The effect of harvesting fruit fertilizers allows trees to be restored in time. There is sufficient nutrition accumulation in winter to increase cold resistance. After nutrition is supplemented, it can promote good differentiation of flower buds, laying a foundation for improving the fruit setting rate in the next year, and providing a basis for the next year's spring harvest. Germination lays the foundation; the application of harvested fruit fertilizer can prevent defoliation in winter and prolong the life of the leaves, which is beneficial to preserve the fruits and fruits in the next year.
The method of fertilizer application in fruit harvesting has always emphasized the use of harvested fruit after harvesting. However, according to the experience of citrus high-yield units, the combination of harvested fruit fertilizer before fruit harvesting and post-harvest fruit picking can better complement each other and give full play to restoring tree vigor. The role. The first is to apply fruit fertilizer as early as possible, that is, 10~15 days before fruit harvest. At this time, the high temperature in the autumn facilitates the absorption and utilization of citrus roots, exerts the fertilizer effect as soon as possible, and enhances the photosynthetic efficiency of the leaves; if the application is too late, the temperature drops, the decomposition of the fertilizer is slow, and the root absorption capacity is weak, and the effect of restoring the tree vigor is not achieved. Therefore, early maturing varieties are generally available from late September to early October; mid-maturing varieties are usually finished in mid-to-late October; other varieties can be determined according to the fruit ripening period. Second, early and mid-matured tangerine after picking fruit, touch orange and other late-maturing varieties after harvest in late November, late no later than December, as the winter fertilizer. After picking, fertilizer should be applied sooner rather than later. Whether it is pre-harvest or post-harvest application, the total amount of fertilizer should generally account for about 30% to 35% of the annual fertilization amount. The fruit harvesting fertilizer is best based on organic fertilizers, and the growth of citrus trees is considered, and some quick-effect fertilizers, such as urea, ammonium sulfate, and ammonium bicarbonate in fertilizers, or fully decomposed human and animal wastes and cakes, are suitable. Incompletely decomposed and difficult-to-decompose organic fertilizers, due to their slow fertilizer effect, should not be applied before fruit harvesting, and can be left as winter fertilizers after fruit picking.
Before applying for harvesting fruit, generally every mandarin tree is cooked with 50 kilograms of human and animal manure water, 0.3 to 0.5 kilograms of urea, 0.2 to 0.3 kilograms of calcium magnesium phosphate, and 0.25 kilograms of potassium chloride. For a long time. Or about three kilograms of ternary compound fertilizer per adult tree, using arc or circular deep ditch. In the red soil, the orange groves should also be used to sow 50-75 kilograms of lime per acre before planting in the garden in winter. After the fruit is harvested, combined with winter fertilizer, according to the current year's yield, a reasonable application amount is determined. In general, the yield tree of 50 kg per tree can be used to apply pig manure 20 to 25 kg and human excrement 10 to 15 kg. Fertilizer 1 kg. Fertilizers must be applied deeply. The depth of fertilization should be 20-30 cm. It is advisable to apply sufficient water at the same time as fertilizing. It not only dilutes the chemical fertilizer concentration, prevents the burning of roots, but also facilitates the rapid growth of the root system. At the same time, 0.5% to 1% urea, 0.3% to 0.5% potassium dihydrogen phosphate and 0.3% to 0.5% zinc sulfate can be used as extra-root fertilizers to increase various nutrients required for the tree.
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