1 fertilization principle
Fully meet the needs of fruit trees for various nutrients, mainly based on organic fertilizer, supplemented by fertilizer.
2 fertilization method
(1) Soil fertilization
Fertilization is carried out by means of shallow ditch application and deep ditch application. When applying top dressing, digging a trench or annular groove 20-40cm deep near the drip line on one side or both sides of the canopy. The length depends on the crown and the amount of fertilization, and the positions are rotated one by one.
(2) Foliar top dressing
The quick-acting fertilizer or the fermented and fermented organic liquid fertilizer and the foliar nutrient solution fertilizer are sprayed onto the leaves according to the multiples of water, and the nutrients lacking in the tree body are timely replenished.
(3) Fertilization of young trees
Master the principle of diligent and thin application, apply fertilizer once every 1-2 months. It mainly promotes the growth of spring, summer and autumn shoots with urea or decomposed farmyard manure. The amount of fertilizer applied, the ratio of total nitrogen, phosphorus and potassium was 1:0.3:0.7, the pure nitrogen was 12 kg, the pure phosphorus was 3.6 kg, and the pure potassium was 8.4 kg.
(4) Fruit fertilization
As a result, the tree was applied three times a year. The first spring fertilizer applied 20 kg of 45% potassium sulfate compound fertilizer and 15 kg of urea in mid-March; promoted spring shoot growth and young fruit nutrition; the second summer fertilizer was in June. In the middle, the application of 46% urea 15 kg, 45% potassium sulfate compound fertilizer 20 kg, promote fruit expansion and autumn shoot growth. In order to improve the quality of red meat pomelo, from the beginning of March to the end of June, the farmer's bio-liquid fertilizer is applied once a month to ensure the purity of the quality. The third base fertilizer (winter fertilizer) was mainly used in the period from November to December after the fruit picking, combined with deep-turning soil modification, organic fertilizers such as slag fertilizer and pig manure.
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