1. Walnut is a warm-loving tree species, and the suitable temperature range and frost-free period are: annual average temperature 9 degrees-16 degrees, extreme minimum temperature minus 25 degrees-minus 2 degrees, extreme maximum temperature below 38 degrees, and frost-free period 150 days.

2. Walnuts like light. After entering the fruiting period, it is more necessary to have sufficient lighting conditions. The annual sunshine hours should be more than 2000 hours to ensure the normal growth and development of walnuts. If it is less than 65,438+0,000 hours, the core-shell and nucleolus will be stunted. In cultivation, light must be considered from the aspects of garden selection, planting density, cultivation method, shaping and pruning.

3. Soil is the foundation for the growth and development of all plants. The huge root system and tree body of walnut need deep soil layer (more than one meter) to ensure its good growth and development.

4. Walnut is resistant to dry air, but sensitive to soil moisture. Too dry or too wet soil is not conducive to the growth and fruiting of walnuts. Therefore, soil and water conservation engineering measures should be taken in mountain walnut orchard; On the flat land, the drainage problem should be solved. The groundwater level of walnut orchard should be 2 meters below the surface.

5. Walnut likes loose soil and good drainage, and it doesn't grow well in the soil with high groundwater level and heavy viscosity. But it grows best in weak alkaline soil containing calcium. The adaptive range of soil PH value is 6-8, and the soil salt content should be below 0.25%, which has little influence on the growth results. Too much salt will lead to death. Walnuts like fat.

Bengbu City, Anhui Province? climate

Bengbu belongs to the transitional zone between the humid monsoon climate zone in the north subtropical zone and the semi-humid monsoon climate zone in the south temperate zone, with four distinct seasons, mild climate, moderate rainfall and abundant sunshine. The annual average sunshine hours are 2 167.5 hours, the average temperature is 15. 1℃, the annual average precipitation is 905.4 mm, and the average frost-free period is 2 10.