USE OF G0LD ORE TAILINGS AS A SOURCE OF MICRONUTRIENTS IN AGRICULTURE
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Date
2004-01-22
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UNIVERSITY OF AGRICULTURAL SCIENCES BANGALORE
Abstract
Gold Ore Tailings (GOT) is the waste developed after the extraction of Gold
using cyanide process. Before disiDosal, GOT sluny was rccKdcd in mill to biing
down the cymiide to minimum possible limit {< 15 ppm). The GOT is lich in
micronutiients j/iz,, total Fe (12,6%), Mn (2.19%), Cu (0.0217%) and Zn (0.008%).
The aged GOT (2-3 years old) was used to conduct laboratory and field
experiments during kharif 2001 to know the effect of GOT and copper ore tailings
(COT) on the release of available Zn, Cu, F^e iuid Mn, soil enzj me activity, growtli,
yield and nuUient uptake of Cauliflower. In laboratory study, GOT and COT with
FYM signiflcantly increased the release of available Zn, Cn, Mn and Fe and
enzyme activity. Maximum release of Zn (1.84 ppm) and Cu (3.26 ppm) was in
COT 1.5 t/ha with FYM and the available Fe (13.68 ppm) and Mn (11.96 ppm)
was in GOT 2.00 t/ha with FYM. The enzjme activity was not significantly
affected by apphcation of GOT and COT compared to control.
In tlie field experiment, different levels of GOT were tried individually and in
combination with different levels of COT. The highest curd diameter (28.62 cm)
and curd yield (25.75 t/ha) was noticed in GOT 1.0 t/ha + COT 0.5 t/ha.
Application of GOT and COT together significantly enhcuiced tlie N, P, K, Zn, Cu,
Fe and Mn uptake by Caidiflowci at all stages of crop growth. However, CN, Pb
and As uptake was below tlie permissible hniit. Ihe residual micronutrients
status of soil was greatly enhanced by apphcation of GOT and COT together.
A])phcation of GOT 1.0 t/ha+ COT 0.5 t/ha has recorded liigher net irtnins
(Rs. 103000 /ha) witli B:C ratio of 2.59 when compracd with the apphcation of
recommended fcrtihser alone.
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