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.
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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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