1. Fertilization issues and fertilization principles

In view of the common acidification of litchi orchard soil, poor fertilizer and water retention capacity, general lack of magnesium, boron, calcium and molybdenum, unscientific fertilization, unreasonable fertilizer ratio, famine fertilizer abuse and lack of pertinence, the following fertilization principles are proposed. :

(1) Pay attention to the application of organic fertilizers, fertilize according to the growth period, rationally mix nitrogen, phosphorus and potassium fertilizers, adjust fertilization plans according to factors such as litchi varieties, growth and climate;

(2) Strong acid orchard in soil, apply appropriate amount of lime, calcium magnesium phosphate fertilizer to adjust soil pH and supplement corresponding nutrients;

(3) Using suitable fertilization methods, targeted application of medium-level element fertilizers;

(4) Fertilization combined with other management measures, such as drip irrigation.

2. Fertilization amount and method

(1) The result is that the tree is about 50 kilograms per plant: 10-20 kg of organic fertilizer per plant, 0.75-1.0 kg of nitrogen fertilizer (N), 0.25-0.3 kg/mu of phosphate fertilizer (P2O5), and potassium fertilizer (K2O) 0.8. ~1.1 kg, calcium fertilizer (Ca) 0.25 ~ 0.35 kg, magnesium fertilizer (Mg) 0.07 ~ 0.09 kg.

(2) Young trees with no fruit or less results: 5-10 kg of organic fertilizer per plant, 0.4-0.6 kg of nitrogen fertilizer (N), 0.1-0.15 kg of phosphate fertilizer (P2O5), and 0.3-0.5 kg of potassium fertilizer (K2O).

Fertilizers were applied 3 to 4 times in post-harvest, pre-flowering, Xiehua and strong fruit. Depending on the growth of the lychee tree, the flower before and the Xiehua fertilizer can be combined, or the Xiehua fertilizer and the strong fruit fertilizer can be combined. The application rate of nitrogen fertilizer in the above four growth stages is 45%, 10%, 20% and 35%. The phosphate fertilizer can be applied once after harvesting or after two times of mining and twice before flowering. The application rate of potassium, calcium and magnesium fertilizer is 30. %, 10%, 20%, and 40%.

Boron deficiency and molybdenum-deficient orchard, spray 0.2% borax +0.05% ammonium molybdate before flowering, Xiehua and fruit expansion period; orchard with pH<5.0, apply 100 kg of lime per acre, 5.0