With the fiery walnut market, walnut tree cultivation has become popular. The fertilization technology of walnut trees is one of the key technologies for the early harvest of walnut trees. In addition to applying enough base fertilizer to the walnut trees, the walnut trees should be fertilized at critical times every year. First, the basic principles of fertilization 1. Fertilization period. The application of fertilization before the peak of the three major peaks in the root system resulted in rapid root recovery, rapid absorption of nutrients, high utilization, and low losses. 2. Fertilization location. The location where the fibrous roots are distributed most is the depth of 40-80 cm, horizontally distributed in the vertical layer of the crown. If the soil is thin and does not reach this depth, it can be applied appropriately. 3. The amount of fertilizer. According to different varieties, soil fertility levels, tree vigor, growth and fertility period and the principles of balanced fertilization, put forward the amount of fertilizer. Generally calculated according to the projected area of ​​the tree crown, the projected area of ​​1 m2 of saplings is 0.2 kg of nitrogenous fertilizer, 0.05 kg of phosphate and potassium fertilizers, and 10 kg of farmyard manure; the projected area of ​​1 m2 of trees is 0.2 kg of nitrogen fertilizer and 0.1 kg of phosphate fertilizer and potassium fertilizer. Farmyard fertilizer 20 kg. 4. Rooted fertilization. According to the characteristics of walnut root growth: First, fattening. The roots are chasing long, and fertilization can induce root distribution. The second is compensatory. 2/3 of the root system can play a role of 95% of the root system. Therefore, appropriate centralized fertilizer application measures can be adopted to reduce labor and improve fertilizer efficiency. 5. Note. When fertilizing, no matter which method or fertilizer is used, it should be spread evenly, buried well with soil, and change its position every year or every time. When catching fast-acting fertilizer, it should be combined with irrigation so as to exert its fertilizer effect as soon as possible. Second, the three major peaks of root growth and fertilization 1. The first peak period. After sprouting to spring shoots vigorous growth period, to mid May. Top dressing is carried out before budding, with a depth of 40-60 cm and mainly available nitrogen fertilizer, accounting for 30% of the total amount of fertilization in the whole year, such as urea, ammonium nitrate, ammonium bicarbonate and so on. 2. The second peak period. Spring shoots stop to the walnut hard core period, generally from late June to early July. Top dressing, 40-60 cm deep, dominated by NPK fertilizer, accounting for 30% of the annual fertilization. 3. The third peak period. After mid-ninth walnut harvest. This period has the largest amount of growth, and it is mainly based on fully decomposed farmyard fertilizers. It can be used in combination with compound fertilizers. It is best to be applied as soon as possible after the walnut trees, accounting for 40% of the total annual fertilization. Third, fertilization method 1. Trench fertilization. It is mainly used for basal fertilizer. Divide a mutually parallel fertilization ditch between the rows of the walnut orchards on the two sides of the tree trunk, located from the trunk to the edge of the canopy 2/3. The length of the ditch is 2/3 of the diameter of the crown. Both width and ditch depth are 30-40 cm. 2. Circular fertilization. Commonly used in walnut saplings, applied to the trunk to the edge of the crown 2 / 3. 3. Point fertilizer. Used for top dressing. Take the trunk as the center, from the trunk to the edge of the crown to the edge of the crown, digging around the trunk into a number of well-distributed fertilization points fertilization. Fast Shipping Laser Distance Sensor Hi there, Fast Shipping Laser Distance Sensor,Serial Laser Distance Sensors,USB Laser Distance Sensors,RS232 Laser Distance Sensors Chengdu JRT Meter Technology Co., Ltd , https://www.rangingsensor.com
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