Numerical Simulation Of Nitrogen Groundwater
Pollution For Proper Management Of
Cow Manure
Author(s)
S. Tsuchiya, T. Furuichi & K. Ishii
Abstract
About 20 million tons of cow manure is generated in Hokkaido, Japan, each
year. Approximately 94% of this manure is reported to be recycled. However,
the actual amounts of cow manure generated and of manure applied to pastures
as compost or soil improver are not entirely clear, and so the reported rates of
cow manure recycling are unlikely to represent the realities of current cow
manure management. It is possible that excessive amounts of manure are being
applied to pastures, leading to nitrate-nitrogen leaching and groundwater
pollution. Therefore, it is necessary to assess the mass balance of nitrogen in the
system to determine appropriate management strategies for cow manure. In this
study, the nitrogen mass balance was calculated for cow manure during all stages
of the process, from its generation to its application as a compost or soil
improver. The nitrogen mass balance was determined through site investigations.
Assuming a typical model of dairy farming, the actual amount of nitrogen
applied in pastures was calculated in terms of nitrogen use efficiency, depending
on vegetation type. The potential for groundwater pollution was evaluated by
numerical simulations based on the nitrogen mass balance. The results showed
that when large amounts of manure are applied to pastures, excess nitrogen will
be present in the system, which may be susceptible to leaching and lead to
groundwater pollution. Methods for cow manure management are discussed
based on the results of the numerical simulations.
Keywords: cow manure, nitrogen mass balance, nitrate, groundwater pollution.
Keywords
cow manure, nitrogen mass balance, nitrate, groundwater pollution.
Related Book
Other papers in this volume
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