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j d colwell
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Estimating fertilizer requirements
J. D. Colwell · CAB International
262 sayfa · 1994
Fertilizer requirements / Statistical methods / Mathematical models / Fertilizers and manures
OESTRID FLIES: BIOLOGY, HOST-PARASITE RELATIONSHIPS, IMPACT AND MANAGEMENT; ED. BY D.D COLWELL
D. D. Colwell, M. J. R. Hall, P. J. Scholl · CABI Pub.
364 sayfa · 2005
Insects (entomology) / Medical parasitology / Taxonomy & systematics / Veterinary bacteriology, virology, parasitology / Science/Mathematics
Computations for studies of soil fertility and fertilizer requirements
J. D. Colwell · Commonwealth Agricultural Bureaux
297 sayfa · 1978
Data processing / Fertilizers / Soil fertility
National soil fertility project
J. D. Colwell · CSIRO Division of Soils in collaboration with state departments of agriculture and the fertilizer industry
Sayfa sayısı yok · 1900
Soils / Soil fertility