How to manage the peach trees in the greenhouse in winter?
Winter pruning: Peach trees in greenhouses are pruned in winter at the early stage of heating, generally using a spindle-shaped crown. The tree structure is a central trunk with 12 to 15 fruiting branches in 4 to 5 layers. Pruning with long tips, mainly sparse, not in the cut. Thin out strong branches with an angle of less than 60 and a diameter of more than 2 cm on the main trunk and the central trunk, and remove the upright branches, diseased and injured branches on the back of the main branch, but the height of the tree must be controlled to facilitate ventilation and light transmission .
Soil, fertilizer and water management: The peach trees in the greenhouse are covered with plastic film at the beginning of the temperature rise to increase the ground temperature and preserve moisture, and reduce the air humidity. Top dressing is generally carried out 2 to 3 times, mainly with available nitrogen, combined with phosphorus and potassium fertilizers. Irrigation is generally combined with top dressing. In spring, before germination, after flowering, and the beginning of hard core, it can be combined with topdressing to irrigate 3 times, and then it can be determined according to drought.
Temperature and humidity control: temperature. Generally, the dormancy period of peaches is 40-50 days, requiring 800-1200 hours at a low temperature of 0℃~7℃, with 3℃~4℃ being the best. From the beginning of November, the grass thatch is covered with plastic film and sleeps without light, and the cold demand of the peach can be met in the middle of December. At this time, the grass thatch can be lifted and warmed up during the day. humidity. The relative humidity is controlled at 50%~70%, and the temperature is increased to 50% before flowering, 30% relative humidity during flowering, 60%~70% during fruit growth, and 50% during coloring.
Pest control: The main pests and diseases of greenhouse peaches are aphids and gray mold. Use 1500 times to clean aphids, 1000 times to clean gray mold, and spray 5~7 degree lime sulfur mixture once before germination, 7 days before blooming. To prevent and control aphids and red spiders, the peach leaf miner uses the 1500 times liquid spray of diflubenzuron No. 3 for control.
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