A device for measuring matrix moisture absorption characteristic curve and its application method

Abstract

An embodiment of the present invention provides a substrate moisture absorption characteristic curve measuring device and its use method, the method comprising: a suction force stabilizing module for generating stable negative pressure; a substrate moisture sensing module including a substrate storage unit and a moisture sensor , the matrix storage unit is used to place the test matrix, the moisture sensor is used to measure the water content of the test matrix, and send the water content to the processing module, the suction force adjustment module makes the suction of the test matrix and the suction force stabilization module the same, By adjusting the size of the negative pressure generated by the holding force balance unit, the test matrix reaches the preset water potential, and the holding force balance unit is used to keep the test matrix to maintain the preset water potential; the processing unit optimizes and calculates the water absorption of the test matrix hold the characteristic curve. The invention has the advantages of not destroying the loose structure of the substrate, simple operation, low cost, etc., and is convenient for popularization and use by grass-roots technicians or front-line production personnel.

Description

technical field [0001] The invention relates to the technical field of soilless cultivation, in particular to a device for measuring a matrix moisture absorption characteristic curve and a method for using the same. Background technique [0002] Soilless cultivation technology uses artificial cultivation substrate instead of nutrient solution, which changes the dependence of traditional agriculture on soil. On the one hand, it fundamentally eliminates the occurrence of soil-borne diseases and insect pests. On the other hand, soilless cultivation can use land that is not suitable for agricultural production, such as the open space of building balconies and underground space, for crop cultivation, expanding the space for agricultural production. Soilless cultivation can precisely control the composition of nutrient solution, realize the sufficient supply of crop nutrients, and create favorable conditions for efficient cultivation of crop production. At present, soilless culti...

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Problems solved by technology

[0010] However, most soilless cultivation substrates are artificially prepared, and the structure is relatively loose or rich in organic matter. The commonly used centrifuge method, hanging water column method or pressure film method for measuring soil adsorption curves are not suitable for the water holding characteristics of soilless cultivation substrates. The reason for the determination of the curve is as follows: the adsorption characteristics of the matrix are measured by the centrifuge method, the suspended water column method or the pressure film method, but the equipment used is relatively expensive and the operation is cumbersome, and it is mostly used for scientific research

In addition, the centrifugal force generated during the high-speed rotation of the centrifuge rotor during the measurement of the holding curve by a centrifuge is likely to cause matrix compaction, thereby changing the structure of the matrix and bringing certain errors to the measurement results; although the hanging water column method or the pressure mask method It will not destroy the structural stability of the matrix, but the measurement period is longer, and it is easy to breed fungi and algae during the measurement process, which will also change the porosity of the matrix and bring certain errors to the measurement results

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