Can you grow grapefruit in the north?

Pomelo can not be planted in the north, because pomelo should grow in an environment of warm and humid, deep and fertile soil and abundant water, while the temperature in the north of our country is low, which is not suitable for the growth of pomelo, even if the grapefruit tree can survive, it will not bear fruit.

The temperature in the north is cold, and grapefruit likes to grow in a warm and humid environment. The soil for growing pomelo is required to be deep and fertile, and the water quality, fertilizer and water source are sufficient, so it is impossible to grow grapefruit in the north. If grapefruit is planted in the north, even if the seedlings survive, it won't bear fruit.

Planting techniques of pomelo

I. colonization

1. Density: grapefruit trees grow relatively fast and have a large crown. Grafted trees generally reach full fruit period in 6-7 years, and the density should be suitable when planting. If it is planted on a slope above 20 degrees, the density should be controlled at 45 trees / mu. If planted on a gentle slope below 10 degrees, the density should be controlled at 35 trees / mu.

2. Time: when there is more rainfall in spring and autumn, it is best to plant grapefruit trees. Generally, you can choose to eat from the end of February to the end of April and from mid-August to mid-October. If conditions permit, except during the periods of low temperature in winter and summer drought in summer, grapefruit can also be planted at other times.

3. Density: the plant spacing and row spacing of pomelo should be 4 × 4m or 4 × 5m, and the density should be controlled at 40 plants / mu. If the seedlings are short, the planting density can be increased appropriately, and the best density should be controlled at 50-60 plants / mu.

4. Methods: first dig a 1m square pit, spread enough organic fertilizer and appropriate amount of phosphate fertilizer into the pit as base fertilizer, then pile the soil 20-30cm higher than the ground, then put the grapefruit seedlings lightly in the pit, plant them with loose crushed soil, and then compact the fine soil around the root mass by hand, and the grafting interface should be exposed to the ground. After setting the value, the nest plate should be arranged, which is higher than the ground 20cm, and then irrigate enough fixed root water.

II. Soil tillage

1. Deep ploughing: the soil in the garden is deeply turned, and the area is expanding year by year. In the young pomelo tree stage, a circular trench can be dug outside the planting area, and deep ploughing can be carried out year by year. The adult grapefruit plantation can dig wide 70cm and deep trench in the periphery of the crown, deep trench of deep 50cm, fill organic manure and inorganic fertilizer into the ditch layer by layer, or turn over every other year, every row or each plant alternately.

2. Large kinds of green manure: covering large kinds of green manure on the ground in summer can prevent it from being washed away by Rain Water, reduce the soil temperature, increase the humidity in the air, restrain the growth of weeds, and increase the content of organic matter in the soil to a certain extent. enhance soil fertility. If legumes or vegetables are planted at intervals in the garden, it can also increase economic benefits. after harvest, their stems and leaves can be covered and turned into the middle of the soil to improve the soil.

3. Intermediate ploughing: weeding is carried out at the same time, 3-4 times a year, usually after fruit is harvested in winter, in summer or autumn, combined with sowing and intercropping. The depth of intertillage is controlled at about 10-15cm. If intercropping is combined with sowing, the depth can be a little deeper, and the closer it is to the trunk, the shallower it is, so as to avoid damage to the big roots of fruit trees.

It is best to cultivate the soil before the dry season or after picking the fruit in winter. If the orchard is on a gentle slope, the soil can be cultivated once every 3-4 years. If it is in a place with a larger slope and is vulnerable to erosion, it is best to cultivate the soil every other year.

III. Fertilization

The roots of young grapefruit trees are relatively young, so it is necessary to apply more fertilizer in planting, according to the principle of a small number of times, generally 5-6 times a year, and the fruit trees can be fertilized about 4 times a year.

1. Base fertilizer: also known as returning yang fertilizer, it is generally carried out before and after picking fruits, and the amount of application accounts for half of the whole year, mainly applying green manure, compost, circle manure, cake fertilizer and other slow fertilizer, but also combined with the application of available nitrogen fertilizer and phosphate fertilizer.

2. Pre-flowering fertilizer: it is also a budding fertilizer, which is carried out from February to March, mainly applying quick-acting nitrogen fertilizer, which can be applied to human and animal manure, and can be properly combined with urea.

3. Stable fruit fertilizer: half a month before fruit drop in June, apply some quick-acting nitrogen and phosphate fertilizer, or spread rotten human and animal manure and spray 1% superphosphate leaching solution.

4. Strong fruit fertilizer: most of them are carried out in the middle and last ten days of June, mainly spreading available nitrogen fertilizer and phosphorus and potassium fertilizer.

IV. Irrigation and drainage

The leaves of pomelo trees are green all the year round, their branches grow a little bit more, melons and fruits take a long time, and their leaves and fruits are relatively large, requiring sufficient water. When growing grapefruit, the orchard should be irrigated regularly to ensure the water needed for the growth of the fruit tree, depending on the growth of the grapefruit tree.

Pomelo trees need sufficient water to maintain their growth throughout the year, especially during the peak periods of spring bud, flowering and fruit growth. If spring and summer droughts occur in the planting areas, orchards should be irrigated in time. If the terrain is low, where the groundwater table is high and the rainfall is high, the water in the garden should be discharged in time, and the drainage system in the garden should be checked regularly. If problems are found, Correct it in time to ensure the smooth drainage of the orchard.

5. Shaping and pruning

The grapefruit tree grows faster, the fruit tree is tall, as long as there is enough fertilizer and water in the young tree stage, their top advantage is also very strong, the branches grow slightly straight, the tree-shaped trunk is obvious, and the new ones on the fruit trees are a little more and very strong. as a result, the branches droop because of the heavy protection of the fruit, and the branches bend downwards. at this time, the tree will become umbrella-shaped, and the sun will not easily fall into the inside of the crown, which will make the branches grow poorly and the fruit will be small. In general, the fruiting mother branches of grapefruit trees are inside the crown and are biennial leafless branches.

According to the growth and fruiting characteristics of pomelo trees, it is best to prune the fruit trees after planting, and it is appropriate to adopt "variable side trunk shape" and natural "happy shape". Generally, the dry height is controlled at 40-60cm, and the interval between main branches is controlled at 30-40cm. A total of 5-6 main branches can be cultivated.

When pruning the grapefruit tree, we should mainly "top heavy, square light, outer heavy, internal light", sparse pruning where the branches and leaves are dense around the crown, heavy pruning the branches at the top, and trimming the branches inside the fruit tree a little, so that there is enough sunshine inside the crown to improve the yield and quality of the fruit.

Generally speaking, the slender leafless branches on the 3-4-year-old side branches inside the crown are excellent fruiting mother branches, which should not be pruned, and the outside of the crown is too long or disturbs the shape of the tree, which affects the balance of the tree potential, they should be thinned and cut short to achieve the purpose of ventilation and ventilation.