of ammonium sulfate or 25-30 kg of decomposed human waste. Fruit trees in full fruit period, with 1.5-2.0 kg of ammonium sulfate per plant or 50-100 kg of human fecal urine, and if applicable, phosphorus and potassium fertilizers should be supplemented. Each plant applies 2.5-5.0 kg of superphosphate and 5-10 kg of plant ash. . In this way, not only can the yield increase, but also the fruit quality can be improved and the tree vigor can be increased. In the middle to late March and early April, watering is combined with topdressing. Because the temperature is still low at this time, the amount of irrigation should not be too large, so as not to reduce the temperature and affect the development of the root system. For orchards that have not been filled with frozen water before the year, they should be watered in time to facilitate the germination, flowering and fruit setting of the fruit trees.
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