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Second, the growing season timely underground fertilizer. The method of fertilization is to open a 5-10 cm deep ditch between the rows and apply the fertilizer to the ditch. Water immediately after fertilization. (1) Leaf collection garden. Fertilizer 3 times a year underground: for the first time around 10 days before germination, urea 20-25 kg per acre; the second before the peak growth (mid-May), 25 kg of urea per acre; In the first half of August, 20-25 kg of compound fertilizer was applied per mu. (2) Result Park. Ginkgo biloba fruit gardens have different ages due to their ages. The results are more or less, the tree vigor is strong or weak, and the storage and nutrient levels of the trees are complicated. Therefore, the top dressing should be adapted to the local conditions. The saplings (before the result) are topdressed twice a year: for the first time in the middle of May, urea is applied at 10-15 kg per mu; for the second time from late August to early September, 15 kg of compound fertilizer per acre is applied. . The results tree top dressing 4 times a year: the first time in about 10 days before germination, 25 kg of urea per acre; the second time in 7 days before the peak of new shoots (in mid-May), urea per acre 15- 20 kg, 15 kg of potassium dihydrogen phosphate; the third time from late July to early August, 20 kg of compound fertilizer per acre; the fourth time in mid-September, about 15 kg of compound fertilizer per acre.
Third, auxiliary foliar fertilizer. According to the growth and development characteristics of Ginkgo biloba, the whole year can generally be sprayed 6 times; the first time in early spring about 20 days before germination, spraying 3-5% urea solution once, can effectively solve the early spring soil temperature is low, the root system Late activity and poor absorptive capacity; the second time around 15 days after germination, spraying 0.2% urea solution can promote the growth of young leaves and increase the photosynthesis of leaves; the third time in mid-May, spray 0.5% urea solution. It can mainly accelerate the growth of new shoots and increase the growth of shoots; the fourth time in mid-June, spray 0.5% urea solution to promote new shoot growth and flower bud formation; the fifth time in early July, spray 0.3% phosphoric acid Potassium dihydrogen solution can prolong the growth period of new shoots and promote the formation of flower buds. In the sixth time, in late August, 0.4% potassium dihydrogen phosphate solution is sprayed to increase the photosynthetic function of leaves and the fresh weight of single leaves to promote fruit growth. development.
Ginkgo fertilization techniques
First, in the autumn, organic fertilizer and compound fertilizer are applied in the hole. The hole is applied in the area around the canopy or in the tree tray. Dig 40-60 cm deep and 50 cm in diameter. During the general sapling period, 1-2 holes were dug per plant, and the initial result tree was digging 2-4 points per plant. In the fruit period, the big trees dig 4-6 points per plant. Fill the bottom of the hole with 20 cm thick crude organic material (such as crop straw, fine twigs, etc.), then mix the fertilizer and topsoil at a ratio of 1:3 and fill it into the hole (100 grams of compound fertilizer per hole). ), fill with water after the sinking, after the water infiltration, the subsoil will be thrown into the ground surface, and the tree tray can be leveled. The direction of fertilization is staggered each year, and the amount of fertilizer is increasing year by year. In the autumn, organic fertilizers and compound fertilizers are used in the hole. Although the fertilization scope is small, the fertilizers are concentrated, which can effectively improve the soil in fertilization points, make fertilization points have fertile soil and good physical and chemical properties, and create a good nutrition environment for root growth.