2. Land preparation: under the condition of dry land, land preparation is carried out with a ridger, and the tillage depth is 50-90cm.
3. Grafting: introducing excellent red-heart pomelo scions, selecting local sour pomelo seedlings as rootstocks, and grafting method is single-bud cutting.
4. Planting: according to the specifications of plant spacing of 4.5 m× 6.2 m and 420-500 plants/hectare, dig pits for planting, the length, width and depth of each pit are 95 cm× 95 cm, and 2-3 loads of soil and miscellaneous fertilizer are applied to each pit, 25-50 kg of decomposed human and animal manure, 200-300 g of water-retaining agent and 0.5-0.5% of compound fertilizer. The cultivated red-heart pomelo seedlings were treated with root soil in root-fixing water for 30 minutes and naturally dried for later use.
5. Seedling treatment: dilute liquid fertilizer or manure water can be applied every month 15-20 days after grafting survival; Keep the scion 1 strong new bud, cut off the rest, and erase the germinated millet from the rootstock at any time; Unbind after 20-30 days to facilitate the healing and growth of grafted parts; Pay attention to sprinkling irrigation to keep the soil or nutrient mud moist; When the cork part of the new shoot stem of the scion is about 15 cm long, it can be planted out of the garden.
6. Shaping and pruning: The main task is to cultivate 3-5 evenly distributed main branches to form a circular umbrella crown with evenly distributed main side branches and firm structure. In the early stage, we should try our best to keep the branches, cut short the long vegetative branches and advocate multi-branching. When shaping, bamboo piles can be used to support the main branches and branches, and ropes can be used to hang them, so they must be evenly distributed, and the main branches and branches should not sink, which will not easily lead to roof infiltration in the future.
7. Management of flowering and fruiting period: The vegetative growth and reproductive growth of red-heart pomelo in fruiting period are carried out at the same time, which requires a lot of fertilizer and is topdressing for five times.
8. Field management: control spring shoots, erase summer shoots, protect leaves, flowers and fruits, dilute flowers and fruits after fruits are stable, enhance tree vigor, cultivate strong trees, bag small fruits, and use colored plastic bags or colored paper bags.