(1) The short late pomelo is selected for late ripening in the garden, and the fruit is hung on the tree for overwintering. Suitable annual average temperature 17.5 ~ 20℃, extreme low temperature above -3℃, annual active accumulated temperature ≥ 10℃ or above 5500℃, and fertile and loose soil. Paddy fields should be planted in plots with good drainage, and deep ditches should be opened for drainage.
(2) The prepared rootstocks with Fructus Aurantii and sour pomelo as rootstocks have good compatibility, and the rootstocks of Fructus Aurantii bear early fruits with high and stable yield. The sour pomelo rootstock bears fruit a little later than the bitter orange rootstock, but the yield is higher in the later stage.
(3) Soil improvement and fertilization should be carried out before the soil in the civil garden can not meet the requirements, and the soil that has no time to improve should be completed within 3 years after planting. Before planting, dig a pit (ditch) and apply sufficient base fertilizer, with a pit depth of 0.8m and a width of 0.8 ~ 1.0m, and apply green manure, straw and manure. As base fertilizer, 30 ~ 50kg of calcium superphosphate or 2kg of calcium magnesium phosphate (acid soil) are mixed with soil layer by layer, and the backfill soil is used to raise the pier (0.2 ~ 0.2). After planting, with the growth of trees, the holes are enlarged year by year, and the soil is improved year by year, which is completed within 3 years, laying the foundation for high yield of plants.
(4) The planting density is low, and the late pomelo tree is short, so it should be planted closely. Usually, the planned row spacing of close planting is 2m× 3m, which means planting 1 12 plants every 667m. After 6 ~ 8 years, 1 plant can be removed by pruning and crown control, and the plant spacing is 3 m× 4 m, that is, 56 plants are planted every 667 m. Short late pomelo can bear fruit in the third year or even the second year after planting.
(5) Fertilizer and water management. Late pomelo bears early fruit and has high yield, so the management of fertilizer and water should be strengthened. Young trees are "two fertilizers at one tip", with emphasis on the bud. 1 Spraying 0.2% ~ 0.3% urea and potassium dihydrogen phosphate 2 ~ 3 times a year. Micro-fertilizer is suitable for trees, and organic fertilizer is the main base fertilizer, which is applied in winter. Fruit trees 1 year should be applied with spring bud fertilizer, fruit stabilizing fertilizer, strong fruit and shoot promoting fertilizer and overwintering fertilizer. 0.8 ~ 65,438+0.0 kg of pure nitrogen, 0.4 ~ 0.6 kg of phosphorus pentoxide and 0.6 ~ 0.8 kg of potassium oxide were applied to the plant, and the yield was 65,438+000 kg. Spring bud fertilizer, fruit stabilizing fertilizer, strong fruit fertilizer and overwintering fertilizer account for 10%, 20%, 30% and 40% of the annual nitrogen application rate, respectively. Spray 0.3% potassium dihydrogen phosphate when each secondary tip changes color. According to the climate, when the tree needs water, especially when the fruit is swollen, it should be watered in time.
(6) The shaping of young trees requires low stems, short crowns and few main branches. (3) There are many branches and pruning should be light.
(7) The order of thinning flowers and fruits should be thinning inflorescences first, then buds, and finally fruits. Sparse inflorescence refers to a weak leafless inflorescence with a sparse turn-around tail from the mother branch of 1 inflorescence, leaving only about two strong inflorescences in the middle of the mother branch.
Bud thinning should be carried out when the bud turns white (soybean size), so it is easy to judge the quality and deformity of the bud. When shaping and pruning, we should remove abnormal buds, buds that are too small and too dense, and buds at the head and tail, leaving only about three healthy buds in the middle. At the same time, it is also possible to properly remove some excessive spring shoots of pomelo trees during the growth and fruiting period, and properly remove some delicate spring shoots of pomelo trees during the full or weak fruit period, so as to reduce nutrient consumption, concentrate nutrition on robust flowers and improve the fruit setting rate.
Fruit thinning should be carried out after the second fruit drop. For three or more fruits planted on the fruiting branches, malformed fruits, small fruits and dense weak fruits with poor development should be thinned out, and strong fruits should be kept. Strong trees stay, weak trees stay less. The amount of fruit left should be flexibly mastered according to the nutritional status of the tree, the distribution of fruit in the crown and the level of cultivation management. In the full fruit period of "Ye Nan pomelo" close planting garden, every 667 m planting 1 12 plants, the average yield per plant 15 plants, and the fruit 1680 plants, calculated as per plant 1.5kg, the yield is 2,520kg.