Report of the meeting on soil fertility and fertilizers for the Latin American region - Turrialba, Costa Rica, 6-11 May 1957.

abonos analyse de sol classification des sols crops cultivos deficiencia de minerales deficiency diseases engrais ensayo exigence des plantes experimentation fertilidad del suelo fertilisation fertilizer application fertilizers maladie de carence mineral deficiencies necesidades de las plantas plant requirements plant tissues plante de culture reconocimiento de suelos soil analysis soil classification soil fertility soil surveys tejidos vegetales testage testing