1, soil fertilization
(1) Radial fertilization. This method is commonly used for saplings over 5 years old. Starting from different positions on the edge of the canopy, dig 4-8 radial fertilization channels in the direction of the trunk. The length of the ditch is generally 50 cm, the width is 40-50 cm, the width of the ditch is 30-40 cm deep, and the depth of the ditch is 10-20 cm. The position of fertilizing ditch depth should be changed every year, and it should move outward with the expansion of the crown.
(2) circular fertilization. It is commonly used in sapling trees up to 4 years old. Around the trunk, along the outer edge of the trunk, an annular fertilization ditch 30-40 cm deep and 40-50 cm wide is dug. The fertilizer is evenly applied and buried, and the base fertilizer can be buried deeply. Some, chase fertilizer can be shallow buried. The location of the fertilization ditch expands outward each year as the canopy expands.
(3) point fertilizer. This method is mostly used for top dressing. Take the trunk as the center, starting from 1/2 of the radius of the crown, dig into several small holes with even distribution, and put the fertilizer into the hole to bury it.
(4) Strip groove fertilization. It is a method of fertilizing a row of ditch-like grooves in rows or between plants in a walnut garden. For example, on the opposite sides of the edge of the crown shadow, separate parallel fertilization ditches are to be dug. The ditch is dig 40-50 cm deep and 40 cm deep from the outside of the canopy.
2, outside the top dressing
Root dressing is simple and easy, with less fertilizer, and has a rapid effect. It can meet the needs of walnut trees and can avoid the chemical and biological fixation of certain chemical elements in soil. It is an effective method of assisted fertilization. At present, foliar fertilization is mainly based on the biological characteristics of walnuts. Fertilizer types such as Penshibao, Yunda-120, urea, multi-complexed micro-fertilizer Shikanglu and so on. Fertilizer concentration should not be too high.
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