1, plastic natural round head shape, commonly used in production a few days ago. The trunk is 50-60cm high, and 3-4 main branches are evenly distributed in all directions, and the branch angle is 45-50. Each main branch has 2-3 lateral branches. When the seedlings grow to 60-70 cm high, pick the core or cut the top at 50-60 cm. After the buds grow out, choose three branches with good directions and angles to keep as the main branches, and erase the rest.

2. There are two periods of fruit tree pruning: summer pruning and post-harvest pruning. (1) Summer pruning: from the beginning of inflorescence elongation to one month before harvesting, the inflorescences on the inner branches, transverse branches, weak branches and over-dense branches are thinned; Remove all summer shoots when they grow to 3-5 cm; Loosen the fruitless branches in the middle and upper part of the crown and block the light of the fruit. (2) Post-harvest pruning: from the beginning of the harvest period to the end of August, the branches that are too dense and have no fruiting ability, such as weak branches, drooping branches and aging branches, are thinned; Cross branches with the same shrinkage, decaying branches with shorter tips, vegetative branches and fruiting mother branches are longer; Retract or truncate the dense lateral branches in the middle, upper and top; Short or thin other branches that affect the tree shape and crown structure.

3. Water supply If the inflorescence is dry during the elongation period, water it properly to promote the differentiation and development of flower organs. If there is abnormal high temperature in flowering period, in addition to watering and moisturizing the orchard, you can also spray water on the canopy at10-0/2 in the morning and 3-5 in the afternoon to delay the wilting of stigma and promote the spread of pollen. Water the fruit immediately after it is solidified.

4. Lack of flower power is an important reason for low yield in small years. Chemical and pruning measures are often used in production to promote flowering. Mango flower promoters ⅰ and ⅱ are mostly used as chemical agents, and the application time is from 65438+February to February of the following year. Pruning measures include girdling, girdling, bending and twisting the branches of Wangwang in early and middle June of 5438, which can also promote flower bud differentiation. The methods of forcing flowers in the Philippines are as follows: ① smoking: if there is no flower bud in 2 weeks, it can be repeated in 1-2 months; ② Use 1%KNO. 1Spraying Harden110-month-old branches in mid-October, and flowering after 7 days (Sengent, 199 1). In recent years, it has also been reported that ethephon promotes flowering.

5. Adjust the contradiction between nutrition supply and demand, and leave 1-3 fruits per inflorescence, so that nutrition can be supplied centrally; In the early years, reduce the amount of spring fertilizer, control the spring shoots and wipe the summer shoots, and girdle or girdle the flourishing trees, so that the nutrients in the trees can turn into flowers and fruits.