The quality of walnut production and the quality of its quality are directly dependent on its site water supply. Insufficient soil moisture supply in walnut producing 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 these reasons: the flowering period is cold and rainy, which leads to poor pollination. Pecans consume a lot of nutrients during flowering, and the tree has a nutrient loss. The forest has insufficient fertility or lacks trace elements such as copper and boron. A small number of forests, vegetative growth is too prosperous, leading to physiological fruit drop. However, the soil moisture content will also have a certain impact on it. During the growth process, the soil moisture can be controlled by the soil moisture thermometer. For example, the amount and time of controlled irrigation can be accurately determined by means of the soil water potential meter. Understand that using this instrument to operate, to avoid different soil properties of different judgment schemes.
The soil moisture content was controlled by multi-parameter soil measuring instrument. The soil moisture content of the first stage (April 1st - June 20th) was 95, 115, 135 and 155 g.kg-1. (The order is 38.5%, 46.6%, 54.7% and 62.8% of the maximum water holding capacity in the potted soil field in turn); the soil water content in the second (June 21st - October 31st) water control treatment is 75, 95, respectively. 115 and 135 g·kg -1 (in turn, the maximum water holding capacity of potted soil fields was 30.4%, 38.5%, 46.6% and 54.7%).
The first irrigation had a significant effect on the fruit drop rate in May, and the fruit drop rate decreased significantly with the increase of irrigation amount. In the three-level water treatment, the 225 kg irrigation rate was the lowest (24.6%), which was 6.1% less than the control; the 75 kg irrigation rate was the highest (28.2%), which was 2.5% less than the control; the film, heavy shear and grass falling The rates were 17.4%, 23.3%, and 25.6%, respectively, which were 13.3%, 7.4%, and 5.1% lower than the control. The reason for reducing the rate of fruit drop is that each treatment not only improves the water condition of the soil and the tree, but also improves the nutrient status and lighting conditions of the tree.
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