Method for watering green seedlings

The requirement for water is strict, which is characterized by being full of wetness and waterlogging. The soil grows well when it is wet, otherwise it will not grow well. Ginkgo biloba seedlings will all die if they are soaked in water for 3-4 days. Therefore, in the production process, we should pay special attention to the watering and drainage of ginkgo biloba. (1) Watering principle: From the perspective of the growth process of Ginkgo biloba, we should master the principle of mainly watering in spring with a small amount of water for many times. Spring is the key period for watering ginkgo biloba, and the new shoots of ginkgo biloba stop growing from the end of June to the beginning of July. It is the key period of water demand for Ginkgo biloba from before and after germination to before and after wheat harvest. However, this period is usually a dry season with little rain. Therefore, it is necessary to water frequently to keep the soil moist and keep the soil water content at 60%-80% of the maximum field capacity. The peak period of ginkgo seed growth and development is from late June to late July, which requires a lot of water. Generally speaking, however, this period is the rainy season. If the weather is dry, be sure to water it, otherwise it will affect the growth and development of ginkgo seeds and reduce production. After autumn, before the soil freezes, Ginkgo biloba needs less water than in spring, so it is generally not watered unless it is particularly dry. Before the soil freezes, it is usually necessary to burn frozen water once. Ginkgo biloba picking garden is watered more than fruit garden, so it should be watered as long as it is dry before the end of September. (2) Irrigation method: At present, flood irrigation is widely used in most areas of China. The disadvantages of this irrigation method are wasting water, destroying soil physical and chemical properties, serious nutrient loss and short effective utilization period of soil moisture, which is not conducive to the growth of Ginkgo biloba. Reforming irrigation methods is an important technical measure to save water and use water scientifically. According to the growth characteristics and production practice of Ginkgo biloba, the best water cleaning methods are sprinkler irrigation and micro-spraying, which can increase the growth of Ginkgo biloba. Therefore, places where conditions permit should vigorously promote sprinkler irrigation, drip irrigation and micro-sprinkler irrigation. Where conditions are not available for the time being, flood irrigation should also be changed to hole irrigation or furrow irrigation. ① Cave irrigation: it is suitable for "four sides", intercropping, farmland shelterbelt, urban greening and other cultivation modes. The specific method is: Dig irrigation holes with diameters of about 25 cm and 30 cm at the outer edge of the crown. Irrigation holes are evenly distributed along the tree crown. The general requirement for the number of digging holes is to ensure that more than 40% of the soil in the root distribution area is kept at 60%-80% of the maximum water capacity in the field. Generally 3-4-year-old trees, each with 2-3 holes; Results 3-4 holes per plant in early stage: 4-6 holes per plant in full fruit stage. After digging the hole, fill it with water. After all the water seeps down, fill the hole with soil immediately and flatten the tree. ② Gully irrigation: suitable for orchards, leaf gardens, high-yield forests and intercropping. The specific method is: dig a ditch with a depth of 20-25 box meters and a width of 30-40 cm between rows along the tree. Number of ditches According to local experience, a ditch can be dug at 100- 120 cm. The furrow ratio is reduced to11200. Excessive slope is easy to uneven irrigation. When filling water, the ditch shall prevail. Fill the ditch in time after water seeps out.