Effect of Field Irrigation on Water Absorption of Plant Roots
The study of water absorption in crop roots has always been an important topic for scientists. In the process of this research, we need to use a soil moisture meter for measuring soil moisture content, and a root analyzer for comprehensive system analysis of crop roots.
In recent years, with the deepening of the research on root-crown communication theory and stomatal regulation theory, a new water-saving irrigation technology-Partial root-zone irrigation (PRI) has been proposed and successfully applied to crops and peaches and pears. , grape, apple and other fruit tree production, water use efficiency, compensation effect and root signal transmission and other research. Although much research has been conducted on the application of PRI technology in crops and some fruit trees, it is mainly focused on water use efficiency, yield, and quality. However, there have been few reports on the effects of PRI technology on root growth and root vigor of fruit trees. .
Torrecillas et al. believe that the root system is the link between the plant's absorption of water and nutrients and the perception of the soil environment. Root growth and vitality levels play a crucial role in the development of fruit trees and the formation of yield. Within a certain range of moisture, root growth is positively correlated with soil moisture status. When water stress, root activity declines, which in turn affects root distribution, aboveground growth and yield.
Therefore, it is of great significance to clarify the growth dynamics of plant roots under different soil moisture conditions in order to formulate reasonable irrigation management measures. PRI irrigation is a local irrigation technique. The basic method and idea is to only apply water to the roots of the plants at a time, and exchange the irrigation sites when the rest of the roots reach a certain level of drought stress. The water absorption in the roots of the wet area maintains the normal physiological activities of the plant. The root system in the dry area senses and transmits information on the soil drought, thus allowing the above ground to respond to drought stress, and ultimately achieve water saving and high yields. This technology has the characteristics of small soil moisture area, frequent irrigation and rapid movement of soil moisture, and its special irrigation method and water distribution form have a great influence on the growth and distribution of the root system. However, due to the short period of application of the PRI irrigation technology at home and abroad, and the limitation of the root system to unobservable soils under field conditions, the breadth and depth of the root research is far less than the above ground.
At present, the effects of different irrigation methods on the growth and distribution of roots are mainly concentrated on corn, wheat, cucumber and other crops. However, there are few studies on the effects of PRI irrigation techniques on the growth and distribution of roots in apples. Therefore, the potted method was used to investigate the effects of conventional irrigation, persistent deficit irrigation, and root-zone irrigation on the growth of apple roots in order to provide theoretical basis for the development of orchard irrigation management measures in arid and semi-arid areas and to increase the water use efficiency of fruit trees. in accordance with.
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