General Preface. Preface to Vol. 6. 1. Energy and Agriculture (L.W. Faidley). 2. Energy Inputs in Production Agriculture (D. Pimentel). 3. Energy of Human Labor (R.C. Fluck). 4. Energy of Agricultural Products (R.C. Fluck). 5. Energy Analysis in Agricultural Systems (R.C. Fluck). 6. Commodity Losses and their Relationship to Energy in Agricultural Systems (M.L. Esmay). 7. Time-related Aspects of Agricultural Energy Use (D. Hunt). 8. Agricultural Energy Costs: National Analyses (V. Smil). 9. Energy Requirements for Land Clearing, Forming, and Ditching (S.F. Shih). 10. Agricultural Field Equipment (W. Bowers). 11. New Technology - Energy Implications (B.A. Stout and M. McKiernan). 12. Energy Conservation in Agricultural Transportation (R.C. Fluck). 13. Energy and Alternatives for Fertilizer and Pesticide Use (Z.R. Helsel). 14. Estimating Energy Use in World Irrigation (G. Sloggett). 15. Energy Requirements for Frost Protection of Horticultural Crops (J.D. Martsolf). 16. Greenhouses: Structure, Heating and Ventilation, and Related Equipment (D.R. Mears). 17. Energy Use in Animal Production (R.A. Bucklin and I.A. Nääs and P.B. Panagakis). 18. On-farm Processing of Plant and Animal Products (C.D. Baird and M.T. Talbot). 19. Economics of Energy in Agriculture (G.E. Grinnell). 20. Social Dimensions of Energy Use in Agriculture (C.G. Harris and G.E. Macheski). 21. Policy for Energy Use in Agriculture (H.F. Breimyer). List of Contributors. List of SI Units and Conversion Factors to SI (V.H.A.M. Oosterbaan). Subject Index.