The level of walnut production and the quality of the walnuts directly depend on their site water supply. The lack of supply of soil moisture in walnut production areas has seriously affected the yield, quality and tree growth of walnuts, and has become an important factor restricting the development of industrialization. The phenomenon of walnut fruit drop is mainly caused by several reasons: The flowering season is low and rainy, resulting in poor pollination. Pecans consume a lot of nutrients during flowering and the tree loses nutrients. Forests lack of fertility or lack of copper, boron and other trace elements. A small number of forests have grown too nutriently to cause physiological fruiting. However, the level of soil water content will also have a certain impact on it. During the growth process, soil moisture can be controlled by a soil moisture temperature measuring instrument. For example, the amount and time of controlled irrigation can be used to measure the soil water potential. Accurate understanding, using the instrument to operate, to avoid the different soil properties of different judgments. Metal Casting Parts,Functional Hydraulics Parts,High-Tech 3D Printing Provider,Metal Machining Parts Guangdong Fenghua Zhuoli Technology Co., Ltd , https://www.fhzl-3dprint.com
Using the soil moisture monitoring system to control the soil moisture content, the first four soil water levels in the first phase (April 1-June 20) were 95, 115, 135, and 155 g.kg-1 (control). For the potted soil, the maximum water holding capacity in the field was 38.5%, 46.6%, 54.7%, and 62.8%); the water content of the second-phase (June 21-October 31st) water treatment was 75, 95, and 115 respectively. 135 g·kg-1 (in turn, the maximum water holding capacity in potted soil was 30.4%, 38.5%, 46.6%, and 54.7%).
The first irrigation had a significant effect on the fruit drop rate of walnuts in May, and the fruit drop rate decreased significantly with the increase of irrigation volume. In the three-level water control treatment, the 225kg irrigation water drop rate was the lowest (24.6%), 6.1% less than the control; the 75kg irrigation water drop rate was the highest (28.2%), 2.5% less than the control; the film coating, heavy cutting, and grass cover fruiting rate were respectively It was 17.4%, 23.3%, and 25.6%, 13.3%, 7.4%, and 5.1% lower than the control, respectively. The reason for reducing the fruit drop rate is that each treatment measure not only improves the water status of the soil and tree body, but also improves the nutrient status and light conditions of the tree body.