HIGH PRECISION EASY MEASUREMENT DEVICE FOR LEACHING AMOUNT OF FERTILIZER CONSTITUENT AND ENVIRONMENTAL CONTAMINANT AND THE LIKE

摘要

PROBLEM TO BE SOLVED: To effectively collect infiltrating water without respect to a soil property by comprising first and second infiltration chambers arranged in a soil infiltrating water collecting device and a tensiometer and the like buried in the soil in the vicinity of the collecting device. ;SOLUTION: A leaching amount measurement device measuring a fertilizer constituent and the like in soil infiltrating water is constructed of a collecting device 21 provided with a first infiltration chamber 24, in which water from a sample chamber 41 moves in a capillary sheet 57a so as to be collected, and a second infiltration chamber 31, in which sample water is collected through a porous plate, and a tensiometer 59 connected to a controller 60 and provided with a built-in pressure sensor, and the like. In collection of water from dry soil according to a tension capillary lysimeter method, the infiltration chambers 24, 31 are shut off from the atmosphere and a vacuum pump 65 is operated so that a suction pressure and water condition in the soil are equilibrated, and consequently, water is collected into the inside of the infiltration chamber 31. In the case of a capillary lysimeter method, the infiltration chamber 24 is set to an atmospheric pressure, and water is collected through a rod type capillary part 57b.;COPYRIGHT: (C)2000,JPO