Transplanting cultivation techniques and management of Pinus bungeana
In the process of transplanting, Pinus bungeana transplanted with soil in big holes has strong drought resistance, drought resistance, barren resistance and cold resistance. It is the main conifer species that can adapt to calcareous loess and mild saline-alkali soil. But it grows most luxuriantly in deep fertile, sunny, warm and well-drained places. Before transplanting, the transplanting pit can be dug deeper and larger, which is beneficial to improve the small environment around the seedlings in the nutrition bag. At the same time, because it is a nutrient bag seedling, when transplanting, the nutrient bag should be cut with a knife from top to bottom to facilitate the root system of the seedling to protrude from the bag as soon as possible, thus shortening the slow seedling stage and making the seedling enter the normal growth period. Pouring enough water to ensure the survival of seedlings when transplanting, 200 seedlings of Pinus bungeana were selected, of which 100 seedlings were watered with 2 water before transplanting, and the rest 100 seedlings were watered with 0.50 kg water. The survival rate of Pinus bungeana seedlings irrigated with 2 kg water can reach 99%, while the survival rate of seedlings irrigated with 0.50 kg water is only 55%. It can be seen that watering the soles of feet is one of the key measures to ensure the survival of seedlings during transplanting. Cultivate and manage proper water and fertilizer management and strengthen intertillage. According to the author's observation, Pinus bungeana seedlings can enter the growth period earlier as long as they are watered once after spring, and their leaves turn green about 15 d earlier than those without watering. Fertilization can be done 2 ~ 3 times a year, mainly nitrogen fertilizer. The first fertilization should be carried out when the seedlings begin to grow and stop after the seedlings stop growing at a high speed. Field management should be strengthened at least four times a year after transplanting. Herbicide (herbicide) can seal the soil by spraying seedlings between rows. Be careful not to spray chemicals on the seedlings. Stretch branches, shape, and increase aesthetic feeling. Because the cultivated seedlings are mainly used for urban landscaping, beautiful tree shape is very important. The growth of Pinus bungeana is slow, so it is necessary to carry out artificial pruning and shaping as soon as possible. In the second year after transplanting, the growth of seedlings should be observed frequently, and the lateral branches should be shaped by pulling branches, mainly in tower shape, dome shape or scattered shape. Before transplanting seedlings, it is necessary to improve the small environment of seedlings in nutrient bags by means of large holes and whole pits. Cutting 2 ~ 3 holes from top to bottom with a knife is beneficial to stretching the root system of seedlings as soon as possible and shortening the slow seedling stage. At the same time, watering the soles is one of the key measures to ensure the survival of seedlings. After transplanting, the management of water and fertilizer is relatively simple, and it is enough to water 1 time after spring, and the leaves turn green about 15 d earlier than those without watering. Fertilize 2 ~ 3 times a year, mainly nitrogen fertilizer. After lodging, the seedlings stop growing at a very high height, so there is no need to fertilize. However, we should continue to strengthen on-site management. In the future management process, the lateral branches should be shaped according to the purpose of seedling raising, mainly in tower shape, dome shape or scattered shape.