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CIGR Handbook of Agricultural Engineering, Volume III Plant Production Engineering, Chapter 1 Machines for Crop Production, Parts 1.1.18-1.1.21 Tractors: Two-Wheel Tractors for Wet Land Farming

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  CIGR Handbook of Agricultural Engineering, Volume III Plant Production Engineering, Chapter 1 Machines for Crop Production, Parts 1.1.18-1.1.21 Tractors: Two-Wheel Tractors for Wet Land Farming, pp. 54-95  .(doi:10.13031/2013.36340)
Authors:   J. Sakai
Keywords:   Keywords: 1.1.18. The Role for Small Scale Farms, 1.1.19. Differences of Farming Principles Between Upland Fields and Paddy Fields for Tractors, 1.1.20. Types and Durability of Two-Wheel Tractors, 1.1.21. Principles of Mechanisms and Mechanics

First paragraph: As a rule, a country is expected to have all industries, primary, secondary and tertiary industries developed in good harmony. In such a case, the percentage of the population employed in agriculture as a part of the primary industry to the total employed population in all industries in any country has a tendency to decrease (Fig. 1.27a) because of the increase in secondary and tertiary industries with national economic development. Figure 1.27b shows howthe decreasing number of people engaged in the primary industry has supported the development of the other industries.

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