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制备尿素为心核 ,尿醛树脂为粘结剂 ,磷肥、钾肥为外包裹材料的缓释肥料 ;测试并对比国内外同等浓度肥料的溶解释放。
Preparation of urea as the nucleus, urea-formaldehyde resin binder, phosphate fertilizer, potash fertilizer for the outer package of slow-release fertilizer; test and compare the same concentration of domestic and international fertilizer dissolution release.