TY  - BOOK
AU  - Widdowson, J. P.
TI  - Zinc deficiency on the shallow soils of niue. II. Effects of zinc sulphate on the yield and nutrient composition of crotalaria and sweet corn
KW  - Zinc
KW  - Efecto en plantas
N1  - Sobretiro de: New Zealand Journal of Agricultural Research . 9(3):748-770, 1966
ER  -