TY  - BOOK
AU  - Tisdale, Samuel L.
TI  - Soil fertility and fertilizers
U1  - 631.45' 8 L0;1 
PY  - 1970///
CY  - London
PB  - Macmillan
KW  -  Samuel L. Tisdale (and) Werner L. Nelson.
KW  - Nelson, Werner L.,joint author
KW  - Soil fertility,Fertilizers,Manures,Plant-soil relationship,Cropping systems
ER  -