According to researcher Vaclav Smil, who was mentioned in
the article, the advent of fertilizers which were composed of
the three chemicals N, P and K was of great importance
for what was called the 1960’s Green revolution.
Concerning the importance of nitrogen fertilizers, choose the
correct alternative.
A liberdade de exercer qualquer trabalho, ofício ou profissão,
com atenção às qualificações profissionais que a legislação
estabelecer, é considerada uma norma constitucional de eficácia