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- Nitrogen and phosphorus 1
- Nitrogen balance 1
- Nitrogen compounds 3
- Nitrogen fertilization 3
- nitrogen fertilization 1
- Nitrogen fertilization. 1
- Nitrogen metabolism 1
- Nitrogen rates 1
- Nitrogen removal 4
- nitrogen removal 1
- Nitrogen sources 1
- Nitrogenous waste 1
- Nitrogênio 17
- nitrogênio amoniacal 1
- Nitrogênio total 2
- Nitrogênio ureico 1
- Nitroprussiato de sódio 1
- nitrous oxide 1
- Nivel de investigación 1
- Niveles de conocimiento 1