Advances in Soil Science

1. Front Matter

   Pages i-ix

   PDF

2. Soil Surface Management in the Tropics for Intensive Land Use and High and Sustained Production

   • R. Lal

   Pages 1-109

   PDF

3. Effect of Surface Residues on Soil Water Storage

   • Darryl E. Smika, Paul W. Unger

   Pages 111-138

   PDF

4. Physical Properties and Processes of Puddled Rice Soils

   • Pradeep K. Sharma, Surajit K. De Datta

   Pages 139-178

   PDF

5. Origin, Evolution, and Classification of Paddy Soils in China

   • Gong Zitong

   Pages 179-200

   PDF

6. Phosphorus Interactions with Other Nutrients and Lime in Field Cropping Systems

   • Malcolm E. Sumner, Mart P. W. Farina

   Pages 201-236

   PDF

7. Back Matter

   Pages 237-242

   PDF

The world needs for food and fiber continue to increase. Population growth in the developing countries peaked at 2. 4% a year in 1965 and has fallen to about 2. 1%. However, in many developing countries almost half the people are under 15 years of age, poised to enter their productive and reproductive years. The challenges to produce enough food for this growing population will remain great Even more challenging is growing the food in the areas of greatest need. Presently the world has great surpluses of food and fiber in some areas while there are devastating deficiencies in other areas. Economic conditions and the lack of suitable infrastructure for distribution all too often limit the alleviation of hunger even when there are adequate supplies, sometimes even within the country itself. World hunger can be solved in the long run only by increasing crop production in the areas where the population is growing most rapidly. This will require increased efforts of both the developed and developing countries. Much of the technology that is so successful for crop production in the developed countries cannot be utilized directly in the developing countries. Many of the principles, however, can and must be adapted to the conditions, both physical and economic, of the developing countries.

• Phosphor
• growth
• nitrogen
• population
• regeneration
• rice
• soil science
• water

• USDA Conservation & Production Research Laboratory, Bushland, USA

  B. A. Stewart

Policies and ethics