牛蒡是一种高营养价值的根茎类稀有蔬菜,从无公害生产出发,根据牛蒡的生物学特性,选择适宜的栽培地,做好播种、整地、施肥、田间管......

The investigation, analysis,pot-tests and field experiments were conducted to deal with the feasibility to build polluti......

用３－氯－２羟丙基三甲胺氯化物和碱性催化剂的混合物，在干燥条件下，与淀粉（例如玉米淀粉反应，以制备阳离子淀粉，该方法没有任何污染。......