Sugar and orange management of young trees
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The growth characteristics of juvenile trees are that the vegetative growth is vigorous, the number of hair tips is high, and the branch shoots are also germinated. The roots of the new planting period have not been fully developed. Therefore, the management of juvenile sugar orange trees should be properly adjusted for fertilizer and water, and the main contents should be the water management of thin application of fertilizers and drought prevention.
1. Reasonable fertilization
(1) New tree fertilization
If the new planted orange is planted in early spring, it will begin to grow roots 20 days after planting. Therefore, the seedlings will be fertilized after 20 days of planting, and 0.4% of the compound fertilizer solution will be applied near the roots. For example, if there is any animal manure or decomposed bran water and the compound fertilizer solution is mixed, the effect is better. In the first year, apply 2 thin fertilizers monthly.
Fertilization should be combined with tipping. At the initial stage of planting, due to the differences in individual seedlings and growth conditions, the first shoot should be allowed to grow, and the shoots should not be controlled. However, the shoots on the second shoot and subsequent shoots should be uniformly pushed. Fertilization should be based on the tipping period, so that each tip of the "three fat", that is, 15-20 days before the release of the fertilizer applied, until the new shoots with 4-5 leaflets, Shi second fertilizer, in When the new shoot stops growing and begins to turn green, Shi 3rd fertilizer is applied.
(2) Biennial tree fertilization
After entering the second year, the roots of the seedlings have been deepened, and the control of the shoot tipping has also been transferred to normal, and the proper management of the fertilizer and water growth has been rapid. Therefore, the amount of fertilizer should gradually increase. Fertilizer can be applied dry, that is, compound fertilizer or ammonium bicarbonate, phosphate fertilizer, potassium fertilizer can be applied under open acupuncture, poured with bran water or 0.5% urea solution, and then covered with soil. The amount of dry fertilizer also gradually increased from 0.15 kg per plant to 0.3 kg.
If the results are set for the fourth year, the three-year-old tree can be fertilized by two-year-old trees, but the amount of fertilizer should be increased appropriately. The frequency of fertilization is also carried out according to the "three fats" per shoot.
2. Fertilization method
Fertilization usually refers to rhizosphere fertilization, but it can also be applied extra-root. Note that extra-root fertilization cannot substitute for rhizosphere fertilization.
Young trees are usually fertilized with 10-15 cm deep grooves at 20-25 cm from the tree trunk to apply the fertilizer. With the expansion of the canopy, fertilization is applied to the canopy drip line, and the circumferential groove gradually moves outward.
With the growth of the tree age, the roots are deep and deep, and fertilization can also be performed by applying acupuncture points. That is, digging 2-3 lengths, widths of 20-30 cm, and depths of 10-15 cm under the canopy drip line for fertilization. In addition to increasing the amount of fertilizer, the fertilization form can gradually shift from water and fertilizer to dry fertilizer. In production, it is best to apply water fertilizer after applying dry fertilizer to the hole, and then backfill fertilizer points. However, it should be noted that no matter how big the crown is, the concentration of water and fertilizer should not be too large, so as to avoid the occurrence of fertilizer damage.
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