Identifying the true and false four methods of phosphate fertilizer

　　 Phosphate fertilizer is a quick-acting fertilizer. At present, there are many methods to identify the true and false of phosphate fertilizer. There are four methods for identification:

First, observe the color and shape. The standard phosphate fertilizer is grayish white powder. If the color is white or yellow, maybe The acid treatment is incomplete and the phosphorus content is low. If the phosphate fertilizer has been hygroscopically formed, its quality has also been reduced.

Second, smell the smell. The standard fertilizer is slightly sour. If it is odorless, it means that the amount of sulfuric acid is insufficient and the active ingredient is low. If sour taste Concentrate, indicating that the free acid content is high, the fertilizer efficiency is low, and after use, the activity of soil microorganisms is inhibited, the roots are burned, and even the seeds are not germinated.

Third, touch by hand. Generally speaking, the standard The water content of the phosphate fertilizer is 8% - 14% , and it feels cool after touching the hand, but there is no trace. If the water is squeezed out by hand, it indicates that the water content is too high and the quality of the phosphate fertilizer is poor. If the hand touches dry soil, it means that the acid treatment is not complete. The bottom has a low effective phosphorus content.

Fourth, sampling test. Through the sampling test of the designated department, the effective content, water content and free acid content of the phosphate fertilizer are determined, thereby identifying the true and false of the phosphate fertilizer.