High-yield planting techniques of pomelo

Planting technology "inline=" 0 ">

1. Soil requirements:

Grapefruit can be planted as long as the soil layer is deep and the drainage is good, but the sandy soil is the best. In the field management, the newly planted young trees should have sufficient water and fertilizer, and the new high-fat film should be sprayed to ensure that the aboveground water does not evaporate, the seedling water does not transpirate, isolate the diseases and insect pests, shorten the slow seedling period and speed up the root development. It is required that the soil layer is deep (60cm) and fertile, the soil ph value is 5.5-7.0, and the orchard slope is less than 25 degrees. When planning the garden, there shall be necessary roads, drainage and irrigation, water storage and ancillary construction facilities. In specific planning, we should concentrate as much as possible and build gardens in places with good transportation and water sources. In the period of flower bud differentiation, adult fruit trees are coated with flower-promoting agents to promote flower bud differentiation and inhibit the wild growth of summer shoots, while spraying at the end of autumn can inhibit the emergence of winter shoots.

We should do a good job in deep turning and expanding holes and ripening the soil, prohibit the planting of tall plants such as corn and wheat in the garden, and do a good job in rational intercropping and weeding in the orchard.

2. Planting requirements:

(1) time. It is generally planted after autumn shoots mature from September to November or before spring shoots sprout from February to March.

(2) density. The density of plant spacing 3m × row spacing 4m was used to plant 55-60 plants per mu.

(3) planting technology. Soil digging planting holes: drawing wire and fixed distance, digging planting holes, each 80 cm deep and 80 cm wide, then pressing green manure 50 cm deep, backfilling soil 40 cm high planting; field ridging planting: 8 meters with trench (60-8 cm wide, 40-60 cm deep), 2 ridges per box (1.5 meters wide, 4 meters from the center of the ridge, 20-30 centimeters high). When planting, the root system of the seedling is appropriately trimmed and placed in the center of the planting hole to stretch the root system and straighten it. While filling the soil, the seedling is raised gently and firmly, so that the root system is closely connected with the soil. Pour enough water on the roots, make a 1m plate around the seedlings and cover it with bran shells.

Planting technology "inline=" 0 ">

3. Planting:

The planting period is generally in spring (February-March) and autumn (September-October). The planting density is 3 × 3.5 meters and 60 plants are planted per mu. Large hole colonization is adopted, which is required to be 80 cm deep and 100 cm wide. After planting, root Xiaobao (2-3kg) per mu was drenched with water, and the ridge of the hole was cultivated into a tree plate with a height of 15-20 cm and a diameter of 60-100cm, and then covered with straw.

4. Sapling management:

The principle of "frequent application and thin application" should be adopted in the fertilization of young trees, and quick-acting fertilizer should be applied 2-3 times a month. And make a good set of vegetables or dwarf crops. After 2 years of planting, the trunk shape of the side was changed uniformly, and the methods of supporting, pulling, hanging and wiping buds were adopted to make the crown ventilated and transparent, and the inner bore to bear more and stronger mother branches. According to the growth of the tree, the ring cutting technique was adopted to increase the nutrient accumulation of branches and shoots and promote early fruiting.

5. Thinning flowers and protecting fruits:

When most of the buds are the size of a match head, start thinning the flowers, remove the spikes, tails and weak buds when the buds are white, and leave only 4-5 strong buds in the middle. After the second physiological fruit drop, the abnormal fruit was removed, and the fruit was retained according to the ratio of leaf to fruit when the ratio of leaf to fruit was about 60-70:1. Fruit protection is mainly sprayed with 2.4-D5-10PPm or Fangluo after flowering.

6. Fertilization management:

Emphasis is placed on organic fertilizer. Fruiting trees had better not use chemical fertilizers, especially those containing chlorine. The first fruit trees (3-4 years) are mainly fertilized three times after fruit picking, before sprouting in spring and in the period of strong fruit. Base fertilizer was applied once from August to September after fruit harvest, mainly planting Meijia series liquid fertilizer, quick-acting nitrogen fertilizer was applied before spring shoot sprouting in February to promote spring shoot growth, and strong fruit fertilizer was applied in early June, mainly phosphorus and potassium fertilizer to promote fruit expansion and shoot growth.

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