Do you need to fertilize lychee flowering, and what fertilizer to apply to lychee flowering

<> "Lychee flowering requires proper fertilization. During the flowering and growth period of lychee, fertilizer can be applied under the tree or in the rhizosphere, and it is generally recommended to use organic fertilizer or compound fertilizer. Depending on the climatic conditions and soil conditions of the area, the appropriate fertilization method and type of fertilizer can be selected.

However, it should be noted that excessive fertilization can lead to stunted fruit development, so the amount of fertilizer applied should be controlled within an appropriate range.

Lychee flowering fertilization is generally used during the pregnancy bud stage, which can be applied with phosphorus and potassium fertilizer to reduce the amount of nitrogen fertilizer used, which can effectively promote the differentiation of flower buds. Early-maturing varieties mainly supplement the tree with nutrients during the flowering period, and fertilizers such as potassium dihydrogen phosphate and magnesium sulfate can be used.

1.Fertilization methods for young trees.

Lychee seedlings can be fertilized 1 month after planting, when new roots germinate. Fertilization should be done in small quantities and many times, mainly with nitrogen fertilizer. For annual trees, fertilizer is applied once a month, 20 grams of urea are applied to each plant, and 5 kg of water is added to shower.

2 3-year-old trees, the number of fertilizer is reduced, 10 days before each shoot germination, apply fast-acting fertilizer, apply kilograms of compound fertilizer per plant, and add water to shower.

2.Fertilize before lychee flowering.

Generally, when the flower buds are about to open, the pre-flower fertilizer should be mainly phosphorus and potassium fertilizer, and too much nitrogen fertilizer can not be applied. Generally, 50 kg of lychee trees with fruit are applied to each plant with compound fertilizer kilograms or kilograms of urea, kilograms of potassium chloride and kilograms of superphosphate.

Early maturing lychee varieties were sprayed twice with foliar fertilizer before flowering to supplement tree nutrition, sprayed once every 10 days, sprayed with 30 grams of potassium dihydrogen phosphate, 15 grams of borax, 15 grams of magnesium sulfate, and 15 kg of water. Medium and late maturing lychee varieties sprayed foliar fertilizer twice at the flowering spike stage, the first time with 15 grams of borax, plus 30 grams of potassium dihydrogen phosphate, half a pack of nucleotides, sprayed with 15 kg of water, sprayed with 15 grams of borax at an interval of 10 days, with 15 grams of borax, 30 grams of potassium dihydrogen phosphate, 15% brassinone grams, sprayed with 15 kg of water.

3.Lychee stabilizes the fruit and strengthens the fruit fertilizer.

Fertilization is required twice during this period, at the young fruit stage and in the middle of fruit development. During this period, potassium fertilizer was mainly used, combined with phosphorus and nitrogen fertilizer. Generally, for lychee trees with 50 kilograms, each plant is applied with 1 kilogram of compound fertilizer or kilogram of urea, kilogram of potassium chloride, kilogram of calcium, magnesium and phosphorus fertilizer.

At the same time, it is necessary to spray foliar fertilizer twice, the first spray of foliar fertilizer of early-maturing lychee varieties is generally in early April, each plant is sprayed with 45 grams of urea, 30 grams of potassium dihydrogen phosphate, and 15 grams of anti-falling pigment, and the second time is carried out in mid-April, with 45 grams of urea, 30 grams of potassium dihydrogen phosphate, 2 grams of brassin, and 15 kilograms of water are sprayed. The middle and late maturing varieties were sprayed for the first time in early May, with 30 grams of urea, 45 grams of potassium dihydrogen phosphate, and 15 kg of anti-drop subsum, and the second time was sprayed at the end of mid-May, with 30 grams of urea, 45 grams of potassium dihydrogen phosphate, 920 grams, and 15 kg of water.

4.Fertilize lychees after fruit picking.

