Soil under shifting cultivation / P.H. Nye and D.J. Greenland. Nye, P. H. Greenland, D. J. (David J.), 1940- Soil fertility. Crops and soils. 631.4 NYS Includes bibliographical references and index. Farnham Royal, England : Commonwealth Agricultural Bureaux, c1960. c1960. 1960 Text vi, 156 p. : eng