Copper Sulphate

Copper Sulphate

Copper Sulphate is a soluble copper salt, 25% copper and 12.5% sulphur, used in very small amounts to correct copper 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 crystals)
• Supplier certificate on file: BioGro licence 297. See the certificate and its dates.
• Analysis: copper 25%, sulphur 12.5% (copper sulphate pentahydrate)
• Use for: correcting copper 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

Copper sulphate pentahydrate (bluestone) is a water soluble copper salt that also supplies sulphur as sulphate. It dissolves in water for spraying or irrigation.

What it does

• Copper is used for lignin synthesis, which stiffens cell walls, and for pollen formation, disease resistance and several enzymes.
• Deficiency shows as dying shoot tips, weak stems and poor seed set.
• The sulphate half supplies sulphur, which plants use for proteins, oils and flavour compounds.

Analysis

• Copper (Cu) 25%
• Sulphur (S) 12.5%
• Form: copper sulphate pentahydrate

How to use

• Dissolve in water and spray for even distribution.
• Foliar: 50 to 100 g per 100 L of water (0.05 to 0.1%), one or two early sprays. Test a few leaves first and spray in the cool of the day.
• Soil: apply the rate your soil test or prescription calls for, watered in evenly.
• Copper has a narrow margin between enough and too much and builds up in soil: apply from a soil or leaf test and do not exceed the rate.

Learn more in fifteen seconds

• Copper: 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.