Can ferrous sulfate and potassium dihydrogen phosphate be used together (a few days are needed before use)

Can ferrous sulfate and potassium dihydrogen phosphate be used together?

Ferrous sulfate and potassium dihydrogen phosphate cannot be mixed at the same time . It is generally recommended to use them separately at some intervals. Because mixed fertilizer application is indeed more convenient, but not all fertilizers can be mixed together.

There have been introductions to mixing fertilizers together before. The most important thing is to ensure that the fertilizer efficiency will not decrease after mixing.

The purpose of applying ferrous sulfate is nothing more than to avoid the current situation of crop chlorosis , or to improve the deficiency caused by iron deficiency chlorosis . For iron supplementation, many friends will put an iron nail or iron block in the flower pot during the flower cultivation process. In this regard, Science and Agriculture advises that this method cannot supplement iron.

The iron ions needed by plants are divalent ferrous ions, while the iron ions naturally oxidized in the soil are trivalent ferric ions. The two are irreplaceable. Placing iron ions in flower pots consumes oxygen during the oxidation process, reducing the absorption and utilization of oxygen by the roots, which is not conducive to plant development.

Potassium dihydrogen phosphate is a commonly used high-efficiency phosphorus-potassium compound fertilizer , which is widely used in the production of vegetables, grains, flowers and horticultural crops. It can promote reproductive growth, improve the quality of crops, and enhance the resistance of plants to stress.

Although the use of ferrous sulfate and potassium dihydrogen phosphate together greatly reduces the workload, mixed fertilization violates the above principles of fertilizer mixing . The phosphate ions of potassium dihydrogen phosphate react with ferrous ions to form ferrous phosphate .

Ferrous phosphate is insoluble in water, which is also one of the raw materials of lithium batteries, but it can be dissolved in acidic solutions. Although potassium dihydrogen phosphate and ferrous sulfate are both acidic, it is really difficult to ensure that ferrous phosphate will be able to dissolve after the reaction.

Therefore, the scheme of applying them together is really not very suitable. Of course, as mentioned before, since the solutions of potassium dihydrogen phosphate and ferrous sulfate themselves are acidic, ferrous phosphate can basically be dissolved, so it is not to say that there is no fertilizer effect.