难检字字典在线查询

汉语拼音：dàn féi

氮元素起主要肥 效的肥料。如硫酸铵、尿素等。合理施用能促进作物茎叶繁茂，分蘖增多，提高产量，改善品质。

1. 氮素肥料。以氮为主要养分的肥料，可以促进农作物茎和叶的生长。无机氮肥有硫酸铵、硝酸铵等，有机氮肥有厩肥、绿肥、人粪尿等。

• In areas of poor soils, within two years of cultivation, synthetic nitrogen and mineral fertilizers have to be applied heavily.

  在土壤养分贫乏的地区，经过两年内的种植后就必须很大量应用合成氮肥与矿物肥料。

• This seems to be its main advantage for irrigated wheat over applying all the N before planting.

  这似乎是灌溉田小麦分施氮肥比播种前一次施用所具有的优点。

• Since the 1960s the amount of fertiliser used by farmers has increased sixfold, and not all of that extra nitrogen ends up in their crops.

  自从1960年代，农夫使用的肥料增加了六倍，而且并不是所有氮肥都被农作物吸收；

• Liquid ammonia, mainly used as refrigerant or to make Ammonium and nitrogen, is an important yet dangerous chemical.

  液氨主要用作制冷剂及用于制取铵盐和氮肥，是化学工业中一种重要的、存在危险性的化学品。

• The nitrogen fertilizer dosage of the Chinese paddy rice occupied 37% of that of the whole world's.

  中国水稻氮肥用量占全世界水稻氮肥总用量的37%。

• Asia is expected to produce a rapidly increasing surplus of nitrogen, but will continue to import phosphate and potash.

  亚洲氮肥生产过剩的情况预计将迅速增加，但将继续进口磷肥和钾肥。

• All over the world, increase the nitrogen fertilizer application rate is an important measure to increase maize production right now.

  就目前全球情况而言，增加氮肥的施用量是提高玉米产量的一条重要措施。

• The heat tube corrosion guards were developed to replace the tube corrosion guards used in small scale nitrogen fertilizer plants.

  开发设计的热管式预腐蚀器，用于替代小氮肥厂原用的普通列管式预腐蚀器。

• These strains were used for further study for influence of nitrogen levels on their nodulation and nitrogen fixation efficiency.

  研究了接种根瘤菌时，氮肥水平对大豆结瘤固氮和产量影响的小区试验。