All know the impact of the external environment on the crop, light, water, oxygen, temperature and so on, the production of walnut seedlings can not be separated from the appropriate temperature, of course, the temperature is not absolute, as long as the guarantee in the appropriate range can be.
Walnut is hi temperature of the tree species, in general, walnut seedlings in the case of an average annual temperature of 8-15 ℃ more suitable for production, and the absolute minimum temperature of not less than -30 ℃, the absolute maximum temperature below 38 ℃, more than 150 days Of the frost-free areas. Young trees at -20 ℃ under the conditions of "pumping" or frozen to death phenomenon; by the adult tree -30 ℃ low temperature, but the temperature is lower than -28--26 ℃ when the branches, male flowers and leaf buds susceptible to freezing The
Walnut seedlings after the leaves, in case of -2-4 ℃ low temperature, the new shoots will be frost damage; flowering and young fruit temperature dropped to -1-2 ℃ when the reduction. But if the temperature exceeds 38-40 ℃, the fruit is easy to burn, leading to the nucleolus can not develop.
For crops, the external environment plays a very important role in their growth, so before planting walnut seedlings, to the local temperature and so do a detailed understanding, to choose the right place to plant.