631.84
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Robinson, J. B. D.
The soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on arable soils / J. B. D. Robinson.
— Farnham Royal, Eng : Commonwealth Agricultural Bureaux, 1975. 53 p. : il. ; 25 cm. — (Special publication - Commonwealth Bureau of Soils ; nº 1)
Bibliografía: p. 47-53.
ISBN 0851983405
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