First of all, we should choose sandy loam with good drainage and irrigation system. Planting density of winter jujube trees is 1 m, row spacing is 2m, and 333 trees are planted per mu. The greenhouse is a north-south arched greenhouse, built of bamboo and supported by reinforced concrete columns. The span is 8 ~12m, the drop is 3.2 ~ 3.5m, and the length varies from place to place, generally around 60m. The drip-free film is selected as the shed film, and stubble is pressed between the films. In the middle of every two arches, press it with a film pressing line. A movable gap can be left as a vent at the stubble pressing position of two shed films on the shed shoulder.

2, buckle shed and shed

After a period of natural dormancy, from the end of February to the beginning of 10, 65438, base fertilizer was applied, 50 kilograms of organic fertilizer was applied to the plants, and water was filled. The tree tray was covered with plastic film, and then the plastic film was buckled. The harvest period begins in the first half of September, and the outdoor air is released about 10 days after the harvest period, and then the film is uncovered. After uncovering the shed, it is still necessary to strengthen soil, fertilizer and water management and pruning of winter jujube, increase tree nutrition and cultivate tree shape.

3, temperature, humidity, light control

The temperature of simple plastic greenhouse can be adjusted by uncovering grass and opening and closing vents. The ground temperature increased by 2 ~ 3℃ 20 ~ 30 days before the shed was closed. 20 ~ 30 days after the shed was closed, the straw curtain was removed at night to create a low temperature environment and break the dormancy of jujube trees. In late June, the temperature began to rise in 65438+ 10, so it is not advisable for the temperature to rise too fast. The temperature should rise gradually. On the premise of covering the grass at night, in the first stage, 2/5 of the grass was pulled up during the day, and the greenhouse temperature was kept at 8 ~ 12℃ for 3 ~ 5 days. In the second stage, pull up 2/3 of the grass and keep the greenhouse temperature at10 ~15℃ for 3 ~ 4 days; Pull up 4/5 of the straw cover every three stages and control the greenhouse temperature at 10 ~ 18℃ for 3 ~ 5 days; After that, all the straw mats were pulled up to make the indoor temperature rise rapidly. The temperature before germination was controlled at 15 ~ 18℃, and the temperature at night was controlled at 7 ~ 8℃. After germination, the temperature is controlled at 17 ~ 22℃, and at night 10 ~ 13℃.

The temperature is controlled at 18 ~ 25℃ during the period of branching and leaf spreading, and at night it is controlled at 10 ~ 15℃. The initial flowering period is 20 ~ 26℃, and at night 12 ~ 16℃. The flowering period is 22 ~ 30℃, and at night 15 ~ 18℃. The fruit development period is 25 ~ 30℃, and then the film is gradually uncovered to adapt the jujube tree to the external environment. The air relative humidity should be controlled at about 80% before flowering, 50% ~ 60% during flowering and 60% during other growth periods. Unless the drought is severe, surface irrigation is generally not carried out. If irrigation is really needed, the water should be preheated and watered in the morning. Zhanhua Dongzao is a light-loving tree species, and the illumination time can be appropriately extended. As long as the temperature permits, it can be uncovered early and covered late.

4, plastic pruning

Choose free spindle shape or small crown sparse layer shape. In order to facilitate management, the stem can be properly raised, but not more than 50 cm. Choose 3 ~ 6 robust branches as the main branches, and reduce the height of the tree by pulling branches, supporting branches and dropping branches, preferably 30 ~ 40 cm lower than that of plastic film. Shorten the developing branches, sparse the over-dense branches, pests and diseases, thin and weak branches, retract the fruiting branches and vigorous trunk branches, and update the fruiting branches to ensure the compact and short trees. Pruning is mainly in the growth period, mainly because the jujube head is pitted and diagonally crosses the small main branch or big branch.