FLOURISH ZnSo4 ( Zinc sulphate heptahydrate )
TECHNICAL SPECIFICATION : Zinc (21%)
Chemical Formula : Zn SO4.7H2O
pH of 10% Solution
Not Less than 4.0
20 PPM Max
Clarity of 40% Solution
It Should be Clear
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Physical Appearance White Crystal soluble in water, slightly soluble in alco
Zn Content 21% +/- 0.5%
Arsenic, AS 1 ppm
Mercury, Hg 1 ppm
Lead, Pb 1 ppm
Cadmium, Cd 1 ppm
Dose and Application method:
Zinc sulphate heptahydrate (Zn-21%) is recommended for soil application at the
rate prescribed by the State Agricultural Universities/Soil Testing Laboratories.
The dose varies across the states from 25 to 60 kg/ha depending on soil type,
cropping intensity and crop productivity levels, to be applied once in two years
Use of 10 kg/ha zinc sulphate every year has also been recommended in some States.
It should not be mixed or applied with phosphate fertilizers, as water soluble zinc is transformed to relatively insoluble zinc phosphate.
Drilling, band placement or broadcasting of zinc sulphate are popular application methods. However band placement is most effective.
Basal (soil) application is always preferred. However, in the absence of basal
application, foliar spray of 0.5 % solution of zinc sulphate heptahydrate 15 days
after transplanting of rice and 30 days after planting of wheat should be practiced. The foliar application should be repeated after 15 days. One kg zinc sulphate plus 0.5 kg unslaked lime dissolved in 200 l water will give 0.5 % zinc sulphate solution. About 500 l of solution will be adequate for one foliar spray of hectare cropped area.