Principles of cultivation and fertilization of pollution-free Ponkan

"A flower in a crop depends entirely on fertilizer." Ponkan fruit trees must be fertilized scientifically in order to have high quality, early fruit, high and stable yield. The pollution-free cultivation of ponkan should be carried out in accordance with the regulations of NY/T496-2002. Fully meet the needs of mandarin fruit trees for various nutrient elements, promote the application of more organic fertilizer, rational application of chemical fertilizer, promote leaf nutrition diagnosis formula fertilization. The fertilizers used in mandarin fruit trees should be registered or exempted from registration by agricultural administrative departments, and the use of chlorine-containing fertilizers should be restricted. Mandarin fruit trees should be fertilized economically and scientifically according to varieties (strains), rootstocks, soil, climate, fertilizer types and planting density.

1. Look at the trees and apply fertilizer

Fertilize scientifically and rationally according to different varieties (strains), rootstocks, tree age, growth period, tree strength and different deficiency diseases.

2. Fertilizing according to climate

Because the climatic factors such as temperature and rainfall not only directly affect the ability of Ponkan root to absorb nutrients, but also have a great influence on the decomposition of soil organic matter, the transformation of nutrient forms and the activities of soil microorganisms, therefore, reasonable fertilization should be combined with climate.

3. Look at the soil and apply fertilizer

That is, according to the soil type, texture, structure, water condition, soil organic matter content, soil pH and soil ripening degree of Ponkan cultivation, reasonable fertilization should be applied according to local conditions.

4. Economic fertilization

Economic fertilization means to obtain the best economic benefit with the lowest fertilizer cost. At present, the most effective method is leaf nutrition diagnosis, combined with the results of soil nutrition diagnosis.

5. the combination of fertilization and other cultivation measures

The high quality and high yield of Ponkan is the result of comprehensive cultivation measures. Therefore, fertilization should be combined with ripening and improving soil, tillage, irrigation, shaping and pruning, flower and fruit protection and pest control.