Poplar is widely used in intensive cultivation because of its characteristics of early fast growth, strong adaptability, wide distribution, variety and variety, easy hybridization, easy improvement of heredity, and easy asexual reproduction. Poplar cultivation has been developed in many places in recent years. However, many farmers only pay attention to the management of the growing season of poplars and ignore the winter management. The author believes that winter management of poplars cannot relax.
First, increase organic fertilizer. In the late autumn and early winter, the ditch is 50 to 100 cm away from the base of the trunk of Yang. It is generally 20 to 30 cm wide, 20 to 30 cm deep, and 100 cm long. After the ditch is opened, the farmyard manure is filled in the ditch, and the fertilizer amount is determined according to the age of the tree and the size of the tree body, and then the soil is covered. You can open each groove in the opposite direction.
Second, trim. Poplar pruning should take into account both quality and high yields. Young forests should be lightly pruned and heavy crowns should be kept to compete for branches and keep their branches. Small poplar trees should not be heavily pruned so as not to weaken the tree and inhibit growth. Usually 1 to 3 years old poplars make a small amount of plastic pruning and keep straight trunks. From 4 to 5 years old, poplars are pruned to 1/3 of the tree height, and after 6 years, they are pruned to 1/2 of the tree height. When the last branch is 6 to 8 meters above the ground, the pruning can be stopped, and no knots can be obtained.
Poplar sprouting ability, often after the pruning will grow a large number of sprouting in the lower trunk, it should be promptly trimmed to avoid large consumption of nutrients. Poplars should be kept close to the trunk without pruning. Trimming rough branches should be done with a pruning saw. A shallow mouth should be sawed under the side branches and then sawed from above to prevent tearing of the bark when the side branches break. Saw mouth should be coated with "wounding anti-corrosion film" closed to reduce the loss of water and pests.
Third, clean the leaves. Understory leaves are the overwintering sites for most leaf-eating pests and leaf diseases. Therefore, timely removal of under-forest, road-side defoliation, eradication of weeds, and centralized burn-up after cleaning can effectively kill overwintering mites and pathogens.
Fourth, the trunk is painted white. Whitening the trunk with a whitening agent can eliminate overwintering pests in the gaps between the bark, reduce frostbite and protect against pests and diseases. The method of preparing white lime sulfur coating: 12 parts of quicklime, 1 part of salt, 2 parts of flour, 3 parts of lime sulfur mixture stock solution, and 40 parts of water, and the whitening agent is prepared after stirring. When you paint white, you should choose sunny weather. The temperature should be above 2°C to prevent the whitening agent from forming ice.
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