Nitrogen-free extract是什么意思

用法例句

The sugarcane varieties were treated in pot under non-nitrogen fertilzer condition,which had been derived from stem apical culture and cloned for 4 generations.

取从巴西引进的甘蔗品种B1、B3、B5、B8以及广西主栽品种新台糖16号、桂糖11号的茎尖进行组织培养,对其继代4次的茎尖组培苗进行有氮与无氮培养对比以及温室无氮盆栽品比试验。

66 kg were allocated into 3 groups to feed diets with PPM or soybean meal(SBM)as only protein source,and N-free diet to determine endogenous amino acid excretion to calculate amino acid true digestibility.

以PPM和豆粕(SBM)分别作为唯一蛋白源配制半纯合日粮,采用无氮日粮法测定两者猪回肠末端氨基酸的表观消化率和真消化率。