Method for automatically controlling constant soil water flow

Abstract

The invention discloses an automatic control method of constant soil water potential, mainly realizing the constant soil water potential control by establishing water dynamic equilibrium between the soil and constant water potential solution to realize real time compensating water loss of the soil. The method comprises the following steps that: a water solution is provided with the water potentialthereof constant; the constant water potential solution is connected with the soil through a selective permeation medium one, a closed water body, a selective permeation medium two in sequence, thusestablishing a water dynamic equilibrium system. The solution exchanges water with the closed water body through the selective permeation medium one, and water can permeate the selective permeation medium one freely but not the solute in the solution, i.e. reverse osmosis membrane; the closed water body exchanges water with the soil through the selective permeation medium two, and water can pass the selective permeation medium two freely but not the soil and air, i.e. a micro porous ceramic container. The invention can effectively control constant soil water potential, and is widely applicableto the agriculture and scientific research field.

Description

technical field [0001] The invention relates to a method for automatically controlling the constant soil water potential. It belongs to the field of agricultural science and technology. Background technique [0002] The world's population is increasing day by day, and the earth can provide us with limited resources, coupled with global warming and frequent droughts, it has brought problems to agricultural production in many countries around the world. Agricultural research workers are facing a new challenge: how to use limited agricultural resources to continue to develop agricultural production and meet the needs of social production and people's lives. Among the contradictions between agricultural production and agricultural resources, the contradiction between agricultural production and water resources is quite prominent. In modern society, the development level of agricultural production largely depends on the water supply and supply time in agricultural production. ...

AI Technical Summary

Problems solved by technology

This method is generally used under field conditions, and it is reasonable, but it also has disadvantages: ①Under field conditions, the soil water potential varies in a large range, and it is not possible to determine well under which soil water potential conditions, the test index will occur. ②It is difficult to control the soil water potential. Using this method to study the soil water potential will inevitably require a lot of work. It will take more time to observe when the soil water potential is adjusted by irrigation water. If the soil water conductivity is poor , the soil water potential tensiometer changes slowly; it will take more time; ③The control of soil water potential requires other facilities to be invested. In order to prevent the influence of water flow between test areas, it is necessary to prevent the flow of groundwater or the entry of external water test area

④ This test method cannot automatically and constantly control the soil water potential

[0005] At present, there are few research reports on the constant control method of soil water potential.

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