Biological efficiency in agriculture :
SPEDDING, C.R.W.,
Biological efficiency in agriculture : - ed. - London : Academic Press, 1981. - 383 p.
Includes bibliographical references and index.
0126565600
Field crops
Biological efficiency in agriculture : - ed. - London : Academic Press, 1981. - 383 p.
Includes bibliographical references and index.
0126565600
Field crops