Using biogas slurry as the "spring shooter" and "summer shooter" topdressing fruit trees can increase fruit set rate by 5%, increase production by about 20%, enhance quality, and increase sweetness by 0.5 to 1%.
Principles of fertilization: Different fruit tree ages have different application rates, and biogases are generally used during the growth period.
Fertilization method: "summer shooter" (biogas liquid) is applied in early May and "autumn shooter" (biogas liquid) is applied at the beginning of July. The adult tree mainly applies flower fertilizer (biogas slurry) before the flowering result, and the young fruit grows strong. Fruit fertilizer (biogas slurry), in the drip line around the canopy, open round or half moon-shaped groove, groove width 30 cm, depth 35 cm, such as soil depth difference of 50 cm is appropriate, each plant with biogas residue 100~150 Kilograms, appropriate addition of some phosphate fertilizer, cover soil slightly convex, to prevent accumulation of water. In the flowering and fruiting period, foliar spray fertilizer can also be used to supplement the nutrients. During the flowering period, 100 kg of clarified biogas slurry is used to water 300 kg (1:2~3) and sprayed directly into the foliage (leaves back). 100 kilograms of clarified biogas slurry is mixed with 100 kilograms of water (1:I) and sprayed directly onto leaves and fruit surfaces. It is used 2 or 3 times a month. Foliar spraying is best done on a sunny evening.
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