Automatic temperature compensation type soil water tension meter system and determination method

An automatic compensation and soil moisture technology, applied in soil material testing, material inspection products, etc., can solve problems such as low irrigation efficiency, misoperation of water management, and untimely irrigation, and achieve the effect of large data collection and error reduction.

Inactive Publication Date: 2014-06-25
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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Problems solved by technology

[0002] In the 21st century, the main constraints to the sustainable development of agriculture in my country are insufficient water resources and uneven distribution of water and soil resources. For the large agricultural water users who use 73.1% of the water, in the case of insufficient water resources, due to the relatively backward irrigation technology in my country , there are serious phenomena such as untimely irrigation and excessive irrigation, which affect the

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  • Automatic temperature compensation type soil water tension meter system and determination method
  • Automatic temperature compensation type soil water tension meter system and determination method
  • Automatic temperature compensation type soil water tension meter system and determination method

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Experimental program
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Effect test

Embodiment 1

[0052] Refer to the temperature rise curve of the "425-459" time node data segment ( Figure 6 ) for the calculation of temperature compensation

[0053] The temperature at reference point 425 is 3.7°C and the tension is 21.4Kpa

[0054] The temperature at reference point 445 is 21.8°C and the tension is 14.9Kpa

[0055] The specific sampling time points of the two points are: the sampling time of point 425 is 7:33:17 in the morning of 2014.1.6

[0056] The sampling time of 445 points is 2014.1.6 at 11:06:28 am

[0057] by Figure 6 Calculation of temperature compensation for the temperature rise curve of the "425-459" time node data segment

[0058] Y 3.7 is the calculated value of tension (Kpa) at 3.7°C, Y 21.8 Calculated value of tension (Kpa) at 21.8°C

[0059] Y 3.7 =0.0121×X 2 -0.6523X+23.552

[0060] =0.0121×3.7 2 -0.6523×3.7+23.552

[0061] =21.304 (Kpa)

[0062] Y 21.8 =0.0121×X 2 -0.6523X+23.552

[0063] =0.0121×21.8 2 -0....

Embodiment 2

[0070] Refer to the temperature rise curve of the "425-445" time node data segment ( Figure 6 ) to calculate the temperature compensation:

[0071] Compensation formula: Y=0.0121×X 2 -0.6523X+23.552

[0072]

[0073]

[0074] "Temperature" and "measured tension value" in the table are the actual measurement values ​​of the temperature compensation tensiometer in the agricultural greenhouse, and "calculated value" is the corresponding tension value of each temperature point calculated by the compensation formula. The tension difference is the difference between the calculated value at the initial temperature (3.7°C) and the calculated values ​​at other temperature points.

[0075] From Figure 7 It can be seen that the trend of temperature-compensated tension (i.e., soil water suction) tends to be horizontal within 4 hours, which is consistent with the actual situation in the field. (Soil water content tends to be constant in a short period of time when no external w...

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Abstract

The invention relates to an automatic temperature compensation type soil water tension meter system and a determination method. The system is composed of a tension meter end and a control center end, wherein the tension meter end and the control center end transmit by virtue of a wireless signal; the tension meter end comprises a tension meter and a data acquisition and processing transmitter; the tension meter is internally provided with a pressure sensor and a temperature sensor; all the sensors are connected with the data acquisition and processing transmitter; the control center end comprises a computer and a receiver; the receiver and the data acquisition and processing transmitter of the tension meter end wirelessly transmit data or instructions. According to the automatic temperature compensation type soil water tension meter system and the determination method, the errors of the tension meter system, caused by the change of environment temperatures, are reduced. Meanwhile, temperature and water content conditions of a soil environment can be subjected to all-weather real-time monitoring; the data acquisition amount is great and the data can be automatically uploaded to a central controller to realize water management.

Description

technical field [0001] The invention belongs to the technical field of automatic monitoring of soil (or matrix) water potential in agricultural facility cultivation and field crop production, and relates to a clay-head water potential sensor (soil moisture tensiometer), which is equipped with a high-precision temperature sensor inside, and then passed through The calculation and analysis of the software is a complete system for temperature correction of the water potential in the measured soil or cultivation substrate, so as to effectively improve the accuracy of field soil water potential measurement, improve the efficiency of crop irrigation and improve the growth of crops. Background technique [0002] In the 21st century, the main constraints to the sustainable development of agriculture in my country are insufficient water resources and uneven distribution of water and soil resources. For the large agricultural water users who use 73.1% of the water, in the case of insuf...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 唐玉邦虞利俊徐磊裴勤曹庆穗王恒义褚芳
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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