T/AFFI 021-2021 Winter jujube cultivation techniques specifications for facilities

Scope

Main technical content: Winter jujube cultivation techniques, including the following steps: 1. Comprehensive temperature and light effects in solar greenhouses, with arched-round energy-saving greenhouses being the best option. The north-south span is 10m–12m, and the east-west length is 60m–80m; the front and rear slope projection ratio is 6:1; the roof angle for light exposure is 27 degrees; the ridge height is 4.8m; the rear wall height is 3m; the rear slope angle is 50 degrees, and the rear slope length is 2.4m; the composite wall thickness is 1.0m; bamboo-wood structures or steel frame structures, or hybrid structures of bamboo-wood and steel. Suitable for winter production without heating facilities. 2. Planting density and timing: Winter jujube trees have vigorous growth in their early stages, with annual jujube shoot growth reaching 0.6–1.3m. However, mature fruit-bearing trees have open crown shapes and weaker growth. Moreover, winter jujube trees develop secondary branches that bend, and fruit-bearing branches fall off each year, leading to underdeveloped secondary buds that fail to extend the following year. Based on these characteristics, winter jujube belongs to the "short-branch type" and can be cultivated with high planting density. Therefore, three planting methods can be adopted: row and column spacing of 1m×4m, 1.5m×4m, and 2m×4m, all of which have high early yield, stable tree growth, and easy management. The survival rate of winter jujube planted in autumn (November) is about 80%, and that of spring (late March to early April) is about 90%, with higher survival rates in spring. However, observation shows that although the survival rate in autumn is slightly lower than that in spring, the growth of the trees in autumn is better than that in spring, due to faster root healing in autumn. 3. Planting method: Dig planting holes 30cm deep and wide in rows and columns within the planting pit/trench. Place the seedlings in the center of the hole,

Development Information

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