A look at the packaging, whether it is standardized. Including product registration certificate, product technical indicators, product validity period;
Second, see whether the material is uniform. Product water content is too high or too low are not conducive to the survival of bacteria species, determine the method: grasping a handful of fertilizer observed in the sun, was a group of gray tide, dry ash are not normal products.
Three to see whether the effect is efficient. Test method: add a small amount of water to transfer the bio-organic fertilizer into a lump and place it in ice in the refrigerator. Take it out the next day and dissolve it. Repeatedly three times, the bacteria in the fertilizer will be frozen or greatly reduced; this is Use it to compare with the original product and observe the difference in the same field. The difference is obviously a good fertilizer. The difference is not obvious, indicating that the product has problems and it is recommended to abandon the use.
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