Zinc Sulphate

Zinc Sulphate

Zinc Sulphate is a soluble zinc salt, 23% zinc and 11% sulphur, used in small amounts to correct zinc deficiency from a soil test. It suits advanced growers and certified organic growers working to a soil prescription.

At a glance

• Type: trace element salt (soluble powder)
• Supplier certificate on file: BioGro licence 297. See the certificate and its dates.
• Analysis: zinc 23%, sulphur 11% (zinc sulphate monohydrate)
• Use for: correcting zinc deficiency shown by a soil or leaf test
• Rate: apply from a soil test; dissolve in water and spray for even distribution

What it is

Zinc sulphate monohydrate is a water soluble zinc salt that also supplies sulphur as sulphate. It dissolves in water for spraying or irrigation.

What it does

• Zinc is needed to make auxin, the growth hormone, and is a cofactor for many enzymes.
• Deficiency shows as small leaves, short internodes and bunched shoot tips. High soil phosphorus is the usual cause.
• A foliar spray is the fastest way to correct a zinc deficiency.
• The sulphate half supplies sulphur, which plants use for proteins, oils and flavour compounds.

Analysis

• Zinc (Zn) 23%
• Sulphur (S) 11%
• Form: zinc sulphate monohydrate

How to use

• Dissolve in water and spray for even distribution.
• Foliar: 100 to 250 g per 100 L of water (0.1 to 0.25%), two sprays after emergence or transplanting, or one spray to the spring flush on tree crops.
• Soil: apply the rate your soil test or prescription calls for, watered in evenly.
• Zinc has a narrow margin between enough and too much: apply from a soil or leaf test and do not exceed the rate.

Learn more in fifteen seconds

• Zinc: what it does
• Mulder's chart: what blocks what

Handling and storage

• Wear a mask to avoid inhaling particles and open in a well ventilated area.
• Wear gloves and eye protection, and wash hands after use.
• Once opened, keep sealed and dry.