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Estimating fertilizer requirements : a quantitative approach / J.D. Colwell.
by Colwell, J. D.;
Year: c1994., Callno: 519.24 COL
Book
INTERPS : a computer program for estimating chemical analysis from light intensity measurements recorded with colorimetric methods of analysis
by Colwell, J. D.;
Callno: 05:631.4(94)
Serial
The computation of optimal rates of application of fertilizers from quadratic response functions
by Colwell, J. D.;
Callno: 05:631.4(94)
Serial
A comparison of designs of field experiments for the National Soil Fertility Project
by Colwell, J. D.;
Callno: 05:631.4(94)
Serial
Computations for studies of soil fertility and fertilizer requirements / by J.D. Colwell.
by Colwell, J. D.; Commonwealth Agricultural Bureaux.;
Year: 1978., Callno: 631.452 COL [Q]
Book
National Soil Fertility Project
by Colwell, J. D.; CSIRO Division of Soils.;
Year: 1977-1979., Callno: 631.452(94) COL
Book
Statistical procedures for developing general soil fertility models for variable regions
by Raij, B. van.; Colwell, J. D.; Suhet, A. R.;
Callno: 05:631.4(94)
Serial
A survey of soils, and some aspects of soil fertility in the Lismore District, New South Wales
by Nicolls, K. D.; Colwell, J. D.; Tucker, B. M.; CSIRO Division of Soils.;
Callno: 05:631.4(94)
Serial
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