[Cultivation systems on acid sulphate soils in subtropical and tropical areas]

acid soils cereal crops coastal plains cropping systems cultivos de cereales indonesia land use llanura costera manejo del suelo mangles mangroves mise en valeur du sol oryza sativa ph del suelo ph du sol sistemas de cultivo soil management soil ph sol acide sostenibilidad subtropical zones sulfate sulfatos sulphates sustainability tropical zones utilisation des terres viet nam vietnam zona subtropical zona tropical zone subtropicale zone tropicale