Early-maturing lychee varieties were best fertilized within one week after fruit picking, and medium- and late-maturing lychee varieties were best fertilized one week before fruit picking. Generally, lychee trees with 50 kg of fruit, each plant is applied with 1 kg of compound fertilizer or kg of urea, kg of potassium chloride, and kg of magnesium sulfate.

5.Lychee secondary autumn shoot fertilizer.

This fertilization was mainly applied before the second autumn shoot germination of lychee trees, and the fast-acting fertilizer was mainly used to promote shoots. Generally, 50 kg of lychee trees bear fruit, and each plant is applied with kilograms of urea, kilograms of potassium chloride, and kilograms of magnesium sulfate.

Lychee flowering period also has certain requirements for fertilization, lychee flowering period can be fertilized, but the amount of fertilizer should be small, fertilizer should be early starvation of low nitrogen and high potassium fertilizer, in order to ensure the normal flowering period of lychee, reduce the situation of uncontrolled flowering caused by fertilization. The requirements for fertilization are as follows: 1. Fertilization should be done in a small amount of appropriate lychee fruit development stage, and the amount of fertilizer should be controlled within 200 kg per mu.

2. To avoid the ratio of nitrogen to phosphorus is too low, the ratio of nitrogen to phosphorus is too low, which will cause flowering delay and scrapping, so it is necessary to ensure that the appropriate amount of nitrogen and phosphorus is applied together, the appropriate amount of nitrogen is applied, more potassium is applied, and the ratio of nitrogen to phosphorus reaches 3:1, and the amino acid or potassium-hydrogen compound nitrogen fertilizer can also meet the requirements of the nitrogen and phosphorus ratio. 3. Add trace elements in a timely manner, such as organic and inorganic compound fertilizers, and add a certain amount of trace elements in a timely manner, such as calcium sulfate, which can be conducive to the development of flowering.

The fertilization of lychee fruiting trees should focus on three fertilizers.

1) Flower-promoting fertilizer: or pre-flowering fertilizer. It is mainly to enhance the nutrition of the tree before flowering, promote the differentiation of flower buds, increase the number of female flowers, and reduce the physiological fruit drop in the first stage of flower drop and young fruit development.

This fertilizer should be applied 10 to 20 days before flowering, and it is generally believed that early and medium-maturing varieties should be applied around the "small cold" in early January, and late-maturing varieties should be applied before and after the "big cold" in late January. Usually 50 100 kg of decaying human feces and urine per plant, with 1 kg of compound fertilizer.

2) Strong fruit fertilizer: or strong fruit preservation fertilizer. It is mainly to supplement the nutrient consumption of trees brought about by flowering, promote fruit development, and reduce physiological fruit drop in the second stage.

This fertilizer should be applied after flowering to before the second physiological fruit drop, that is, early maturing seeds in early April (Qingming), late maturing seeds in late May (Xiaoman).

At this stage, nitrogen, phosphorus and potassium fertilizers should be applied together, and 2:1:2 high-concentration compound fertilizer can be selected, about 2 kg per plant. At this stage, spraying borax solution or spraying 50 mg kg of gibberellin mixture has a good effect on flower and fruit preservation.

3) Shoot fertilizer: also called fruit picking fertilizer. The main purpose is to promote the recovery of the tree body and the development of autumn shoots, laying the foundation for a good yield in the coming year, but not to make the winter shoots germinate.

Therefore, fertilization should be timely and appropriate, for early-maturing seeds, robust trees should be applied after fruit picking, late-maturing seeds, fruit-bearing and weak trees should be applied in advance 10 15 days before fruit picking.

In this period, organic fertilizer and chemical fertilizer should be applied together, and 50 100 kg of well-decomposed high-quality organic fertilizer should be applied to each plant, and 1 kg of 1:1:1 compound fertilizer should be applied.

Adult lychee trees are generally fertilized 3 or 4 times a year (Tables 10-35).

