(5) Management after planting and management after planting has a great influence on the survival rate and growth of seedlings, and directly affects early harvest and high yield. Management after cultivation mainly starts from the following aspects. 1. Soil and Fertilizer Water Management New planting saplings mainly ensure that the soil is moist, and should be regularly watered after planting. The guava young tree fertilization is mainly based on the dilute application of nitrogen fertilizer, focusing on promoting the vegetative growth of young trees to accelerate the crown formation, planting 40-60 days after the application of water and fertilizer can be 2-3 times to human urine, pig manure water, bean cake water and fertilizer is better. 2. After sapling plastic seedlings are allowed to grow for a period of time after colonization, then the trunk is cut at a distance of 40-50 cm from the ground to promote the emergence of new shoots within the trunk shaping belt, and then 6-8 branches are uniformly distributed to maintain the main branches. When it grows to 80-100 cm, the bundle will lead the main branch to extend around 45 degrees on all sides, prompting the emergence of new shoots at the lower part and picking up the heart at about 30 cm. Its characteristic is that 6-8 main branches are reserved, and the main branch is subjected to radial inducement. Each year, after strong cutting, the new shoots are germinated and then the heart is plucked as required to form a crown, which can effectively dwarf the tree shape and facilitate operations. The shaping method needs to be strengthened in management, otherwise the perennial shear will cause the tree vigor to weaken earlier. 3. Other pest control, weeding and other work, guava is mainly against root nematodes and blight, so that the seedlings grow robustly. III. Guava Orchard Management (I) Soil Management 1. Maintain guava Orchard Humidity The plant consists of water and dry matter. The nutrients absorbed by the plant are dissolved and transported by water. The amount of moisture is related to the porosity of the soil. If the water content is too low, the nutrient absorption and transportation are hindered and the fertility is poor. Excessive water content affects soil aeration and root respiration activity. Therefore, water is closely related to the growth of fruit trees, results and quality. The guava orchard soil moisture should be suitable for dry and wet, not too dry or stagnant water, in order to maintain tree vigor. 2. Improved soil pH Because of the long-term planting of guava orchard soil, coupled with large amounts of air pollution, chemical fertilizers and pesticides, the physical and chemical properties of the soil have changed drastically, the soil structure has been destroyed, the soil particles are hard, ventilation and water permeability are poor. The soil properties are gradually turning acidic or even acidic, the growth of the root group is hindered, the plant development is affected, and the quality is also poor. Therefore, the improvement of soil acidity is a top priority. The method of improvement is as follows: 3. The period is divided into spring and autumn. It is more important in spring. That is, entering the spring each year, before the onset of the rainy season, select sunny implementation. China Agricultural Network Editor
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