Spring is the time when fruit trees sprout and flower. At this time, fruit trees need a lot of nutrients, especially nitrogen and trace elements. Therefore, in the spring management of fruit trees, proper top dressing is of utmost importance. This edition is aimed at fertilizing knowledge in spring orchards and providing references for fruit farmers. Apple tree The principle of fertilization is based on the soil fertility conditions and yield levels, and the amount of NPK fertilizer is appropriately adjusted. An orchard with no basal fertilization in autumn is applied early and before budding. The drought-prone areas in early spring must be supplemented with water after fertilization to facilitate the absorption and utilization of nutrients. It is recommended to fertilize the following orchards with an output of 2500 kg per mu: nitrogen fertilizer 10 to 12.5 kg/mu, phosphate fertilizer 5 to 7.5 kg/mu, potassium fertilizer 12.5 to 15 kg/mu, per mu 2500 to 4000 kg orchard: nitrogen fertilizer 12.5 to 20 kg/mu, phosphate fertilizer 6 to 10 kg/mu, potash 15 to 22.5 kg/mu; per mu above 4,000 kg orchard: nitrogen fertilizer 15 to 22.5 kg/mu, phosphate fertilizer 7.5 to 12 kg/mu, potash fertilizer 17.5 to 25 kg/mu. An orchard with zinc, boron, and calcium deficiency in the soil. Apply 1–1.5 kg of zinc sulfate, 0.5–1.0 kg of borax, and 20 kg of calcium nitrate per mu before and after germination; spray 0.3% borax and fruit bagging at the flowering and young fruit stage. Spray 0.3% calcium fertilizer three times before spraying. peach Principles of fertilization Different varieties of spring must be different during the top-dressing period. Early-maturing varieties are earlier than the top-maturing varieties, and they must also strengthen autumn-based basal fertilizers. The number of top dressings in spring is less than that of late-maturing varieties. Fertilizer recommended early maturing varieties, fertile soil, small age, strong tree orchard applied organic fertilizer 1 ~ 2 square / mu; late-maturing varieties, thin soil, old age, weak tree orchards applied organic fertilizer 2 ~ 4 square / mu. An orchard with a yield level of 1500 kg/mu: nitrogen fertilizer 10-12 kg/mu, phosphate fertilizer 5-8 kg/mu, potassium fertilizer 12-15 kg/mu; yield orchard of 2000 kg/mu: nitrogen fertilizer 15-18 kg/mu, Phosphate fertilizer 7 to 10 kg/mu, potash 17 to 20 kg/mu; yield level 3000 kg/mu orchard: nitrogen fertilizer 18 to 20 kg/mu, phosphate fertilizer 10 to 12 kg/mu, potassium fertilizer 20 to 23 kg/mu. The early-maturing varieties can be top-dressed before the peach sprouting (early March) and before the fruit expands quickly. The first time the combination of nitrogen, phosphorus and potassium is applied, and the second is potassium-based fertilizer combined with nitrogen and phosphorus; the late-maturing varieties can be pre-emergence, During the physiological differentiation of flower buds (late May to late June), the fruit was top-dressed three times before rapid expansion. Pear tree The principle of fertilization is to increase the use of organic fertilizers, implement peat cultivation, grass mulching, and fertilize the soil; the orchards with serious soil acidification should be improved with lime and organic fertilizers. According to the soil fertility conditions of pear orchard and the growth condition of pears, the amount of nitrogen and phosphorus fertilizers should be reduced appropriately, and the application of potash fertilizers should be increased. The trace elements such as calcium, magnesium, iron, zinc and boron should be added through foliar spraying. Plasticizer is widely used in industrial production of polymer materials, also known as plasticizer. Any substance added to a polymer material that increases the plasticity of the polymer is called a plasticizer. Plasticizer can improve the performance of polymer materials, reduce production costs and increase production benefits. [1] is a kind of important additives, chemical products as additives commonly used in plastics, concrete, mortar, the material such as cement, gypsum, cosmetic and detergent, especially in PVC plastic products, in order to increase the plasticity of the plastic and improve the strength of the plastic, you need to add phthalic acid ester, sometimes its content can be up to 50% of the products. Weakened the effect of plasticizer mainly resin molecular valence bond between time, increase the mobility of the resin molecular bonds, reducing resin molecular crystalline, increase the plasticity resin molecules, enhanced the flexibility, easy to machining, can legally used for industrial purposes, widely exists in food packaging, cosmetics, medical equipment, water and environment. Such as plastic wrap, food packaging, toys and so on. Imported Premium Plasticizer,Good Permeability Plasticizer,Resistant Plasticizer,Food Container Plasticizer Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com
It is recommended to fertilize the following orchards with an output of 2,000 kg per mu: nitrogen fertilizer 10-12 kg/mu, phosphate fertilizer 6-8 kg/mu, potassium fertilizer 10-12 kg/mu, per mu 2000-4000 kg orchard: nitrogen fertilizer 12-20 kg/mu, phosphate fertilizer 6 to 12 kg/mu, potassium 12 to 20 kg/mu. Extra-root fertilizer: Pear, zinc, iron and other lack of pear orchard can be sprayed with 0.2% borax solution, 0.2% zinc sulfate + 0.3% urea mixture or 0.3% ferrous sulfate + 0.3% urea solution before germination to the grand flowering period , every other week.