Copper Sulfates Solution
A copper sulfate solution used to correct and prevent copper deficiency in a wide range of agricultural and horticultural crops. Copper sulfate solution can be applied to soils or as a foliar application for broadacre farming and horticultural production where copper deficiency may occur.
Copper (Cu) - 67 g/l (as sulfate)
Sulfate (S) - 34 g/l (as sulfate)
pH - 5.3
Specific gravity (SG) - 1.24
Colour – a clear blue aqueous liquid
Foliar sprays are the most effective way of applying copper sulfate solution. If applied directly to the soil the copper can become unavailable in acidic low pH soils. It will also leach from acid sandy soils that are low in organic matter.
Apply copper sulfate solution to actively growing plants, mid to late tillering. Reapply as necessary.
Copper can be applied by boom spray and aerial in broadacre crops. For best results in field crops use 80-100 litres of water per hectare. If using low volume spray equipment avoid application when the temperature exceeds 30 C. Uptake is improved by spraying in the cool of the mornings and evenings.
Always use good quality water that is low in salts for foliar spraying.
Copper deficiency occurs mainly in low pH soils, sandy soils that are low in organic matter, lateritic ironstone soils and in organic soils (peats). Uptake of copper decreases with increased soil pH and is adversely affected by high levels of available iron (Fe). Cereal crops, potatoes, and fruit crops grown on acidic sandy soils are particularly sensitive to copper deficiency. Symptoms are generally difficult to see and are referred to as “hidden hunger”.
- Twisting of the flag leaf in cereals
- Yellowing of the new growth in severe deficiencies
- Patchy appearance of the crop
- Poor seed set