How to manage Ginkgo biloba seedlings by topdressing, drought, drainage, disease control and pest control

In the management of sowing and raising seedlings of Ginkgo biloba, we should pay attention to the following four links.

Ginkgo seedling

First, fighting drought and waterlogging. When most of the ginkgo seeds are unearthed, they should be irrigated in time. Because its seedlings grow slowly, the annual seedlings are only about 20 cm high, coupled with poor root development, neither drought resistance nor waterlogging resistance, the northern region should be watered according to the drought of the seedling bed, and the southern region should strengthen drainage management according to the weather conditions.

Second, topdressing at the right time. Ginkgo biloba seedlings emerged late (early and middle May), stopped growing earlier (early September), and the seedling growth period was short. The first fertilization should be in early June, combined with watering, with urea 5 kg per mu. It is safer to use dilute human feces and urine retted through. The second time is in early July, the third is in late July, and the fourth is in early August. The amount of urea can be added 2 to 3 kg in turn to ensure the nutrition needs of seedlings, and the third and fourth times can appropriately increase phosphorus and potassium fertilizer or compound fertilizer to increase the cold resistance of seedlings.

Third, disease prevention and pest control. Because the roots of its seedlings are very young, they are vulnerable to underground pests such as grub, mole cricket, golden needle worm and ground tiger larvae. if they occur in a large area, 1000 times phoxim can be sprayed on the ground, and targeted spraying can be done if they occur locally. In the high temperature and rainy season from June to August, the seedlings are prone to stem rot, and the pure sandy soil is easy to cause a large number of seedling death due to the rapid increase of surface temperature and high morbidity, but the sandy loam is basically free from the disease. the prevention and control measures are to carry out intermediate ploughing and weeding in time in summer, and do not touch the seedling stem, and special attention should be paid to keeping the seedling bed moist in the high temperature and dry season. After discovering the diseased plant, it is necessary to pull out and burn it in time. During the seedling period, 2% to 3% ferrous sulfate is sprayed every other month, and the effect is better. In addition, excessive soil moisture or severe drought will cause early defoliation of seedlings, affecting the growth of seedlings, which should be prevented.

Fourth, expand the distance and transplant. Ginkgo biloba seedlings grow slowly in the first 3 to 4 years, and accelerate after four years. Generally, only seedlings with a height of 2 to 3 meters and DBH of 3 cm can come out of the nursery. For this reason, it is necessary to carry out the necessary transplanting. For example, seedlings with a height of 3 to 4 meters and DBH of 3 to 4 cm must be cultivated for 4 to 6 years. The density is 800 to 1000 plants per mu, and the row spacing is about 0.8m × 1.0m or 0.5m × 1.2m. Seedling transplanting can be carried out from late November to the following spring, the transplanting land requires convenient drainage and irrigation, and apply enough agricultural and miscellaneous fertilizer. When transplanting, we should pay attention to rising, transporting and transplanting, ensure that the root system is intact, continuous root, non-splitting, and protect the terminal bud, irrigate thoroughly after transplanting, and apply fertilizer 3 times a year, in May, July and October respectively.