Report on the second international training center on soil fertility - Himayat Sagar, India, 18 Jul - 15 Oct 1955.

abonos analyse de sol arroz centre de formation classification des sols cropping systems docentes documentation engrais enseignant experimentation fertilidad del suelo fertilizers nutrition des plantes plant nutrition programme de formation rice riz sistemas de cultivo soil analysis soil classification soil fertility teachers teaching methods training centres training programmes