Ecological conditions for the growth and development of walnut

There are great differences in adaptability to precipitation among different walnut species and varieties in   .

The annual precipitation in the distribution area of    walnut is 800mm to 1200mm, while the introduction of early-bearing walnut to the area with precipitation more than 62.00mm is prone to disease. Walnut is tolerant to dry air, but sensitive to soil moisture. Too dry or too wet soil is not conducive to the growth and fruiting of walnut.

The picture shows walnut

  , for example, in Xinjiang Kuqa, Hotan and other major walnut producing areas, the annual precipitation is only 37. 5%. 50.82. 8 mm, the average relative humidity from April to September is only 31%-40%. Although it is very dry, walnuts grow well because of better irrigation conditions. Long-term sunny and dry climate, sufficient light and large temperature difference between day and night are beneficial to promote flowering and fruiting and improve fruit quality. The early fruiting and high yield of walnut in Xinjiang is formed under such conditions for a long time. Soil drought hinders root absorption, affects metabolic function, and causes flower and fruit drop and even leaf withering. Young walnut trees, such as early dry in the early growing season, rainy in the later stage, easy to grow branches, resulting in overwintering. Excessive soil moisture, poor ventilation, root respiration is blocked, serious can rest the root system, affecting the growth and development of the tree. Therefore, the mountain walnut orchard needs to take soil and water conservation engineering measures, while on flat land, it is necessary to solve the drainage problem. The groundwater level of walnut orchard should be 2 meters below the surface. The study shows that the level of groundwater level affects the root distribution depth of walnut.

The study of    Hebei Agricultural University proved that climatic conditions have an important effect on the growth and development, flowering and fruiting of walnut. In particular, the average temperature, sunshine, rainfall in July and October of the previous year and the climate from March to April of the previous year played an important role in flower bud differentiation, flowering, pollination, fruit setting and fruit development of walnut, and had a significant effect on walnut yield. There was more rainfall and sunshine in July of the previous year, and the average temperature was higher in October. The walnut yield increased significantly in the next year, showing a positive correlation, which can be used to predict the yield.