According to the yield, the proportion of fertilization should be balanced. The ratio of apple to nitrogen, phosphorus and potassium is 1:0.5:1. In general, 0.8 kg of nitrogen, 0.4 kg of phosphorus, and 0.8 kg of potassium are required for every 100 kg of fruit produced. Autumn is the late growth period of fruit trees. Potassium fertilizer is the main factor, which promotes fruit enlargement and sugar accumulation and improves quality. Grasp the timing of fertilization. After the fruit is harvested in the fall, the root growth peak comes when the basal fertilizer is applied, preferably after the autumn shoots stop growing. The Beijing area is from September to October. This will not only ensure that fruit trees absorb fertility, but also prevent overshoot growth. Organic manure, chemical fertilizers and extra-root fertilization were applied in combination. Organic fertilizer is generally used as a base fertilizer, and cattle and sheep manure and chicken manure are all available. The total amount of fertilizer, the amount of cattle and sheep manure to "pound fruit Jinfei" is appropriate, chicken manure can be halved, according to the total fertilization in autumn, for the lack of spring fertilization, supplement the amount of fertilizer and fertilizer types. Mainly based on the tree vigor and the current production load conditions, pay attention to add some nitrogen fertilizer, potassium dihydrogen phosphate and other root fertilizers. Pay attention to the location and depth of fertilization. Under normal circumstances, ring, semi-annular groove applies to saplings. The ditch, acupuncture, radiation trench fertilization method and garden spreading method are mostly used for adult trees. The depth of fertilization is generally about 40 cm. With the expansion of the tree crown, the scope and depth of fertilization should also be increased accordingly. It is advisable to apply it to the main distribution layer of the root system. Lu Renqiang: Fruit tree cultivation expert and researcher at the Forest Fruit Institute of Shanghai Academy of Agriculture and Forestry Sciences. He has engaged in fruit tree production and scientific research for 46 years and has a deep understanding of the production and development of northern fruit trees. He has extensive production experience in the comprehensive technical management of apples, pears and peaches. Metal Disposable Fiber Optic Laryngoscope Disposable Laryngoscope Set,Neonatal Laryngoscope Blade Sizes,Fiber Optic Laryngoscope Blades,Laryngoscope Blades And Handles Jiangsu Yongle Medical Technology Co., Ltd. , https://www.jsylmedical.com
Appropriate top dressing of apple trees in autumn
The root system of apple trees is mainly distributed in the soil layer of 0-40 cm. There are two peaks in the growth of root system in the year, and the second growth peak is in autumn. The absorption characteristics of apple trees are: nitrogen is predominant in the early stage, and potassium is the main component in the middle and later stages. Absorption of phosphorus is relatively stable throughout the year. Therefore, fertilization should pay attention to the following points: