(1) Seedling breeding ① Seedling propagation: it is widely used at present, but there are variations in offspring. The big seeds with fully developed fruits in the lower part of the trunk germinate well. Seeds are easy to lose germination ability, so they should be washed and dried, stored in wet sand or sown immediately. After seed storage15 days, the germination rate was 70%. After 30 days, it dropped to 40%. Use 500 mg/L gibberellin before sowing. After soaking seeds for 48 hours, the germination rate of 100% (Sanmugavelu, 197 1) can be obtained, and the seedlings grow well. Seeds are layered with wet fine sand to accelerate germination. When radicles are exposed and buds germinate, they can be moved into seedling bags or nurseries to raise seedlings. (2) High-pressure propagation: it is rarely used at present and has the advantages of dwarfing plants, convenient management, early fruiting and good seed quality. The disadvantage is that it has no roots and is not wind-resistant. (8) Grafting propagation: Patch budding method is often adopted, and buds of one-year-old cork or semi-cork branches are selected for budding. When using this rootstock, we should pay attention to the influence of pineapple milk on the survival of bud grafting. Before bud grafting, we can cut 1 knife above the bud grafting position to remove the milk. The grafting period can be carried out except in rainy and cold seasons, and the grafting position should be low. (4) Cutting: 30 days before cutting, ring cutting and yellowing are carried out, and 2000 mg/L ferulic acid +3000mg/L is used before cutting. 90% hairy roots can be obtained by IBA rapid soaking method. 1983).(2) Because of the large crown, ventilation and light transmission are easy to get pests and diseases. The planting period is mostly in June, and the plant spacing is 5 m× 7 m. If it is too dense, the branches are few and weak, and when it is hot and rainy, the seedlings will grow fast. Before the arrival of the low temperature and dry season, the seedlings have recovered their vitality and can grow rapidly in the next year. When transplanting seedlings, it is necessary to avoid damaging the main roots. If white latex juice flows out after injury, the survival rate of seedlings is low. In this case, farmers often burn their mouths with fire, so that the chewing gum will solidify and stop flowing to avoid water loss. After planting, we should protect young branches and leaves, avoid pests and diseases and animal damage, and pay attention to irrigation, antifreeze and strengthen tree tray management. Young trees need proper shade environment, and short-term fruit trees such as pineapple and banana can be planted between rows. (3) Fertilizing farmers mostly plant in front of the house and behind it, and seldom fertilize in 1. However, due to lush plants, many fruits and high nutrient consumption of trees, at least 1 times fertilizer should be applied to supplement nutrition before flowering and fruit storage. Before flowering, 1 February, apply fertilizer in the open-loop ditch under the crown, with organic fertilizer as the main ingredient and compound fertilizer as the auxiliary ingredient. After applying fruit fertilizer at the end of July, apply it in shallow holes with available nitrogen and potassium fertilizer as the auxiliary ingredient. (4) In order to promote the flowering and fruiting of pineapple, farmers often smoke near the tree head to increase the concentration of co and increase the accumulation of photosynthetic products; Or cut the trunk with a knife to cause bleeding (in order not to hurt the xylem) to achieve more flowers and more fruits. View original post >>