Device for automatically controlling constant soil water potential

Abstract

The invention discloses an automatic control device of constant soil water potential. The device mainly utilizes a semi permeable material and solution with constant water potential to control a certain range of the soil water potential to be constant at a specific value. The device comprises a constant hydraulic pressure water supply device, an automatic water inlet control device, a semi permeable water control device and a micro porous container; the constant hydraulic pressure water supply device can supply water out at a constant hydraulic pressure, and the automatic water inlet control device can automatically control carrying capacity transported to the constant water potential solution, thus ensuring the water potential is constant; the semi permeable water control device employs the semi permeable material as main functional parts, which can realize water exchange between the solution with constant water potential and the closed water body; a plurality of holes with micro hole diameter are distributed at the surface of the micro porous container, water can pass through the holes but with comparatively low air inlet value, thus realizing the water exchange between the closed water body and the soil. The invention can effectively control constant soil water potential, and is widely applicable to the agriculture and scientific research field.

Description

technical field [0001] The invention relates to a device for automatically controlling 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. Agro...

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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 almost no research reports on the constant control device of soil water potential.

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