Pakistan - Soil fertility in West Pakistan - Report to the government

abonos ammonium sulphate chimie du sol commercialisation conservation des sols coton cotton engrais ensayo factories fertilidad del suelo fertilizer industry fertilizers industria de abonos industrie des engrais marketing mercadeo precios prices prix reconocimiento de suelos soil chemistry soil conservation soil fertility soil surveys sulfate d'ammonium sulfato de amonio testage testing usine