Guava Orchard Management 2. The use of materials including quicklime and natural active agent renin. The above two kinds of optional spreads, together with cultivators, promote full integration with the soil. However, the former should be careful not to apply it every year to prevent excessive penetration of the lime plasmid into the bottom of the soil and cause secondary damage. PH is adjusted to 5.5-6.5. 3. Full use of organic guava gardens To promote good soil structure, strong root mass distribution, and improved quality, the application of organic fertilizers is indeed necessary. The addition of organic fertilizer can also adjust the acidity and alkalinity of the soil, increase the formation of fruit wax, and reduce the pest damage rate. Organic fertilizers, also known as slow-acting fertilizers, have a long-lasting fertilizer effect. The use period is twice a year, the first time in March-April, and the second time in August-September, depending on the actual situation. The application methods include spreading, ditching, and applying. The amount of application depends on the age and type of tree, and the number of trees born in three or four years is about 15-30 kg per year. There are many kinds of fertilizers. At present, apart from livestock excrement, there are organic fertilizers, decomposed compost, and bean cakes. If the livestock excrement is selected, it must be fully fermented, otherwise, it is easy to produce fat and breed pests. 4. Cultivated soil The aim of cultivating soil in the guava garden soil is to promote a good state of the soil structure, fully mix organic matter and inorganic matter, replace weak roots with new roots, promote strong root groups, and maintain microbial activity in the soil. To promote plant growth, yield stability, and quality improvement are the ultimate goals. The age of two years or more is implemented 1-2 times a year. The period is in spring and autumn, especially in spring. When cultivating, with soil amendments and organic matter applied after application, can be applied phyto organic fertilizer, decomposed animal fertilizer, phosphate rock, superphosphate, calcium magnesium fertilizer or part of the phosphorus and potassium fertilizer, and fully mixed with the soil. Should choose to operate on a continuous sunny day. The range of cultivator should not be close to the main trunk, and should be 1/2 of the radius of the crown. After cultivating, sunlight should be used to promote the weathering of the soil particles. After the initial cut of the root group wounds healed, when the new root grows, it can be watered for about 10-14 days, otherwise the roots are easily damaged by fat and cause the growth potential to be blocked. The depth of cultivator is about 15-18 cm deep in the spring, and it should not be more than 6 cm deep in the fall because of the fruit. At this time, the cultivator can have the weeding function. 5. Orchard grass cultivation Guangdong guava gardens are mostly used Qingpi method, can make the orchard clean and beautiful, operation and management methods, water, nutrients can not be easily absorbed by the weeds to compete. However, it can also lead to deterioration of soil physical and chemical properties, erosion of surface soil, evaporation of water and nutrients, increase of labor costs, uncontrollable temperature, weak plant growth, and reduced yield and quality. Grass cultivation can make plants grow strong, yield is high, skin is beautiful, soil is loose, moisture is kept moist, ground temperature is stable, and quality is improved. Soluble solids in the same garden increase by 1%-2%. (B) Fertilization Management 1. Fertilizer Application Notes Chemical fertilizers are cheap, high purity, and easy to use, while organic fertilizers have high prices and are time-consuming and labor-consuming, but organic fertilizers are bulky, slow to decompose, and can increase soil aeration, Increase water retention and improve soil physical structure, improve fertilizer availability and root activity, in order to maintain soil productivity, should try to maintain or increase soil organic matter content. However, the application of chemical fertilizers is quick and effective. In actual cultivation, the use of organic matter is completely used. This possibility is not significant. We can reasonably use chemical fertilizers in the context of economic benefits, and use them in combination with organic fertilizers to improve the quality of guava. Increase the income of farmers. The application of fertilizers should be dominated by slow-acting organic fertilizers supplemented by chemical fertilizers. There is a wide range of organic fertilizers, including plant matter, animal matter and animal waste. Organic fertilizer composition is extremely important, commonly used are rice bran, ricinus, rapeseed meal, soybean meal, peanut meal, discarded rice husk, bagasse, waste mushroom seeds, peat, animal hair and bone meal, bird droppings, cow dung, Chicken manure, pig manure, fish essence, seaweed extract, lotus root starch, etc. The use of commercially-available bags of fully-ripened organic fertilizers requires that some of the compost be contaminated with other substances such as urea, ammonium sulfate, phosphate rock or silicic acid slag, and even have a high concentration of chemical components that causes damage. For those with low organic matter content in the viscous soil, it is recommended to use organic matter with a high content of fiber because of its high carbon-nitrogen ratio and slow decomposition rate. Long-term application can increase soil organic matter content year by year to improve soil physiochemical properties. The manure-based organic manure is relatively high in content of nitrogen and phosphorus, and contains high levels of heavy metals such as copper and zinc, which is not suitable for long-term use. Different kinds of organic fertilizers have different fertilizer effects. The use of only one type of organic fertilizer requires that the proportion of three elements contained in the organic fertilizers does not necessarily suit the needs of different guava fruit during different growth periods. The specific soil fertility conditions are different. If a large amount of organic matter is applied over a long period of time, the It may cause imbalance in nutrients in the soil, affect crop yield and quality, so it should be used in conjunction with chemical fertilizers to make it suitable for different fertility periods. China Agricultural Network Editor