Social sciences (2) Ciencias sociales (2) Programs (1) Labor (1) Biomass (1) Women chemists (1) Origin (1) Stocks (1) Soils (1) Prices (1) Population (1) Pollution (1) Plantations (1) Phosphates (1) Petroleum (1) Organic fertilizers (1) Matter (1) Leaves (1) Fertilizers (1) Farm manure (1) Character (1) Carbon (1) Bacteria (1) Adsorption (1) Absorption (1) Ability (1) Programas (1) Biomasa (1) Estiércol (1) Origen (1)