Temperature, humidity, light control technology
The temperature of a simple plastic greenhouse can be adjusted by uncovering grasshoppers and opening and closing vents. 20-30 days before the shed is covered with a tree disc, so that the ground temperature after the shed is increased by 2 °C ~ 3 °C. 20 to 30 days after the shed is covered, the mulch covers the grass at night to create a low-temperature environment, break the dormancy of the jujube tree, and begin to heat up in late January, and the temperature cannot be raised too quickly.
A gradual warming method should be adopted. Under the premise of covering grasshoppers at night, the first stage will pull up 2/5 grasshoppers during the day, and the temperature of the greenhouses will be kept at 8°C～12°C for 3 to 5 days; the second phase will be pulled. From 2/3 grasshoppers, the greenhouse temperature is kept at 10°C to 15°C for 3 to 4 days; every 3 phases pull up 4/5 grasshoppers, the greenhouse temperature is controlled at 10°C to 18°C, and the time is maintained at 3～ 5 days; after all the grasshoppers are pulled up, so that the indoor rapid temperature rise, the temperature before germination is controlled at 15 °C ~ 18 °C, night 7 ~ 8 °C. After germination, the temperature was controlled at 17°C to 22°C and nighttime at 10°C to 13°C.
The temperature during the leaf spreading period is controlled between 18°C ​​and 25°C and at night between 10°C and 15°C. The initial flowering period is 20°C to 26°C and nighttime is 12°C to 16°C. Flowering period 22 °C ~ 30 °C, night 15 °C ~ 18 °C. The fruit development period is 25°C to 30°C, and the film is gradually opened to adapt the jujube tree to the external environment. The relative humidity of air should be controlled at about 80% before flowering, the flowering period should be maintained at 50% to 60%, and the rest of the growing stage should be controlled at about 60%. Unless the drought is heavy, the ground water is generally not used. If it is necessary to fill the water, the water should be poured in the morning after preheating.
Zhanhua Dongzao is a light-loving tree species, and it can extend the lighting time appropriately. As long as the temperature is allowed, it can be opened as early as possible and covered in late.
Pollination and pest management techniques
Pollination at the flowering stage From the beginning of the flowering period, 1 to 2 boxes of bees are stocked in each greenhouse, and a flat plate is placed at the door of the beehive. Sugar water is added to the bees to pollinate the bees. At the same time artificially assisted pollination, in the morning 8 to 11 am after flowering, with a brush to teach flowers.
Timely opening jujube tree full bloom early in the trunk 20 cm away from the ground ring peeling width of 0.2 to 0.5 cm. Dry it 2 to 3 days after opening and then use a plastic wrap.
Strict fruit thinning, such as excessive fruit set, tree vigor can easily weaken. The amount of fruit should be determined according to the tree age, tree vigor, and the strength of the results. Generally, strong trees carry 2 young fruits per date, weak trees leave 1 young fruit, and all remaining fruits are removed. When fruit is thinned, it is best to choose the top fruit and fruit, and the amount of hanging fruits should be increased accordingly to increase the output.
The main pests and diseases in the pest control facilities are date rust, jujube anthracnose, red spider, and peach borer. After spraying the membrane, 5Be lime sulfur was sprayed one week later. 3Be lime sulfur was sprayed before germination to control overwintering diseases and insect pests. Afterwards, 1.8% avermectin EC was sprayed with 3000 to 4000 times liquid to eliminate red spider and peach. Insect pests and other pests; fruit growth period spray 50% carbendazim 1000 times or 70% thiophanate-methyl 800 ~ 1000 times 2 or 3 times, the last time in the fruit before 1 month, to prevent jujube rust, jujube anthrax disease.
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