Smell the smell. The standard calcium is 3.5% to 5% free of acid, which can smell a touch of acid. If the smell is too light, it means that the acidification is insufficient; if the smell is too thick, it means excessive acidification; if there is a very pungent smell and sourness, it means that the waste sulfuric acid is added in the production, which is inferior calcium and is toxic.
Touch by hand. The standard calcium content of the high-quality calcium is not more than 14%. It has a cool feeling when touched by hand, but there is no trace on the hand. The excessively wet calcium will stick to the hand, and the dry quality will be rough. The two kinds of calcium are low in quality and poor in fertilizer efficiency.
Observing the pores. High-quality calcium can see a lot of tiny pores on the larger particles, the handcuffs are brittle, and the water is slightly slippery. Adulterated, there are fewer stomata, the handcuffs are not easy to break, and the slipperiness is poor.
Color method. Put some calcium in the carrot juice, such as from purple to red, put a little calcium in the leek juice, such as from red to deep red, it means that the quality of calcium is good, and vice versa.
Soil and fertilizer room of Agricultural Technology Extension Station, Tongzhou District, Beijing
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