How can sugar oranges be seedless?

The seedlings or seeds of seedless tangerine are purchased in the market, the soil should be loose, fertile and well drained, and the pH value is 5.5-6.5. Select seedlings with a height of about 50 cm, well-developed roots and no diseases and insect pests, and plant them according to appropriate specifications. After planting the seedlings, do a good job of fertilization, watering, pruning, prevention and control of diseases and insect pests.

I. planting techniques

1. Soil: sugar orange has a wide range of adaptation to the soil, but the soil is loose, the structure is good, the content of organic matter is 2%-3%, and the soil with good drainage is the most suitable, with a pH value of 5.5-6.5.

2. Planting: select the seedlings with a height of about 50cm, well-developed roots and no diseases and insect pests, and plant the seedlings according to the specifications of 80 plants per mu in 10x7, 100plants per mu in 10x6 or 110plants per mu in 9x6.

3. Fertilizer and water: young trees are mainly fertilized by nitrogen fertilizer, combined with phosphorus and potassium fertilizer, fertilizing 5-6 times in spring, summer and autumn shoots, each time applying 0.4 jin of ammonium bicarbonate or 0.2 jin of urea. Adult trees should apply sprouting fertilizer, fruit protection fertilizer, strong fruit fertilizer and fruit picking fertilizer. The soil is irrigated when it is dry and drained when it is stagnant.

4. Pruning: young trees are mainly light pruning, truncating the elongated branches in the center and the extended branches of the main branches and secondary branches, and cutting off the dense branches. In the initial stage, the extended branches of all levels of backbone were truncated and the summer shoots were erased. In the full fruit stage, the fruiting branch group, the falling flower fruiting branch group and the declining branch group were retracted, and the light-blocking branches, dead branches, disease and insect branches were cut off.

5. Diseases and pests: diseases include anthrax, foot rot, etc., and pests include mites, scales, aphids, leaf moths, longicorn beetles, flower bud maggots, etc., which should be controlled in time.

II. Points for attention

1. Cannot be mixed with seeded varieties

two。 Fructus Aurantii is the most suitable rootstock.

3. Narrow plant and wide row are adopted to prolong the closing time.

4. the method of ring cutting and fruit protection is used to reduce the second physiological fruit drop.

5. Control summer shoots with control element.

6. combine the fruit thinning before the autumn shoot, and remove the fruit that is too large and too small.

7. pay attention to the control of diseases and insect pests, mainly to control leaf moths, red rust spiders, citrus whitefly, aphids, butterflies, wood lice, Huanglong disease, anthrax and so on.