Due to different soil and climatic conditions in different parts of the country, the tree growth results are also different. Therefore, the time and frequency of top dressing of fruit trees should be flexibly controlled according to the tree development, species characteristics, and soil conditions. Usually 3-4 times a year can be topdressing. Apply water promptly after each fertilization.
1, shallow ditch method.
According to the size of the crown, the amount of topdressing fertilizer, and the type of fertilizer, the shape, depth, number, and length of trenches are determined. The shape of the dressing trenches includes semi-annular grooves, annular grooves, straight grooves, and radial grooves; the depth is about 10 cm, and the width is about 20 cm. Spread the dressing evenly into the ditch. When the amount of fertilizer is large, it is necessary to mix well with the soil, and the fertilizer should be broken up, otherwise it will be prone to fertilizer damage, and then it will be covered with soil, rinsed and watered.
2, point cast method
According to the size of the canopy, dig 6-12 deep 10cm square points or round holes under the canopy, apply the fertilizer into the hole and flatten it and water it.
3, ring groove method
That is to say, a shallow ditch (depth 10cm) around the canopy is opened around the circumference of the crown, fertilizer is applied to the ditch, the filling is filled and the water is poured. The location of the annular groove is generally on the outer edge of the crown.
4, radiation channel method
From the trunk 50-60cm to the outside of the crown, dig 4-6 shallow 10cm deep strips, spread the fertilizer into the ditch, fill the soil and cover it with water.
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