Fertilizer requirement characteristics, high yield fertilization technology and time of loquat tree

Characteristics of fertilizer demand and high yield fertilization technology and time of loquat tree: loquat is a kind of subtropical evergreen woody fruit tree, its root system is shallow, mostly distributed in 10-50 cm soil layer, the requirement for nutrients is high, and the demand for potassium of adult trees is the highest. followed by nitrogen and phosphorus. According to research, to produce 1000 kg fresh fruit, it is necessary to take 1.1kg of nitrogen, 0.4kg of phosphorus and 3.2kg of potassium. The period from flowering to fruit expansion was the period when loquat absorbed the most nutrients, especially phosphorus and potassium. If the nutrient supply is improper in each growth period, it will have a negative impact on loquat production. When the nitrogen supply was too much in the later stage, the taste of the fruit became light. Proper supply of potassium can increase yield, improve quality and increase resistance. However, if there is too much potassium supply, the pulp is often hard and sour, which should be paid attention to when applying fertilizer.

The fertilization of loquat is different between young trees and adult trees. Young trees are fertilized 5-6 times a year, mainly nitrogen fertilizer and phosphorus and potassium fertilizer. The adult trees were applied 1020kg of nitrogen, 15kg of phosphorus and 10kg of potassium per 667 square meters.

Before each flowering, base fertilizer was applied in autumn, nitrogen and potassium accounted for 50% of the total fertilizer, phosphorus accounted for 40%, and organic and inorganic fertilizers were applied together to promote flower bud differentiation and flowering, increase storage nutrients, and improve cold resistance.

For the second young fruit expansion fertilizer, the application rates of nitrogen, phosphorus and potassium account for 20%, 40% and 30% of the total fertilizer, respectively. Available nitrogen, phosphorus and potassium are suitable, which can reduce fruit drop and promote young fruit development and spring shoot growth. The third time is postharvest fertilizer, nitrogen fertilizer accounts for 30%, phosphorus and potassium each account for 20%, organic and inorganic fertilizers should be combined to restore tree potential and cultivate good fruiting mother branches.

Throughout the growing period, foliar fertilizer can be applied according to the tree potential. Foliar fertilizer can use 0.5% ~ 1% urea and 0.2% urea. 3% potassium dinitrogen phosphate, 0.1% ~ 0.2% borax can also be sprayed at flowering stage.