Yuanbao, Dragon Ball, Kuixiang and Shuobao are selected from the local walnut seedling population.
(2) Site conditions.
The soil type is cinnamon soil with limestone as the main parent material, with medium soil quality or sandy loam, with soil thickness ≥ 1m, pH ≥ 7.9, soil organic matter content ≥0.8%, sufficient illumination, good drainage and underground water level below 2m.
(3) Cultivation management.
1. Seedling raising: Walnut with strong affinity is selected as rootstock for grafting propagation or other asexual propagation.
2. Colonization:
(1) Time: from early April in spring or after defoliation in autumn to before soil freezing.
(2) Density: ≤495 plants/hectare.
3, fertilizer and water management:
(1) Fertilization: organic fertilizer is the main fertilizer, and high-quality organic fertilizer ≥ 25,000 kg/ha is applied to the orchard every year.
(2) Irrigation: Irrigation 1 ~ 2 times every May-June depending on the soil moisture of walnut orchard.
4. Shaping and pruning: according to the site conditions and planting density, select the appropriate tree shape, cultivate the main lateral branches and fruiting branches, make full use of light energy and reasonably load.
5. Environmental and safety requirements: The use of pesticides and fertilizers must comply with the relevant provisions of the state and must not pollute the environment.
(4) harvesting and post-harvest treatment.
1. Harvest time: 20 %- 30% of walnut green fruits naturally crack or the green peel changes from green to Huang Shi.
2. Post-harvest treatment: after the walnut green fruit is harvested, it is peeled naturally or mechanically, dried in the shade or dried, and the water content is ≤8% while keeping the nut quality unchanged. 1, sensory characteristics: variety nut shape, fruit shape index, shell color, kernel selection difficulty, kernel color, kernel flavor, ingot shape, 0.8 1.03, light yellow, easy to take whole kernel, light yellow and white fragrance, unsmooth dragon ball round, 0.90 0.04, light yellow color, light yellow color. And it is not astringent and close to round 0.93 0.05 yellowish brown, and it is easy to take the whole kernel yellow-white or yellowish fragrance, and it is slightly astringent. 2. Physical and chemical indicators: single fruit weight (g), shell thickness (㎜), kernel yield, fat content, protein content, and ingot ≥13.000.9-/.0 ≥ 56%. 2% ≥70.0% ≥ 15.0% Kuixiang ≥12.01.0-1.2 ≥ 53% ≥ 66.0% ≥17.0% Shuobao ≥/.