Walnut garden should be adapted to local conditions, timely, appropriate, scientific fertilization, so that the use of scientific fertilizer to save fertilizer.

1, the amount of fertilizer. The fertilizing amount of saplings can be referenced to the following criteria: based on the medium soil strength, the vertical crown projection area is calculated per square meter, and in the 1 to 5 years before the result, the annual fertilization amount (active ingredient) is 45 g of nitrogen fertilizer and 10 g of phosphorus. Potassium fertilizer 10g; Within the first 5 years after entering the initial fruit stage, nitrogen fertilizer 45g, phosphate fertilizer 20g, potassium fertilizer 20g, and the application of farmyard fertilizer 5kg; the amount of fertilizer for adult trees can be determined according to the specific situation, with reference to the amount of fertilization of young walnut trees, pay attention Increase the use of phosphorus, potassium and farmyard fertilizers.

2, fertilization period. Base fertilizer is usually carried out in the spring and autumn seasons, and autumn is better. Topdressing is usually conducted 2 to 3 times a year, in April, June and July respectively. The first and second time were mainly nitrogen fertilizers, and the third time was nitrogen, phosphorus and potassium compound fertilizers.

3, fertilization method. Fertilization methods include whole garden application, radial application, culmination application, strip application, disk application, etc., and all localities should adopt local methods and choose effective methods.

(1) The whole garden is applied. Walnuts grown on regular farmland generally use this method. After harvesting of the intercropping crops, a layer of farmyard fertilizer is spread under the tillage soil before plowing the land.

(2) Radial application. With the crown as the center, in the canopy projection range, 4-8 fertilization trenches are excavated in a radial pattern, with a width of 20-40 cm and a depth of 30 cm (basic fertilizer is slightly deeper, and the top dressing is shallower). The length of the ditch is similar to the radius of the canopy. Deep gradually deepened from inside to outside of the crown. After the fertilization ditch is dug, the fertilizer and soil are fully mixed and filled into the ditch, and then the soil is covered. The location of the fertilization ditch should be changed every year, and gradually moved outwards as the crown continues to expand. This method is mainly used for walnut trees with weak growth potential and older trees.

(3) circular fertilization. Take the trunk as the center and dig a ring with a depth of 30cm and a width of 20-40cm along the outer edge of the canopy, fill the soil with fertilizer and soil, and then cover the soil. The base fertilizer is buried deeper and the top dressing is buried shallower. The fertilization ditch can be dug half ring, can also be digging the entire ring, digging a half ring needs to be excavated alternately, one position per year. This method is more suitable for 4 years of young walnut trees.

(4) point fertilizer. Within the canopy projection range, excavate a number of holes (number and size depending on the size of the crown) and bury the fertilizer. This method is generally used for top dressing.

(5) Strip fertilization. Between walnut trees or between trees, separate fertilization trenches are dug along the opposite sides of the crown edge. The length of the trenches is determined by the size of the crown. The digging site is changed every year.

(6) Disc-shaped fertilization. With the trunk as the center, the tree disk is made into a shallow, deep disk that can hold water. When digging, we must pay attention to protecting the root system and gradually deepen from the inside out. This method is often used for saplings to excrete manure for absorption. It can also be used for composting organic fertilizers and miscellaneous fertilizers. It is a combination of deep and shallow application.

(7) Foliar spraying. The types and concentrations of fertilizers commonly used for foliar fertilization are: urea 0.3% to 0.5%, superphosphate 0.1% to 0.5%, potassium sulfate 0.2% to 0.3% (leaf ash extract 1%), potassium dihydrogen phosphate 0.3 % to 0.5%, boric acid 0.1% to 0.2%, ammonium molybdate 0.1% to 0.5%, copper sulfate 0.3% to 0.5%. Fertigation time can be carried out at the flowering stage, rapid growth stage, flower bud differentiation stage, and harvesting, respectively. It should be sprayed before 10 o'clock in the morning and after 3 o'clock in the afternoon. It should not be sprayed in rainy or windy weather.

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