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１９９６年颁布的《农作物种子检验规程》明确规定：棉花种子与玉米种子的发芽试验必须用砂床，化学药品处理过的种子样品发芽所用的砂子不再重复使用。这主要是因为砂子消毒不尽会引起次生感染，造成试验结果不准确，直接影响到种子质量和等级。泽普县每年生产几千吨棉花种子
1996 promulgated the “Crop Seed Inspection Regulations” clearly stipulates: cotton seed and corn seed germination tests must use a sand bed, chemical treatment of seed samples of sand used to sprout the sand is no longer reused. This is mainly because sand disinfection will not cause secondary infection, resulting in inaccurate test results, a direct impact on seed quality and grade. Zepu County produces thousands of tons of cotton seeds each year