—Contamination of groundwater is a great concern
in many irrigated areas of the world. In irrigated areas of
world, about 90% of land is irrigated with furrow irrigation
method. It is said to be water use efficient method than the
conventional methods but is said to be capable of leaching
large quantities of nitrogen to the groundwater. It is said that
about 40% of the nitrogen applied percolate below the vadose
zone of a clay loam soil which can even more leach from sandy
soils. HYDRUS-2D model was used to analyse different
fertilizer placement strategies in the furrow in order to reduce
nitrogen leaching from a furrows prepared in different soil
textures. Strategies of soil management included controlled or
normal (Sn), compacting furrow bottom (Sc) and covering
bottom of furrow with plastic sheet (Sp). Soils used for analysis
consisted, sandy loam, loam and clay. Considered placements
of fertilizer included fertilizer at the sides and bottom of
furrow (P1) near ridge the ridge top (P2). Results of simulations
obtained with HYDRUS showed that for the considered soil
textures 25% to 60% water can be saved Sc, which can further
be enhanced from 50% to 95% using Sp. Simulated results
revealed that 15% to 99% nitrogen leaching can be reduced by
using fertilizer placement P2. About 10% to 98% reduction in
nitrogen leaching can be achieved if we adopt soil management
strategies reported in this study.
—HYDRUS-2D, leaching, contamination,
nitrogens, groundwater, furrow.
The authors are with Department of Land and Water Management,
Faculty of Agricultural Engineering, Sindh Agriculture University,
Tandojam, Pakistan (email: email@example.com).
Cite:A. A. Siyal and A. G. Siyal, "Strategies to Reduce Nitrate Leaching under Furrow Irrigation," International Journal of Environmental Science and Development vol. 4, no. 4, pp. 431-434, 2013.