There are two kinds of land selection, namely, the selection of nursery land and the selection of planting land. Nursery land is usually planted in sandy soil or loam with relatively loose soil and flat terrain and good drainage and irrigation, close to the water source area. Only the soil with sufficient water, fertile soil, rich organic matter and low soil viscosity can be planted in the planting area. When preparing the soil, the soil quality in Miao Di should be refined and leveled, and the whole cultivation or hole cultivation can be used, but the base fertilizer must be laid well. The base fertilizer is mainly organic fertilizer or agricultural machinery fertilizer, and then other trace fertilizers can be supplemented according to the characteristics of the soil.

2. Seeding and seedling raising of pine nuts.

Before planting pine nuts, we need to store the seeds in river sand to accelerate germination, preferably indoors, and we should also close the doors and windows indoors and disinfect them to avoid affecting the germination rate of pine nuts. Under normal circumstances, it is necessary to accelerate the germination of seeds in winter this year, and sow in spring the next year. When sowing, the seedbed should be disinfected, and then the seeds should be evenly sown by drilling, covered with a layer of plastic film or straw for heat preservation, and anything used for seedling raising elements should be disinfected.

3. Seedling management of planting pine nuts.

After sowing, we should pay attention to the water management in the seedbed and water it properly. Generally, we should sleep for about one month after sowing. During this period, we should prevent rats or birds from harming the seedlings. We can sprinkle some bait with medicinal liquid in the field and spray it with carbendazim or ferrous sulfate every seven to ten days, which can enhance the immunity of the seedlings and prevent diseases. Then it is necessary to loosen the soil and weed for many times during the growth of the seedlings, which can promote the growth of the seedlings. Finally, when the seedlings grow to about ten centimeters, they can be transplanted.

4. Reasonable close planting of pine nuts.

Pine nut trees have to be transplanted many times before they can grow into big trees, so the density of each transplant must be different. When we transplant for the first time, we only need to plant the basic rows at a distance of 30 to 40 centimeters per row and about 30 centimeters per plant, while when we transplant for the second time, we usually plant them at a distance of 60 centimeters per row and 50 centimeters per plant, and when we transplant for the third time, we usually transplant them at a distance of 1.5 meters per row and 1 meter per plant, and increase the spacing appropriately each time, and keep the spacing in the last row.

5. Field management of planting pine nuts.

Because the purple potato has to be transplanted, its field management is more complicated. Every time it is transplanted, soil preparation and fertilization are needed, and topdressing and watering are carried out according to its growth, as well as the most basic intertillage weeding and ridging. At the same time, branches and leaves are trimmed and shaped to ensure the growth and tree shape of pine nuts.