Bluestone (Copper Sulphate)
500g powdered concentrate
Bluestone (Copper Sulphate) corrects yellowing in younger leaves, small fruit and flowers. It is soluble and quick acting. Copper is important to citrus trees and vegetables. Deficiency symptoms vary between species and include yellowing of young leaves with green spots at the end of veins. Young leaves can also be curled and spurs stunted. Plants grown with high levels of nitrogen have a higher requirement for copper.
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