How to recognize metamorphic ferrous sulfate?

Green vitriol ferrous sulfate is easily oxidized to ferric sulfate in air, which is not easy to be absorbed by crops and then go bad soon. How to recognize metamorphic ferrous sulfate when buying? The simplest method to recognize whether ferrous sulfate go bad is to use potassium thiocyanate as identification reagent. The detailed steps: firstly, pour the ferrous sulfate solution in a beaker, and then slowly trip into potassium thiocyanate solution. If the mixture solution turned red, it means the ferrous sulfate go bad. The simple reason is that this reagent potassium cyanide would become blood red and form a kind of complex which's difficult to decompose when meeting with Fe3+. Potassium thiocyanate method in metamorphic ferrous sulfate identification is simple and accurate. If you doubt your purchased ferrous sulfate heptahydrate and ferrous sulfate monohydrate, you can use this simple method to identify it. The shelf life of ferrous sulfate is generally about half a year. Improper preservation method would cause product deterioration, so stock the well sealled products in cool and ventilated condition after purchasing.

How to fertilize greenhouse planted strawberry scientifically

Strawberry is delicious and full red juicy pulp, which contains high nutrition and rich vitamin C, etc. Compared with other fruits, greenhouse planted strawberry requires more adequate nutrients, especially nitrogen, phosphorus, potassium and manganese sulfate micronutrient fertilizer, etc. 1. The base fertilizer. Before planting, fertilize sufficient rotten organic manure at one-time. The dosage for each acre is not less than 2000 kilograms of chicken manure or 5000 kg manure. Moreover, the proper amount of P and K can be added after fully mixture. 2. Top dressing. General, from the tent covering to buds coming, it’s better to fertilize potassium sulphate compound fertilizer mainly, 20 kg for each acre, 10 days or so a time. 3. Exo-root top dressing. In order to improve the fruit weight and sugar content to make the taste more delicious and good prices, the fertilization is usually combined with foliar spraying in middle later period. The foliar fertilizers contain 0.3% ~ 0.5% of urea solution, 0.3% ~ 0.5% of potassium dihydrogen phosphate solution, 0.1% ~ 0.3% of boric acid solution, 0.03% of manganese sulfate solution, etc. In both budding period and flowering period, it all can be applied top-dressing.

Industry News of Zinc sulfate comes from Rech Chemical

Seen from international market as a whole, including zinc sulphate, sulfate salt market is not very active recently. The American and Australian markets, which used to be active, have shown fatigued and weak. At present, the domestic price of zinc sulfate has dropped to the lowest price since June 2012. Market’s compression and low-cost operation of the market has caused many small-scale zinc sulfate factories to make a concession. Due to insufficient working financial capital, they have to shut down and step into the equipment maintenance. The Sulfate product prices may temporarily consistent with the price in April. However, since the middle of this April, zinc sulphate and manganese sulfate had dropped their price in different degree. Now, for your reference only, the domestic zinc sulfate monohydrate granule factory price on the market is generally RMB5500-6000/T.

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