Although calcium magnesium phosphate and superphosphate are of chemical fertilizer, but its chemical composition and physical properties are very different, the former as a white or off-white powder, hygroscopic and corrosive phosphorus content of about 16% -18%, are acidic Chemical phosphate fertilizer; the latter is gray or dark green, non-hygroscopic, non-caking, can be stored for a long time, phosphorus content is about 14%-18% , is an alkaline chemical fertilizer, so there is a big difference in use.
First, the soil is suitable for application. Calcium superphosphate is acidic, applied to calcareous and neutral soils, and most of them can produce salts absorbed by crops. When applied to acidic soils, the main component of monocalcium phosphate is free iron and aluminum in soil. The ion exchange reaction forms an insoluble phosphate, so it is particularly required to be mixed with organic fertilizer and applied to a dense root zone to reduce contact with the soil. Calcium, magnesium and phosphorus fertilizers should be applied to slightly acidic or acidic soils, and the effect is best. It is applied as a full layer of base fertilizer to accelerate the release of available phosphorus, which is beneficial to crop absorption and utilization.
Second, the fertilizer effect is fast and slow. Calcium superphosphate is a water-soluble phosphate fertilizer, and the fertilizer effect is fast. It can be used as a base fertilizer, or as an early top dressing or a top dressing. FCMP as citrate-soluble phosphate, fertilizer slower, in general, it is preferably administered 1-2 times than months ahead of superphosphate, as the base fertilizer for the appropriate application, as foliage, crops The leaf surface is not easily absorbed, so the effect is poor. Two kinds of phosphorus contained in the phosphorus almost the same, but because of the slow calcium magnesium phosphate fertilizer, fertilizer long, one-time administration and therefore the amount of calcium phosphate than 50%. An alternative method can be used to increase the utilization rate.
Third, the two kinds of phosphate fertilizers cannot be mixed and applied because of different pH. SSP administration should not be mixed with lime, ash and other alkaline fertilizer, calcium magnesium phosphate can be mixed with ammonium sulfate, ammonium chloride and other acidic fertilizers, chemical reaction in order to avoid reducing fertilizer. Superphosphate contains a large amount of calcium sulfate, which is used to supplement sulfur nutrition in sulfur-deficient soils; calcium-magnesium phosphate has the ability to supply elements such as calcium and silicon, so it is suitable for calcium legumes and silicon. rice, wheat administration, the effect will be better.
Fourth, the storability is different. Calcium superphosphate is easy to absorb moisture and agglomerate, and it is corrosive. If the storage time is long, some water-soluble phosphorus will turn into insoluble phosphorus, and the higher the humidity and temperature, the faster the transformation speed. Calcium, magnesium and phosphate fertilizers do not absorb moisture and agglomerate, and are non-corrosive and resistant to storage. Therefore, it is recommended to use calcium superphosphate for current use. When it is necessary to store phosphate fertilizer, it is advisable to purchase calcium magnesium phosphate fertilizer.
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