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Copper sulfate, often of a beautiful bright blue that could be that of an eyeshadow, except that, in powder or other form, it is used for plants. It's a useful and natural substance, however, can be toxic if used without proper precautions.
Copper sulfate: what it is
Also called cupric sulfate, is a chemical compound based on copper and sulfur and oxygen, its CuSO4 formula and it can be found as salt in different forms. It depends on the degree of hydration which can also change the color. IS' light green or greyish white in its anhydrous form, CuSO4, is instead of that bright blue of which we have already mentioned, in pentahydrate form, CuSO4 5H2O, which is the most common.
We find copper sulphate above all pentahydrate, used in agriculture as a fungicide fungicide. There are also less frequent cases in which this salt also plays the role of fertilizer.
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Copper sulphate for olive trees
The olive tree is one of the plants that is often treated with the copper sulphate together with the vine, citrus fruits and other fruit plants such as apricot, apple and pear. Copper sulfate works and is also used on some horticultural and flower crops, on the main ones.
For the olive tree as for other plants, this substance represents a important method of prevention to the main cryptogams among which we find some names known to those who grow fruit plants in general, olive trees, and even flowers: downy mildew, scab, peach blister, botrytis, alternariosis and acid rot of the vine. To act, inside the copper sulphate, is in particular the copper ion which is obtained when the sulphate is dissolved in water. If plants get injured, copper sulfate also has a healing effect.
Copper sulphate: toxicity
When used in large quantities, this product, despite being natural, it can be harmful to plants to which it is applied. This does not mean that it should be considered toxic in its entirety, but it is important that, when using it, the doses are respected. When an exaggerated amount is used, plants absorb the metal through the leaves and can suffer serious damage.
We often find the copper sulphate mixed with the lime to get the Bordeaux mixture And it is not a case. This combination allows you to lower the pH, bringing it closer to that of the leaves and therefore making the intervention less harmful.
Copper sulphate for fumaggine
Also there fumaggine it can be fought with copper sulphate which has different applications, always inherent to plants and gardening. Also used in organic farming, it can also be a fertilizer, as well as a fungicide to be applied for preventive purposes, for example on peach trees, at the end of winter.
In fact, products like this should never be used when there are already buds on the plants: they could remain seriously damaged. Attention also to bees and insects that do not like the presence of copper sulphate.
Copper sulfate: price
Copper sulphate, purchased online has very low prices and you can find it at 9 euros per kg. Mixed with lime, it makes the Bordeaux mixture, perfect for fighting or preventing the downy mildew of the vine, of the tomato, of the potato. This is just one of many applications.
Copper sulphate: crystals
We mainly talked about the pentahydrate form of this sulphate because it is the most stable in nature and therefore the one we can most easily find in calcantite and not only. The other forms are anhydrous and trihydrated, which absorb water to become pentahydrate, is that heptahydrate that the water must on the contrary lose it.
In nature, however, we also find the anhydrous form as it is, in chalcocyanite, a secondary mineral, rare but not impossible to find. Other hydrated forms can be found in bonattite (trhydrate) and in boothite (heptahydrate).
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