Management method of peach tree in winter greenhouse
Winter pruning Winter pruning is carried out at the beginning of warming, and a spindle-shaped canopy is generally used. The structure of the tree body is a central trunk, with 12 to 15 fruiting branches in 4 to 5 layers. Use long-tip pruning, mainly sparse, not mid-cut. Dredging strong branches with an angle below 60 degrees and a diameter greater than 2 cm, thinning upright branches, diseased pests, and injured branches on the back of the main branches Light.
Soil and water management covers the ground with plastic mulch to increase ground temperature and soil moisture retention and reduce air humidity. Topdressing is usually carried out 2 or 3 times, mainly with fast-acting nitrogen, combined with phosphorus and potassium fertilizers. Irrigation is usually combined with topdressing. Spring starts before germination, after flowering, hard nucleus, and can be combined with topdressing irrigation 3 times. Depending on the drought situation in the future.
Temperature and humidity control Generally, the dormancy period of the peach is 40-50 days, and it needs a low temperature of 0 ° C to 7 ° C for 800 to 1200 hours, and the best temperature is 3 ° C to 4 ° C. From the beginning of November, covered with plastic film grasshopper to sleep in closed light, until the first half of December to meet the cold demand of peach, at this time the grasshopper can be exposed during the day to warm up. The relative humidity is controlled at 50% to 70%, the temperature is raised to 50% before flowering, the relative humidity is 30% during flowering, the fruit growth period is 60% to 70%, and the coloring period is 50%.
Greenhouse peach diseases and insect pests are mainly controlled by aphids and gray mold. Aphids should be cleaned 1500 times, gray molds should be washed 1000 times, and sprayed with 5-7 degrees of stone sulfur mixture once before germination. Spray 7 days before flowering. To control aphids and red spiders, the peach leaf moth is controlled by spraying with 1500 times solution of mirexyl urea 3.
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