Can Lagerstroemia indica seedlings be fertilized in the first year?

Fertilization is needed, but the amount of fertilization is small. Dig a planting pit (depth 1m, width 1m) and pile up subsoil and topsoil respectively. Apply 30-50kg of organic fertilizer, 0.5kg of ternary compound and 2kg of lime to plants, mix with soil, and backfill subsoil in the order of topsoil. After backfilling, the soil is 30cm higher than the ground. After planting, irrigate plants not less than 50 kilograms. Cover the film to keep water. Scientific fertilization is the key to fruit trees. The best time to apply base fertilizer to apple trees is after fruit picking in autumn and before germination in spring. The slow effect of fertilizer has little effect on the flowering and fruiting of fruit trees in spring and the growth of new shoots, and it will lead to the excessive growth of trees in the later stage, which will affect the flower bud differentiation and fruit development. It is suggested that basal fertilizer should be applied as little as possible, foliar fertilizer and new high-fat film should be sprayed as much as possible, and chemical fertilizer should be applied in combination with spring irrigation, mainly nitrogen and phosphorus fertilizer, with appropriate amount of potassium fertilizer. In order to promote flowering and fruit setting, the fruit-bearing trees should be topdressing nitrogen fertilizer 1 time from early March to early April, or spraying foliar fertilizer and new high-fat film, and spraying Zhuangguodiling 1 time before flowering, young fruit stage and fruit expansion stage, respectively, to thicken fruit stems and improve nutrient transport. Prevent falling flowers, falling fruit, cracking fruit, hard fruit and deformed fruit, and make the fruit beautiful in color, shape and taste.