nitrogenasen.[生化]固氮酶
nitrogenn.氮
nitrogen equilibrium氮平衡
nitrogen-free diet固氮藻类
nitrogen topdressing表施氮肥
nitrogen-injection注氮气
nitrogen regenerating制氮设备
Nitrogen pipe network氮气管网
Nitrogen-catch crop填闲作物
nitrogen growth index氮生长指数
nitrogen - ammonium氨氮
Nitrogen top dressing追肥