Litchi is one of the most important management measures for the timely and appropriate application of fruit fertilizer, and many factors should be taken into consideration when applying litchi fertilizer. Litchi trees from 7 to 12 years old have reached a certain area of ​​the canopy. Some orchards have been sealed and the expansion of the canopy area is not a management goal. The main goal is to form flowers and fruit in litchi. Therefore, in the cultivation of post-harvest autumn shoots young trees should generally be 3 times the tip is appropriate, adult trees with 2 shoots is appropriate.
1, fertilization principle
To balance the nutrient status and soil status of the tree, supplement nutrients, according to the tree needs the proportion of various types of mineral nutrients supply.
2, fertilization time and fertilizer types
Early maturing varieties are harvested early, and post-harvest cultivation is more than sufficient for three autumn shoots. Young, young and young fruit trees are usually applied 7 days after fruit picking; each shoot can be planted according to tree vigor, and old and weak trees and fruiting Multiple trees can be applied before harvesting fruit.
(1) The fertilization time for three post-harvest cultivations of the autumn shoots is: the first time the fertilizer is re-applied after fruit picking, organic fertilizer is used as the main fertilizer, and the fertilizer is used for quick-effective fertilizer; the second fertilizer is mainly nitrogen fertilizer; Appropriately, when the first shoot is old and ripe, it can not be applied if the tree vigor is strong; if the first tipping time is early, the application time can be postponed. The third fertilizer combined with nitrogen, phosphorus and potassium can be used as compound fertilizer. When the second shoot is just cooked, if the second autumn shoot is too weak, it should be sprayed once with a foliar fertilizer. The second and third fertilizers are applied according to the tree-trends as appropriate.
(2) The post-harvest cultivation of two autumn shoots is not required for immediate fertilization after harvest, and the first fertilization time is delayed by 10 to 15 days compared to three autumn shoots. Organic fertilizer is the main fertilizer and is combined with quick-effect fertilizer. When the second autumn shoots are taken out, depending on their degree of strength, it is appropriate to make up for the available fertilizer.
3, fertilizer amount
The fertilizer for fruit picking accounts for about two-thirds of the annual fertilization amount, and is calculated as 50 kilograms of fruit. Each plant has 30 to 40 pounds of quality chicken manure or 4 to 5 pounds of peanut bran, 3 to 4 pounds of compound fertilizer, and 1 to 2 urea. 3 kg to 3 kg of ammonium bicarbonate or 30 to 50 grams of borax. If magnesium deficiency and zinc deficiency symptoms should be supplemented, 100 to 200 grams of magnesium sulfate and 30 to 50 grams of zinc sulfate can be applied. Both peanut bran and chicken manure must be cooked through tanning.
4, fertilization method
Open three ring grooves under the canopy drip line, 30 to 40 centimeters deep. Combine the pressure green, the bottom layer of the weed green fertilizer, the middle layer of the organic fertilizer, the upper layer of the fertilizer, and the cover soil after fertilization. Old trees and big trees can be used for radioactive fertilization.
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