Agriculture Case studies Cropping systems Demography Field Crops, (New March 2000) Forest plantations Land Resources Land management Land use Plant Cropping Systems Plantations Pollution and Degradation Population growth Saccharum Saccharum officinarum Silviculture and Forest Management Soil Chemistry and Mineralogy Soil Fertility Soil Surveys and Land Evaluation Soil degradation Soil fertility Soil resources Soil test values Spatial variation Sugarcane Sustainability Temporal variation Tropics