In order to make timely irrigation decisions, fertilization decisions and drainage measures, it is important to ascertain the profit and loss of soil moisture during crop growth and development, and it is particularly important to quickly and accurately determine soil moisture in farmland. In the past, the shishi drilling method has been considered as the most classic and most accurate method, but the shishi drilling method generally can only measure the soil moisture content, and must first know the soil bulk density to obtain the volumetric water content or the soil water storage capacity, and Because soil samples cannot be restored in situ, it is difficult to monitor soil moisture dynamics at fixed sites. Although the gypsum resistance block method can be determined at a fixed point, the measurement results are often affected by factors such as soil type, salt concentration, and ambient temperature. The tensiometer can only measure the matrix potential of the soil, and only the known soil moisture characteristic curve can estimate the soil moisture content. In recent years, the application of soil moisture quickness tester has become more and more common, and its role has also been accepted by the majority of researchers.
The function of the soil moisture quickness meter mainly depends on its sensor function. Three probes (numbered 1, 2 and 3) are randomly selected for testing. The length of the probe is 6 cm. The soil samples tested are three typical texture soils. : Sand, loam, clay, acid soil, saline soil were also tested. Three replicates of each soil were tested. The soil moisture content of the series was obtained during the natural air-drying process of the soil. The soil mass was loaded in layers with constant volume loading. When the soil water potential dropped below about 15 bar, the measurement was stopped. The sensor reading uses a digital voltmeter to determine the volumetric moisture content as a function of instrument readings.
The superiority of the sensor for soil moisture velocity meter mainly manifests in the following aspects:
1) In the experiment, a data acquisition system was used to connect the sensor to the computer to implement on-line data processing. At the same time, using the database for storage at any time is a new breakthrough for the rapid and continuous observation of soil moisture dynamics.
2) The sensor measures high linearity, and the correlation coefficient for the normal soil is 14% to 50% (volume water content) and the correlation coefficient is above 0.98. Other types of soil correlation coefficients are also above 0.92.
3) The stability of the sensor is high, generally it can be stabilized within 10s, and then the wave shape is reduced. The total drop amount is 0.8% within 30min, which can meet the practical application requirements.
4) The dispersion of the instrument readings is not sensitive to the soil texture, which is very favorable for the applicability of the sensor.
5) The measurement range is wide, covering sandy soil, loam, clay, acid soil and saline-alkali soil. Only the measurement accuracy of saline-alkali soil is slightly lower, but it has reached the precision requirement of practical application. Other types of soil have high Accuracy.
The function of the soil moisture quickness meter mainly depends on its sensor function. Three probes (numbered 1, 2 and 3) are randomly selected for testing. The length of the probe is 6 cm. The soil samples tested are three typical texture soils. : Sand, loam, clay, acid soil, saline soil were also tested. Three replicates of each soil were tested. The soil moisture content of the series was obtained during the natural air-drying process of the soil. The soil mass was loaded in layers with constant volume loading. When the soil water potential dropped below about 15 bar, the measurement was stopped. The sensor reading uses a digital voltmeter to determine the volumetric moisture content as a function of instrument readings.
The superiority of the sensor for soil moisture velocity meter mainly manifests in the following aspects:
1) In the experiment, a data acquisition system was used to connect the sensor to the computer to implement on-line data processing. At the same time, using the database for storage at any time is a new breakthrough for the rapid and continuous observation of soil moisture dynamics.
2) The sensor measures high linearity, and the correlation coefficient for the normal soil is 14% to 50% (volume water content) and the correlation coefficient is above 0.98. Other types of soil correlation coefficients are also above 0.92.
3) The stability of the sensor is high, generally it can be stabilized within 10s, and then the wave shape is reduced. The total drop amount is 0.8% within 30min, which can meet the practical application requirements.
4) The dispersion of the instrument readings is not sensitive to the soil texture, which is very favorable for the applicability of the sensor.
5) The measurement range is wide, covering sandy soil, loam, clay, acid soil and saline-alkali soil. Only the measurement accuracy of saline-alkali soil is slightly lower, but it has reached the precision requirement of practical application. Other types of soil have high Accuracy.
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