How to fertilize young longan trees? Latest technical method tutorial
The management of young longan trees focuses mainly on promoting shoot growth and expanding the canopy, so to meet their growth needs, fertilizer must be applied adequately. So how should young longan trees be fertilized? Let's find out together.
1. Root fertilization
Newly planted seedlings can be fertilized once they have grown new roots. Since seedlings often sprout before rooting after planting, fertilizer should be applied once when the new shoots turn green and mature. However, perennial seedlings have underdeveloped root systems, so fertilizer should be applied lightly, preferably diluted with water and drenched on, to facilitate root absorption. In the year of planting, water and fertilize once every half month, mainly with thin manure, and a low-concentration urea and compound fertilizer solution can also be drenched on. Two years after planting, apply topdressing twice: once before new shoots sprout, apply a shoot-promoting fertilizer mainly of nitrogen fertilizer, and once when the new shoots turn green, apply a shoot-strengthening fertilizer mainly of phosphorus and potassium fertilizer. Liquid fertilizer can be drenched on directly, while chemical fertilizer can be applied in a ring-shaped trench along the drip line of the canopy. The amount of fertilizer depends on the size of the plant. For the shoot-promoting fertilizer, apply 5-10 kg of diluted human manure urine fertilizer per plant; for the shoot-strengthening fertilizer, apply 0.05-0.15 kg of compound fertilizer per plant.
2. Foliar fertilization
Foliar fertilization means spraying liquid fertilizer onto the longan canopy. The leaves are the absorbing organs, and the underside of the leaves has a large number of stomata, which are the main site for absorbing foliar fertilizer, while the leaf surface has a cuticle layer with greater absorption capacity, so when spraying foliar fertilizer, be sure to spray the underside of the leaves. Foliar fertilizer has the advantages of strong absorption and high fertilizer utilization, and can to a certain extent meet the plant's similar nutrient needs during specific growth and development periods. Foliar fertilization of young trees is usually carried out together with pest-control spraying, and 0.3% potassium dihydrogen phosphate, 0.3-0.5% compound fertilizer leach solution, and organic fertilizer composted liquid can be sprayed.
3. Deep plowing and soil improvement
Young trees can undergo deep plowing and soil improvement in the year after planting. The method is to dig outward from beside the planting hole, widening by 0.4 m and reaching a depth of 1.6 m, with the length depending on the specifications of the planting hole. Trenches for soil improvement can be dug on both sides of the young tree, or along any side of the planting hole. However, be careful to connect the soil-improvement trench with the planting hole, and do not leave a separating layer, so as not to affect root growth. When digging the trench, if longan roots are encountered, cut them promptly to encourage new root growth. Young trees can begin deep plowing and soil improvement throughout the orchard. When digging the soil-improvement trench, pile topsoil and subsoil separately, fill the lower layer of the trench with weeds, crop straw, green manure, etc., and spread lime in layers at a rate of 0.5 kg per sq m.
The above is an introduction to fertilization techniques for young longan trees. We hope it helps you. To learn more related knowledge, please stay tuned to us.