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ALFISOLS in the Semi-Arid Tropics

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RA 00112.pdf2.67 MB
International Crops Research Institute for the Semi-Arid Tropics
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International Crops Research Institute for the Semi-Arid Tropics ; Patancheru 502324, Andhra Pradesh, India
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Alfisols in the semi-arid tropics: proceedings of the Consultants' Workshop on the State of the Art and Management Alternatives for Optimizing the Productivity of SAT Alfisols and Related Soils, ICRISAT Center, Patancheru, Andhra Pradesh, India,1-3 Dec 1983 / International Crops Research Institute for the Semi-Arid Tropics
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Distribution, classification, and the major characteristics of red soils of India are described, and the various constraints to crop production reviewed. The problem of identifying argillans to designate argillic horizon in the field is brought out. Characteristic activities of fauna in soil formation, and lack of evidence of clay illuviation in red soils, classified as Alfisols on the basis of micromorphological studies, are highlighted. A detailed soil map of Chagalhatti village near Bangalore is featured to show that soils differ in their physical characteristics within a village; their quality varies with depth, occurrence, and amount of gravel in the profile; texture of the subsoil and nature of soil-forming materials; and surface texture variations, slope, and erosion. Finger millet yields, with two levels of management under rainfed and irrigated conditions, are given. The importance of information on properly classified soils and their distribution in the  transfer of technology and for research based on models of soil moisture and other behavioral characteristics of soils, and on the conservation of inputs and their proper use, is brought out.  
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