Soil Surface Management in the Tropics for Intensive Land Use and High and Sustained Production. - I. Introduction. - II. Land Rainfall and Vegetation. - III. Soil Resources of the Tropics. - IV. Traditional Farming Systems and Soil Productivity. - V. Soil Degradation and Ecological Fragility in the Tropics. - VI. Basis of Improving Traditional Farming Systems. - VII. Components of Technology for Improving Traditional Agriculture. - VIII. An Agroecological Approach to Improving Traditional Agriculture in the Tropics. - IX. Research and Development Priorities. - References. - Effect of Surface Residues on Soil Water Storage. - I. Introduction. - II. Early Studies with Surface Residues. - III. Stubble Mulch Tillage. - IV. Early Chemical Fallow (No Tillage). - V. Chemical Fallow with Improved Herbicides. - VI. Managing Irrigated Crop Residues. - VII. Residue EffectsSubhumid and Humid Regions. - VIII. Surface Residue Effects on Evaporation. - IX. Surface Residue Effects on Water Conservation from Snow. - X. Summary and Conclusions. - References. - Physical Properties and Processes of Puddled Rice Soils. - I. Introduction. - II. The Puddling Process. - III. Puddling Indices. - IV. Effects of Puddling. - V. Regeneration of Soil Structure. - VI. Is Puddling Essential?. - VII. Research Gaps. - VIII. Summary. - References. - Origin Evolution and Classification of Paddy Soils in China. - I. Paddy Soils of China. - II. Distribution of Paddy Soils in China. - III. Genesis of Paddy Soils. - IV. Genetic Horizons of Paddy Soil. - V. Classification of Paddy Soils. - VI. A Suggestion of Paddy Soil Classification in Soil Taxonomy. - References. - Phosphorus Interactions with Other Nutrients and Lime in Field Cropping Systems. - I. Introduction. - II. Interpretive Model. - III. Phosphorus × Nitrogen. - IV. Phosphorus ×Zinc. - V. Phosphorus × Lime. - VI. Phosphorus × Silicon. - VII. Phosphorus × Iron. - VIII. Phosphorus × Copper. - IX. Phosphorus × Potassium. - X. Phosphorus × Sulfur. - XI. Phosphorus × Molybdenum. - XII. Phosphorus × Magnesium. - XIII. Other Interactions. - XIV. A Look to the Future. - References. Language: English