There are several reasons.
1, temperature 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, 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.
3. Soil is the foundation for the growth and development of all plants. The huge roots and trees of walnut need deep soil layer (above 1 m) to ensure their good growth and development. 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 adaptability of walnut to soil PH value is 6-8, which affects its growth and fruit. Walnut likes fertilizer, which requires fertile soil and high organic matter content.
4. 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.
It can be seen that walnut has strong adaptability to the environment. Pingxiang is the west of Jiangxi, and the climate is suitable for walnut growth. As long as you can choose good varieties, scientifically solve the problems of soil, water supply and drainage, rationally fertilize, properly plant closely and improve your management skills, I believe you will achieve a good harvest.