Ferrous sulfate, the chemical name of ferrous sulfate is ferrous sulfate heptahydrate, usually also called green alum. Ferrous sulfate is a sky blue or green monoclinic crystal series, odorless, salty and astringent; it is irritating. At 14.8 degrees: the density is 1.8988g/cm3; at 15 degrees: the density is 1.897g/cm3. The melting point is 64°C, soluble in water, insoluble in alcohol. In agricultural production, ferrous sulfate is often used as herbicides, pesticides, fertilizers, and soil acid-base balance regulators.
When cultivating crops, we must first find out the suitable pH range of the crops to be cultivated, whether it is suitable for acid soil or neutral soil or suitable for alkaline soil. If the soil is too acid or alkaline, it will affect the root growth of plants to a certain extent, thus affecting the normal growth of plants. Generally, crops grow best in neutral, weakly acidic, and weakly alkaline soils.
The soil pH is divided into five levels: strong acid soil (pH less than 5), acid soil (pH 5.0-6.5), neutral soil (pH 6.5-7.5), alkaline soil (pH 7.5-8.5), strong alkali Sexual soil (pH greater than 8.5).
Saline-alkali soil: Ferrous sulfate can also be used to adjust the balance of saline-alkali soil. Soil salinization means that the salt content of the soil is too high (more than 0.3%), which prevents the normal growth of crops. my country’s land salinization is mainly distributed in the North China Plain, the Northeast Plain, the Northwest Region and the coastal areas. Before changing ferrous sulfate to alkaline spring sowing, fertilize with spring ploughing, apply 50 kg of ferrous sulfate chemical modifier to the surface of saline-alkali soil per acre, and then plow into the soil with a rotary tiller or plow. Ferrous sulfate has a quick effect, but the effect is not long, so it needs to be applied frequently.