It is required that the annual average temperature 16℃-22℃, the absolute minimum temperature ≥-7℃, the monthly average temperature 1≥4℃, and the annual accumulated temperature ≥ 10℃ above 5000℃.
2. Land
It is required that the soil texture is good, loose and fertile, the organic matter content is preferably above 1.5%, the soil layer is deep, the soil layer thickness is preferably above 60 cm, the groundwater level is below 1m, and the suitable pH value is 6-6.5.
3. Timing
When planted from each new shoot to the next, the root system is easy to recover and the seedling survival rate is high, especially before the new shoot. Generally, it is suitable in spring and autumn, and should be planted after the autumn shoots mature in September 9- 10/October or before the spring shoots sprout in February-March.
Where there is frost damage in winter, it should be planted in spring, in dry-hot valley area before the rainy season comes from May to June, and in low-heat valley area, it is warm in winter. Under the condition of water supply, the survival rate of 65438 ~/kloc-0 in late June 165438 in early October is also high. Container seedlings or transplanting with soil are not limited by season.
4. Density
Pomelo is a citrus tree with a high crown.
The plant spacing is 5×6m, and 22-27 plants are planted per mu. However, in order to improve the early yield and economic benefits, reasonable planning and close planting are often used in production. Add a row in the middle of the row spacing to make the row spacing 5×3m, and plant 44-54 plants per mu.
For example, grapefruit with compact crown (such as short late pomelo) has a row spacing of 3m and a plant spacing of 4m, with 56 plants per mu. It should be noted that some varieties (such as Shatian pomelo) need to be pollinated, and the ratio of main cultivated varieties to pollinated varieties can be 8- 10: 1.
5. Planting distance
After determining the planting site, dig1m×1m planting holes, apply 50kg organic compost and 3kg phosphate fertilizer to each hole, mix them evenly with soil, fill them into the holes, occupying the hole depth of 1/2-2/3, and then backfill the mature soil to avoid them.
When planting pomelo trees, we should pay attention to shallow planting, not too deep planting. The root system of seedlings should be trimmed, the injured root system and the excessively long root system should be cut flat, the root system should be spread evenly around and placed in the center of the planting pit, covered with fine soil, then the seedlings should be gently shaken up and down to make the fine soil enter the gap and closely connect with the root system, and then the soil should be filled and the root water should be filled. The planting depth must be such that the root neck is exposed to the ground, and the grafting point should also be exposed to the ground after the soil sinks after the seedlings survive.
Step 6 manage
After planting pomelo trees, straw can be covered to keep warm to prevent freezing at low temperature. In case of drought, 50% of leaves can be cut off to reduce water evaporation and improve the survival rate. Just keep wet with water before you survive. After survival, manure cleaning water should be applied 1-2 times a month to promote the growth of new roots, buds and shoots, and quickly form a high-yield crown skeleton, so that flowers can be seen in three years and put into production in four years.
Extended data:
1, look at the appearance first, and choose the one with a wide bottom and a pointed tip. According to Hualong. Com, grapefruit with a wide top and a wide bottom tastes better. If the neck above is longer, it means less meat and more skin. It is best to choose grapefruit with short neck, oblate shape and flat bottom.
2. Secondly, touch the peel and choose smooth and delicate skin. Good grapefruit skin is smooth and delicate, and the oil cells on the surface are translucent and shiny. At the same time, you should also press the peel. If it is not easy to press, it means that the pulp is tight and belongs to a good grapefruit with thin skin and plenty of meat. If you want to eat it right away, choose grapefruit with orange peel; If you want to store it for a while before eating, you can choose green and yellow skin.
Finally, it depends on the weight, and choose the one with small shape and heavy weight. According to the Health Times. Com, grapefruit with small shape and heavy weight contains a lot of water. For grapefruit with the same size, you should choose grapefruit with heavy weight, which is thin and watery and tastes more fragrant and sweet. If the individual is big and light, the skin is thick and the meat is small, and the taste is not good. In short, from the point of view of size and weight, grapefruit with a palm of three pounds is good.
Baidu encyclopedia-grapefruit
People's Network-Eat grapefruit in autumn, but do you know how to choose grapefruit?