Introduction of Management measures for late Autumn shoot Culture of Litchi

Autumn shoot is the fruiting mother branch of litchi, but not all autumn shoots can become excellent fruiting mother branches. according to the characteristics of flowering and fruiting of litchi and the law of climate change in litchi producing area, the autumn shoot produced at the end of August and the beginning of September should be used as fruiting mother branch. therefore, cultivating late autumn shoots as fruiting mother branches is the key measure to ensure high and stable yield of litchi. The following aspects should be grasped: 1. Timely fertilization during the period of late autumn shoot growth and development of litchi, it is necessary to apply shoot attacking fertilizer and strong shoot fertilizer in time. Shoot-tapping fertilizer was applied from mid-late August to early-middle September, mainly instant nitrogen and potassium fertilizer. For trees over 10 years old, 1.5 kg of urea and 0.5 kg of potassium chloride were applied to each tree, sprinkled after rain or sprinkled with water. Strong shoot fertilizer was applied from the middle and last ten days of September to the first and middle of October, mainly nitrogen, phosphorus and potassium compound fertilizer, 1.5 kilograms per plant, around the crown dripping line, digging ring trenches of 25 centimeters in depth and 30 centimeters in width, or retting 80 kilograms of mature human, livestock and poultry manure. In this way, the timely supply of sufficient nutrients can promote the growth of autumn shoots and promote strong autumn shoots. 2. Foliar topdressing during the late autumn shoot heading period of litchi, 0.1% magnesium sulfate, 0.2% urea, 0.3% potassium dihydrogen phosphate, 1000 triacontanol, 1500 times Shennong chelate fertilizer mixture must be sprayed once every 7 to 10 days, or 800x fruit tree special Gaomei liquid fertilizer solution should be sprayed continuously for 3 times 5 times to wet all leaves evenly, so that water droplets should begin to drop down. It is beneficial to promote the drawing of autumn shoots and to promote strong autumn shoots. 3. The late autumn shoots of litchi are easily harmed by felt disease, leaf curl moth, fine moth, poisonous moth, beetle, anthrax and other diseases and pests, which make the leaves wither, curl and fall off and reduce the quality of fruiting mother branches. During the period of late autumn shoot emergence of litchi, when the bud eyes are full, the late autumn shoots are to germinate, the late autumn shoots are just sprouting, and the late autumn shoots are just spreading leaves, each leaf is sprayed once with 1000 foliage, 800X methyl topiramate, or 1000 times an Lubao, 600x thunder domicil, or 1500 times enemy kill, 600x carbendazim mixture, spray and wet all the branches and leaves evenly, and it is appropriate to drop water droplets from the beginning. Eliminate all kinds of diseases and insects that harm the shoots of late autumn. 4. Truncated late autumn shoots when the late autumn shoots of litchi are all drawn out, the leaves turn light green, and the size of the leaves is basically fixed, the litchi is cut short by 1 shoot 4, that is, the terminal bud is removed from the top 2 or 3 new leaves, and the base shoot of 15 cm is retained. In this way, the basal shoot is nutritious, the leaf color is dark green, and the flower bud differentiates well, which lays a good foundation for a good flower spike in the second year. 5. Sprinkle cooked lime in the late autumn tip of litchi, after fully turning green and mature, sprinkle once cooked lime powder, each tree of more than 10 years old, about 3-4kg, spread evenly on the topsoil under the crown, preferably when the soil is wet after rain; if the autumn weather is dry and the soil is dry, you should first spray water to the tree plate to make the soil moist before spreading, so as to improve the effect of spraying.