1) Tapping fertilizer, mainly to apply fast-acting fertilizer, each plant to apply special fertilizer kilogram or urea kilogram + phosphate fertilizer kilogram + potassium chloride kilogram, can be applied in two times, once 7 10 days before fruit picking, pruning quickly after fruit picking. Apply the second fertilizer when the first shoot is mature, and the depth of the fertilizer is 20 40 cm, that is, when applying, the fertilizer is mixed with the soil or 50 times the water, and then the soil is covered. To apply organic fertilizer, it is best to apply it together with chemical fertilizer 7 to 10 days before fruit picking, with 3 kg of peanut bran per plant.

In addition, after the autumn shoots are ripe, lime can be applied in combination with the Qingyuan. The application of organic fertilizer is best when the temperature is low and relatively stable, such as the winter solstice in Guangzhou. Fast-acting organic fertilizers such as peanut bran and human and animal urine should not be applied during this period, so as not to trigger the growth of winter shoots.

It is recommended to apply delayed organic fertilizer, such as forage and cow manure, add 1 kg of phosphate fertilizer and lime per 100 kg of organic material, and apply 10 kg of water to the ditch.

2) Flower fertilizer, applied in the flower bud differentiation (when the fruit shoots have red spots), apply 2 3 kg of special fertilizer or urea kg + phosphate fertilizer kg + potassium fertilizer kg per plant, sprinkling or hole application; In addition, when the flower spike grows to 10 15 cm, apply 50 grams of borax, 200 grams of magnesium sulfate, 80 grams of zinc sulfate, kilograms of phosphate fertilizer, and kilograms of potassium fertilizer (application method is the same as above).

3) Fruit fertilizer, applied 7 to 10 days after flowering and fruit expansion, and reapplied phosphorus and potassium fertilizer. The first application should look at the leaf color, if the leaf color is light green, the old leaves are light yellow, apply 1 2 kg of special fertilizer or urea kg + phosphate fertilizer kg + potassium fertilizer kg; When the leaf color is dark green, no nitrogen fertilizer is applied, and the phosphorus fertilizer is halved. The second fertilization should pay attention to the selection of nitrogen sources, and apply kilograms of calcium nitrate, phosphate fertilizer, and potassium chloride for each plant (the method is the same as above).

It can also be combined with the application of organic fast-acting fertilizers, such as peanut bran, manure, cow urine, etc.

4) Foliar spraying, during the annual growth period of lychee trees, 600 800 times dilution of Nonghai brand amino acid compound micro-fertilizer can be sprayed, or combined with top dressing, water-soluble fertilizer can be added as needed for foliar spraying, sprayed once every 7 10 days.

Organic fertilizer can be applied during the flowering period of lychee, the organic fertilizer and fresh water can be mixed evenly, and then deep irrigation around the roots of the tree, and some coarse rot material can be sprinkled on the vegetable field to promote fertilizer.

Among them, organic fertilizers will not pollute the environment, can promote the growth and development of lychees, and nourish the development of fruits.

In addition, fertilizers that regulate pH and supplement trace elements, and plant hormones can be applied to promote the development of germ next to flowering pins during the flowering period, so as to promote the quality of lychee fruits and improve the effect of acorn.

In addition, low concentrations of potassium fertilizer or potassium phosphate can be applied during the flowering period of lychee to reduce the pH value of the soil, promote the verdant branches and leaves, balance nutrition, and increase the quality of the fruit.

1. Lychee flowering fertilization is generally used in the bud pregnancy period, which can be applied with phosphorus and potassium fertilizer to reduce the amount of nitrogen fertilizer, which can effectively promote the permeation of flower buds.

2. If it is an early-maturing Pinchurian ridge species, it is mainly to supplement the nucleus nutrition of the tree during the flowering period, and fertilizers such as potassium dihydrogen phosphate and magnesium sulfate can be used. However, the best fertilizer is still fully rotted farmyard fertilizer, which is more conducive to the absorption and utilization of fruit trees, and has less impact on the soil.