科研之友
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摘要
Poor agricultural practices have degraded most of the world's total cultivated area. Various studies have shown that almost 50% of the arable land in Asia has been degraded due to sealing, compaction, erosion, and disturbance through mining, irrigation, application of agro chemicals, contamination and desertification. (Jayakody, 200 1).
- 出版日期2008
