Calibration of nuetron moisture meter and field capacity measurement in a major soil of Bangladesh
1985
Basak, B.C. | Hassan, A.A.
A field experiment was conducted to calibrate neutron moisture meter and measure field capacity in the Bangladesh Agricultural Research Institute Farm, Jamalpur. Regression equation 0=-0.046+0436CR developed from plotting volumetric moisture content against count ratio represents almost the same from the manufacturer's one 0=-044+0.433CR. Therefore, either equation can be used to calculate the volumetric moisture content of the profile. Field capacity values showed variation from 13.10 to 45 percent from 15 cm depth to 120 cm depth, the minimum being in the surface soil. Soils at 75,90,105 and 120 cm depths showed almost similar F.C. values of 42.15%, 400%, 44.50% and 45.00% respectively. Hours of variation to reach field capacity at different depths implied the presence of relatively impervious or clay layer at 60 cm depth, which helps in holding water in the upper layers to meet up the crop water demand through capillary-fringe action and complementary to reduce the frequency of irrigation.
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