ammonia nitrogen 氨氮;氨型氮,氨基氮
nitrogen content 含氮量;总氮量
total nitrogen 总氮,总氮量
nitrogen fertilizer 氮肥;氮肥肥料
liquid nitrogen 液氮
nitrogen source 氮源;氮源物质
nitrogen fixation []固氮作用 nitrate nitrogen 硝态氮;硝酸盐氮
urea nitrogen 尿素氮;脲氮
nitrogen metabolism 氮代谢
nitrogen concentration 氮浓度
amino nitrogen []氨基氮 nitrogen supply 氮供应
nitrogen balance [生]氮平衡 biological nitrogen fixation 生物固氮;生物固氮酌;生物固氮作用
nitrogen cycle 氮循环
nitrogen flow 氮怜 nitrogen treatment 氮处理