First, the need for fertilizer characteristics According to the survey of high-quality high-quality pear gardens for many years, for every 1000 kg of pears produced, 4 to 6 kg of nitrogen, 2 to 3 kg of phosphorus, and 4 to 6 kg of potassium are required. Pear trees of different ages have different fertilization patterns. The main nutrients required for pear saplings are nitrogen and phosphorus, especially phosphorus, which have a good effect on the growth and development of roots. A good root structure is good for the crown structure of pear trees. The premise of robust growth. The demand for nutrients in adult fruit trees is mainly nitrogen and potassium, especially since the harvesting of fruits takes away a lot of nutrients such as nitrogen, potassium and phosphorus. If not added in time, it will seriously affect the growth and yield of pear trees in the coming year. Second, fertilization technology The application rate of pear tree fertilizer should be determined flexibly according to soil fertility, tree age, variety, yield, and climatic factors. In orchards with low soil fertility, high age and high yield, the amount of fertilization should be higher; the fertilization amount of orchard with higher soil fertility, small age and low yield is appropriately reduced. The varieties are more resistant to fertilizer, suitable for climatic conditions, and moderately applied with a higher amount of water. Conversely, the amount of fertilizer applied should be appropriately reduced. If the application amount of organic fertilizer is large, the application amount of chemical fertilizer should be less. 1. Apply enough base fertilizer Fertilization amount: The base fertilizer is mainly organic fertilizer, supplemented by chemical fertilizer, and the dosage accounts for about 40% of the annual fertilization amount. The base fertilizer is better than the spring, and the early autumn is better than the late autumn and winter. This is because: 1 This is the peak of autumn root growth, which can make the wound root heal early and promote a large number of new absorption roots. 2 can promote the absorption of autumn roots and photosynthesis of autumn leaves, increase the storage nutrition level, improve the quality of flower buds and the fullness of shoot buds, thereby improving the cold resistance, and the effect is excellent. 3 organic fertilizer autumn application, after winter and spring decomposing, fertilizer efficiency in the most stressful period of spring nutrients, get the best play. If winter application or spring application, the fertilizer is too late to decompose, it is easy to cause the spring to be strong when it is needed, and the autumn shoots are prolonged. 2, reasonable topdressing Top dressing before flowering: It is applied before flowering in early spring, which can promote germination, make flowering tidy, reduce falling flowers and fruit, and promote strong growth of new shoots. The applied fertilizer is mainly nitrogen fertilizer, accounting for about 20% of annual fertilization amount. The application rate is higher or the base fertilizer applied in winter, and the pre-flowering fertilizer may not be applied or applied less. Post-flowering top dressing: more application after Xiehua, can effectively improve the fruit setting rate, improve tree nutrition, and promote the rapid growth of the fruit in the early stage. The dosage is about 10% of the annual application rate. Topdressing during fruit expansion: Applying after the fruit enters the rapid growth period again. At this time, topdressing is important for promoting the rapid growth of fruit and promoting flower bud differentiation, laying a good foundation for production in the coming year. The amount of fertilization accounts for about 20% to 30% of the annual application rate. Keylocking threaded inserts are used to quickly repair stripped, damaged or worn out threads. Threaded insert products are also used in original equipment where they strengthen threads in soft metal like magnesium or aluminum. Keylocking Insert,Key Locking Thread Inserts,Keylocking Thread Repair Insert,Recoil Key Locking Inserts Shenyang Liming Mechanical Component Factory , https://www.helisert.com
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