Fertilization Management techniques for High-yielding Pear trees

About a month before the pear fruit ripens, the growth rate accelerates, which is called the fruit expansion period. At this time, topdressing can improve photosynthetic efficiency and promote nutrient accumulation, which is beneficial to fruit expansion and flower bud differentiation. This topdressing will not only increase the yield of the current year, but also lay the foundation for the results of the coming year. 525 the fertilization period of Shandong fruit network is generally in the middle and later stage of fruit development. This period is the main period for the increase of fruit weight. Taking Huanghua pear as an example, the suitable period for the application of expansion fertilizer is in mid-late July; for late-maturing varieties such as Yaqing pear, it should be applied again in mid-August; and for early-maturing varieties such as Xiziyuan pear, it should be applied in early July. 525 the increase of fruit volume of fertilizer species in Shandong Fruit Network mainly depends on the accumulation of photosynthesis in leaves, while the transport and transformation of organic nutrients accumulated by photosynthesis to fruits depends on mineral elements such as nitrogen, phosphorus, potassium and so on. Nitrogen deficiency hinders leaf photosynthesis; phosphorus deficiency affects fruit growth; potassium can promote sugar transport, increase fruit sugar content, improve fruit quality and disease resistance. Therefore, the types of expansion fertilizer are mainly nitrogen, phosphorus and potassium. 525 the amount of fertilizer applied to pear trees in Shandong fruit network is determined by many factors, not only according to the content of nutrient elements that can be absorbed and utilized by pear trees in the soil, but also according to the factors such as tree age, tree potential, fruit hanging, fertilizer application last year and so on. Good results can only be achieved by fertilizing according to the land and trees. According to the experience of fruit growers, 1.5 kg of ammonium bicarbonate, 1 kg of calcium superphosphate and 0.5 kg of potassium sulfate should be applied for 50 kg pear tree expansion fertilizer. 525 the method of fertilization in Shandong Fruit Network is generally applied by digging holes, and the pits of adult pear trees should be dug at the projection of the crown and 3 places from the trunk. It can dig 3 or 4 pits, which are 20 cm deep and 20 cm wide. The application of expansion fertilizer must pay great attention to soil moisture, and irrigation is needed in case of drought. In the middle and last ten days of July, it was applied immediately after rain, and the soil was covered quickly after application to prevent the volatilization of nitrogen fertilizer and reduce the fertilizer efficiency. 525 the application of biogas fertilizer in Shandong Fruit Network is generally carried out after pear harvest, which aims to strengthen the potential of pear trees and ensure the yield of pear trees in the coming year. Apply 20 kg biogas liquid per plant, add 50 g urea, and spread it on the root. Huanyang fertilizer should be strictly controlled and the amount of fertilizer should be controlled so as not to cause autumn shoots and autumn buds to grow.