Black walnut is a tree with deep roots and is suitable for intercropping. Reasonable intercropping can improve early economic benefits, promote the growth of walnut trees, especially high growth, and improve wood quality.

Intercropping crops should be a short-stemmed crop, such as beans, which can not only increase fertilizer and improve soil, but also plant medicinal plants, such as Codonopsis pilosula and Gastrodia elata.

2. Water and fertilizer management

Black walnut seedlings like fertilization. In order to ensure the growth of trees, fertilizer is generally applied once a year in April, June and August, and about 0.2kg of urea or compound fertilizer is applied to each plant.

If possible, it is best to use organic fertilizer once after 10 months, with 25-30kg per plant. With the increase of trees, the amount of fertilization should be appropriately increased year by year. In case of drought, pay attention to woodland irrigation.

Step 3: plastic trimming

The black walnuts in the orchard should be cut lightly, put long and leave more branches. The height of trunk is controlled at about1m. Trees should be scattered in layers with obvious central branches, and the total tree height should not exceed 10m.

Pruning of fruit trees is mainly to make full and reasonable use of space, prevent fruit from moving out, pay attention to the cultivation and renewal of fruit branches, and adopt techniques such as supporting, pulling, topping, hanging, cutting and ring. Tree pruning mainly promotes the tree to stand upright, and the trunk height should be 5-6m.

4. Flower and fruit management

Artificial pollination and spraying 0.2% copper sulfate and triacontanol at flowering stage and young fruit stage can improve the fruit setting rate by about 30%.

5. Pest control

Mainly leaf-eating pests, stem borers and Phytophthora.

In winter, timely cut off pests and dead branches, focus on burning, do a good job in yard cleaning, and reduce the source of pests and diseases; Spraying 500-800 times omethoate solution when larvae hatch from early spring to early summer to control pests such as longicorn beetles, inchworms and scale insects;

Scrape the diseased skin with a knife at the end of autumn, and apply arsenic compound solution 0/00 times of/kloc-to prevent diseases such as dry rot and ulcer. Insect pest control can spray pesticides such as methamidophos and parathion according to the types of pests. For leaf-eating pests such as caterpillars and beetles, pesticides such as phoxim and diphosphate can be sprayed.

According to different pathogens, Bordeaux mixture, chlorothalonil and thiophanate methyl can be used for control.