Lemon tree fertilization frequency and principle

The principle of fertilizer application for lemon trees is to apply deep autumn fertilizer and fruit-picking fertilizer.

When the spring shoots sprout from February to March, the first fertilization is carried out, and some nitrogen fertilizers are supplemented according to the strength of the tree. Trees with weak wood and many flowers should be applied more appropriately; trees with strong wood and few flowers should be applied less or not. The amount of nitrogen fertilizer accounts for 10 to 15% of the total annual amount, which promotes the robust growth of spring shoots and spring flowers.

The second fertilization is after flowering and before the fruit expands, combined with fruit preservation and insect control, and spraying 0.3% urea solution several times to replenish the loss of tree nutrients after flowering and increase the amount of fruit.

The third fertilization is from July to August, which is the period of autumn shoot extraction and fruit expansion. This time, the amount of fertilization is large. Nitrogen fertilizer accounts for 40% of the annual amount, and phosphorus and potassium fertilizers each account for 50%. Two fertilization pits are opened at the drip line of each plant, with a depth of 30-40 cm to ensure that the mother branches of autumn shoots are strong. Spring flowers are well differentiated.

For the fourth fertilization, deep fertilization was repeated after fruit picking in November and before the temperature dropped. Deep dig pits on the other side of the fertilization in autumn. The amount of nitrogen fertilizer applied accounts for 40% of the annual amount, and the phosphorus and potassium fertilizers each account for 40%. The organic delayed-effect fertilizers such as green manure and slag fertilizer are the main ones.