Environmental conditions for planting and growth of walnut

. 1. Walnut growth characteristics

Juglans regia L. is a kind of positive tree species, suitable for growing in leeward and sunny soil, neutral to slightly acidic soil. It is cultivated in Yunnan Province from 21°08′32 " ~29° 15′08 " N, 97°31′39 "~106°11′47 " E and 700~3200m above sea level. The annual average temperature of the distribution area is 6.1~20.6℃, among which 12.4~15℃ is suitable. When the annual temperature is lower than 12℃, the shell of walnut becomes thinner and even the kernel appears. When the temperature drops to-10℃ in winter, the young walnut branches will be frozen.

2. Walnut condition analysis

Walnut cultivation time is longer, the eastern mountain growth of hundreds of years of old walnut trees. At present, there are 200,000 mu of walnut in the whole county. The main varieties are 5 new varieties of early-bearing hybrid walnut (Yunxin 301, Yunxin 303, Yunxin 306, Yunxin Plateau, Yunxin Yunlin), Yangbi big bubble walnut, Dayao Santai walnut and other excellent varieties. Walnut development has suffered a variety of natural disasters, but most of the preserved fruit has been hanging.

walnut

North subtropical plateau monsoon climate type, dry winter and wet summer. The climate is characterized by mild all year round, no cold in winter, no heat in summer, warm and dry in spring, cool and humid in autumn, concentrated precipitation and distinct dryness and wetness. The annual average temperature is 14.8℃, the coldest month in January is 7.5℃, the hottest month in June is 41%, and the precipitation at this time is only 16% of the whole year, the relative humidity is only 62%, and the lowest is only 50% in March. The sunshine time is more in dry season than in rainy season, and the maximum in spring is 729.5 hours, accounting for 32.5% of the whole year.