Look at the outer packaging of the regular manufacturer's product packaging is more standardized, printed product name, trademark, national standard, production license number, general NPK ratio, total nutrient content, net weight, manufacturer, site and contact Telephone etc. The “S†marked on the bag is based on potassium sulfate as the source of potassium. No labelled or “Cl†is based on potassium chloride as the source of potassium. The purchase should be based on the planting crop. However, the quality of compound fertilizers produced by some non-regular manufacturers is poor, and the printed items are not complete nor standardized.
Look at the appearance of fertilizers The products produced by regular manufacturers are uniform, uniform in color, free from caking, and have good water-solubility. The compound fertilizer which generally uses ammonium carbonate as the nitrogen source dissolves faster than the urea nitrogen source, and the columnar extrusion granulation dissolves faster than the spherical one. Such as bagged compound fertilizer agglomeration, if it is based on urea as a nitrogen source, and the knot of the block is broken, the quality is no problem, will not affect the fertilizer effect after application, otherwise the fertilizer effect is not good.
Looking at fertilizer nutrient content There are many varieties of compound fertilizer on the market. The difference is in the nutrient content, and some are in the same proportion of nitrogen, phosphorus, and potassium in the nutrient content level. When buying fertilizer, it is unscientific to only look at the price, not to see the content, which is the lowest price to buy. A bag of cheap fertilizer is not necessarily a bargain, we must see the total nutrient content of the fertilizer to determine which fertilizer to buy.
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