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A look at the ratio of NPK. For example, the commonly used high-potassium formula, according to the nutrient requirements of the general crop during the fruit setting period, the ratio of nitrogen:phosphorus:potassium is best at 2:1:4, and the effect of the ratio is very different.
Second, look at the trace elements are incomplete, the ratio is reasonable. Good water soluble fertilizer, 6 kinds of trace elements must be contained, and there must be a scientific ratio, because there is a problem of antagonistic and synergy between the various nutrients, not one or a few elements are high, and It is better to be scientifically reasonable.
Look at the good content of water soluble fertilizer is industrial grade or even food grade raw materials, high purity, and will not add any filler, so the content is relatively high, 100% are nutrients that can be absorbed by crops The NPK content is generally 60% or higher. Poor water-soluble fertilizers are generally low in content, and for each additional content, the cost will vary and the price of the fertilizer will vary.
Look at the water solubility to identify the water solubility of water soluble fertilizer only need to dissolve the fertilizer into the clear water, see if the solution is clear and transparent, if the water is the same as the water, except the color of the fertilizer, the water solubility is very good; if the solution is turbid or even precipitated, water soluble It is very poor, can not be used in the drip irrigation system, the waste of fertilizer will be more.
Smell the good water-soluble fertilizers are made from high-purity raw materials, without any taste or a very light fragrance. Fertilizers with odors are either hormones or too many harmful substances. This fertilizer works quickly, but it does not have any benefit to the disease resistance and sustained yield and quality of the crop.
Make a comparison After the preliminary screening of the water-soluble fertilizer through the above simple methods, and then do the field comparison, determine the water-soluble fertilizer through the actual application effect. Good fertilizers don't work too fast, because nutrients have a process of absorption and transformation. Good water-soluble fertilizers can be seen in two or three times in terms of plant growth, crop quality, crop yield and disease resistance. The more the number of uses, the greater the difference.
How to identify the quality of water soluble fertilizer
Look at the formula water-soluble fertilizer is actually a formula fertilizer, according to different crops, different soils and different water quality to formulate different formulations to maximize the nutritional needs of crops, improve fertilizer utilization, reduce waste, so the formula is to identify the quality of water soluble fertilizer key.
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