How to identify the pros and cons of compound fertilizer
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After grasping the hand and grasping the compound fertilizer by hand, if there is a layer of grayish white powder on the hand and it has a sticky feeling, the fine white crystal can be seen in the granules, indicating that it is an excellent product; if there is a layer of gray-black powder on the hand and No stickiness, no white crystals in the particles, it indicates that it is a poor quality product.
It is generally odorless to smell the compound fertilizer with the nose. If there is an odor and the odor is heavy, it can be judged as a poor quality compound fertilizer. Such "complex fertilizer" will cause burning of the seedlings after use, and the crops will be rejected, and the toxicity remains for a long time, which will affect the growth of the next season crop.
Use a small amount of compound fertilizer to burn on the iron and burn it in an open flame. At this time, the ammonia odor indicates that nitrogen is contained, and the yellow flame indicates potassium. The thicker the ammonia smell, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better compound fertilizer; otherwise, the inferior compound fertilizer.
The water-soluble high-quality compound fertilizer has good water solubility, and most of the water can be dissolved by immersion in water, and even if there is a small amount of precipitate, the precipitate is fine. The inferior compound fertilizer is more difficult to dissolve in water, and its residue is rough and hard. Both can see the truth in the water.