建议对GB18877-2002有机-无机复混肥料标准增补腐植酸的质量指标及其测定方法
건의대GB18877-2002유궤-무궤복혼비료표준증보부식산적질량지표급기측정방법
Humic acid quality and its determination method should be supplemented to the national standard GB18877-2002 of organic-inorganic compound fertilizer