Besides, according to
the value of RMSE (0.0079∼0.0195) of β model, the sensor
accuracy reaches the ‘fair’ rank. In spite, the quadratic is not
inferior to β model, to fit the quadratic model with reasonable
accuracy, a sufficient number of data points are required.
On the other hand, it is reasonable to assume that the β model
is applicable to most soil and soilless substrate through
observing a similarity of calibrations for a wide range of soil
and soilless substrate types respectively. If this is the case,
only two steps (one in the dry media, the other is optional) are
needed to establish β model that is accurate as the quadratic
model. Note that the convex curve of perlite may be explained
by its swelling property, which causes bigger porosity.
Besides, according tothe value of RMSE (0.0079∼0.0195) of β model, the sensoraccuracy reaches the ‘fair’ rank. In spite, the quadratic is notinferior to β model, to fit the quadratic model with reasonableaccuracy, a sufficient number of data points are required.On the other hand, it is reasonable to assume that the β modelis applicable to most soil and soilless substrate throughobserving a similarity of calibrations for a wide range of soiland soilless substrate types respectively. If this is the case,only two steps (one in the dry media, the other is optional) areneeded to establish β model that is accurate as the quadraticmodel. Note that the convex curve of perlite may be explainedby its swelling property, which causes bigger porosity.
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