TY - JOUR
T1 - New monitoring system for real time continuous measurement of nitrate concentration in unsaturated soils
AU - Yeshno, Elad
AU - Dahan, Ofer
AU - Arnon, Shlomi
PY - 2018/4/1
Y1 - 2018/4/1
N2 - Over the past few decades, a clear trend of rising nitrate concentration
in groundwater had been observed in aquifers all around the globe.
Numerous studies had linked the growing concentration of nitrate in
groundwater to agriculture activity and excess use of fertilizers.
Up-to-date fertilizer application in agriculture relay primarily of
farmers experience, expert's recommendation and sporadic soil testing.
All of which do not provide information that is in line with the time
scale of N-fertilizers mobilization, consumption and transformation
dynamics in the soil. As such in-situ continuous measurement of nitrates
in the soil is essential for maximizing the crop yield and at the same
time to reduce potential contamination of groundwater. In this talk, we
present a newly developed monitoring system for continuous measurement
of nitrate concentration in unsaturated soil. The monitoring system
consists of a suction lysimeter coupled to a custom-made optical flow
cell. The system was designed for real-time measurement of nitrate
concentration in soil's porewater based on absorption spectroscopy
methods that is applied through optical fibers technology. Additionally,
a special adaptive algorithm was developed in order to optimize the
measurement accuracy. Furthermore, the algorithm cancels interference
and masking caused by different chemical constituents present in the
porewater sample by signal processing for the optical domain.
Preliminary measurement performed on soil column exhibit high accuracy
of nitrate over large a concentration range between tens to hundreds
ppm. Comparing between the nitrate concentrations in acquired water
samples from suction lysimeter, to concentration values attained by the
monitoring system, gave an adequate correlation of R2=0.89. Moreover,
the system provided a first-time outstanding explicit data on the
complexity of the temporal variation of nitrate concentration in the
soil during the irrigation cycles. Accurate online nitrate measurements
in the root zone can be valuable to farmers as a report of the current
nutrient ability to crops, and in turn, can reduce the potential of
groundwater pollution by nitrate leaching under cultivated land.
AB - Over the past few decades, a clear trend of rising nitrate concentration
in groundwater had been observed in aquifers all around the globe.
Numerous studies had linked the growing concentration of nitrate in
groundwater to agriculture activity and excess use of fertilizers.
Up-to-date fertilizer application in agriculture relay primarily of
farmers experience, expert's recommendation and sporadic soil testing.
All of which do not provide information that is in line with the time
scale of N-fertilizers mobilization, consumption and transformation
dynamics in the soil. As such in-situ continuous measurement of nitrates
in the soil is essential for maximizing the crop yield and at the same
time to reduce potential contamination of groundwater. In this talk, we
present a newly developed monitoring system for continuous measurement
of nitrate concentration in unsaturated soil. The monitoring system
consists of a suction lysimeter coupled to a custom-made optical flow
cell. The system was designed for real-time measurement of nitrate
concentration in soil's porewater based on absorption spectroscopy
methods that is applied through optical fibers technology. Additionally,
a special adaptive algorithm was developed in order to optimize the
measurement accuracy. Furthermore, the algorithm cancels interference
and masking caused by different chemical constituents present in the
porewater sample by signal processing for the optical domain.
Preliminary measurement performed on soil column exhibit high accuracy
of nitrate over large a concentration range between tens to hundreds
ppm. Comparing between the nitrate concentrations in acquired water
samples from suction lysimeter, to concentration values attained by the
monitoring system, gave an adequate correlation of R2=0.89. Moreover,
the system provided a first-time outstanding explicit data on the
complexity of the temporal variation of nitrate concentration in the
soil during the irrigation cycles. Accurate online nitrate measurements
in the root zone can be valuable to farmers as a report of the current
nutrient ability to crops, and in turn, can reduce the potential of
groundwater pollution by nitrate leaching under cultivated land.
M3 - Meeting Abstract
SN - 1029-7006
VL - 20
JO - Geophysical Research Abstracts
JF - Geophysical Research Abstracts
ER -