TY  - REP
AU  - Janssen,B.H.
AU  - Eijk,D.van der
AU  - Guiking,F.C.T.
AU  - Reuler,H.van
AU  - Smaling,E.M.A.
AU  - Wolf,J.
ED  - Symposium organized by the International Society of Soil Science (ISSS)
TI  - A system for quantitative evaluation of soil fertility and the response to fertilizers
SN  - 90-220-0973-4
U1  - 89-041015 
PY  - 1989///
KW  - Crop yield
KW  - AGROVOC
KW  - Evaluation
KW  - Fertilizer application
KW  - Zea mays
KW  - Soil fertility
N1  - 5 refs.; Summary (En)
T2  - Bouma, J. (Landbouwuniversiteit Wageningen (Netherlands). Vakgroep Bodemkunde en Geologie); Bregt,-A.K. Land qualities in space and time. Wageningen (Netherlands). Pudoc. 1989. p. 185-188
ER  -