Field calibration of neutron probe and its application in measuring soil water content on sloping land
Mingan Shao · Ganhan diqu nongye yanjiu · 2003
Neutron probe is appropriate equipment for measuring soil water content continually and dynamically. The method for field calibration of neutron probe was introduced and the results measured by neutron probe and oven drying methods were compared in this paper. The results showed that neutron probe could be well calibrated at different soil layers, such as at 10, 20-30, and larger than 40 cm layers, respectively. Soil water content measured with neutron probe was a little different with that measured with oven drying method, which was caused by the variability of soil physical properties and difference of micro-topography on sloping land. Other apparatus with higher precision was needed when soil water content at upper soil layers was measured during rainfall infiltration and soil water redistribution.