Hefei climate:
Hefei is located in the mid-latitude zone and belongs to the subtropical monsoon humid climate, with obvious monsoon, distinct four seasons, mild climate and moderate rainfall. The annual average temperature is 15.7℃, the annual average precipitation is about 1000 mm, the annual sunshine time is about 2000 hours, the annual average frost-free period is 228 days, and the average relative humidity is 77%.
Growing habits:
Temperature: Walnut is a warm-loving tree species, and the suitable temperature range and frost-free period are: annual average temperature of 9 degrees-16 degrees, extreme minimum temperature of minus 25 degrees-minus 2 degrees, extreme maximum temperature of below 38 degrees, and frost-free period of below 150 days.
Light: 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.
Soil: 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.
Moisture: 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.
Walnut likes loose soil and good drainage, and it doesn't grow well in the soil with high groundwater level and high 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.
Walnut belongs to Juglandaceae, a deciduous tree with pinnate leaves. Endocarp is hard, wrinkled and yellowish brown. The fruit is harvested around a thousand years ago, the outer skin of the fruit rots, and the inner fruit is rinsed, dried and cleaned, which is what people call "walnut". In fact, this is just a statement. According to archaeological findings, walnuts appeared as early as the Neolithic Age or earlier, which proves that China is one of the cradles of walnuts.