Substrate moisture absorbing-holding characteristic measuring device and using method thereof

Abstract

The embodiment of the invention provides a substrate moisture absorbing-holding characteristic measuring device and a using method thereof. According to the method, a holding force pressure-stabilizing module is used for generating a stable negative pressure. A substrate moisture sensing module includes a substrate storage and drainage unit and a moisture sensor; the substrate storage and drainageunit is used for placing a test substrate; and the moisture sensor is used for measuring the water content of the test substrate and sending the water content to the processing module. A holding force adjusting module enables the suction forces of the test substrate and the holding force pressure-stabilizing module to be equal. The test substrate can reach a preset water flow by adjusting the negative pressure generated by a holding force balance unit; the holding force balance unit is used for enabling the test substrate to keep the preset water flow. The processing unit calculates a moisture absorbing-holding characteristic curve of the test substrate in an optimized manner. According to the invention, the measuring device has advantages of simple operation, low cost and the like; the loose structure of the substrate is not protected; and thus the basic technical staff or production front line staff can promote and apply the device conveniently.

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...

AI Technical Summary

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

Images