(6) Lychee
1. Fertilization problems and fertilization principles
In view of the common acidification of litchi orchard soil, poor fertilizer and water retention capacity, general lack of magnesium, boron, zinc and calcium, unreasonable fertilizer application, 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, drip irrigation, fertilization, fertilizer application, etc.
2. Fertilization advice
(1) The result is that the tree in the peak period (about 50 kg): 10~20 kg of organic fertilizer per plant, 0.75~1.0 kg of nitrogen fertilizer (N), 0.25~0.3 kg of phosphate fertilizer (P2O5), and 0.8~1.1 of potassium fertilizer (K2O) Kilograms, 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). Magnesium fertilizer (Mg) 0.05 kg.
Fertilizers were applied 6~8 times after harvesting (first shoot, one fat, 2~3 times), flowering, Xiehua and fruit development. 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%. The potassium dihydrogen phosphate solution can be sprayed during the flowering period.
In the orchard lacking boron and molybdenum deficiency, 0.2% borax + 0.05% ammonium molybdate was sprayed before flowering, Xiehua and fruit expansion period; 0.2% zinc sulfate or compound trace elements were sprayed at the tip of litchi. Orchard with pH<5.0, 100 kg of lime per acre, 5.0
This article URL: Guilin Guiding Opinions on Litchi Planting in Autumn and Winter 2015
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