How to scientifically select chemical fertilizers during spring ploughing is very important. Today I will share with you the scientific knowledge of chemical fertilizer selection.
First, look at the packaging.
The outer packaging is a woven bag, the inner packaging is a plastic bag, and the packaging bag is machine stitched. The seams should be neat and consistent. The state requires that the packaging bag should be marked with the trademark, fertilizer name, manufacturer, fertilizer composition (indicating nitrogen, phosphorus, potassium content and added trace element content), product net weight and standard code, and each batch of products shipped with a quality certificate . Superphosphate is available in bulk but also requires a factory certificate.
Secondly, appearance inspection.
Seeing Fertilizer granules have good gloss, bright colors are good, and dullness is bad.
2. Rub your hands. Put fat in the palm of your hand and twist it twice. Rubbing is not good, rubbing is bad. The harder the fertilizer, the better.
3. Water soluble. Put a small amount of nitrogen and potassium fertilizers into the water and stir for 5 minutes. It can be completely dissolved as superior, but not completely dissolved as inferior. Diammonium phosphate can be dissolved with water, but the dissolution time is longer.
4. Burning. High-quality nitrogen and phosphorus fertilizers can be burned with fire. The longer the melting time, the better the remaining impurities; the shorter the melting time, the more the remaining impurities are poor. Urea is burned with fire energy and emits white smoke when the temperature is high. Diammonium is burned with fire energy, the longer the melting time, the better. Compound fertilizers are burned with fire energy, and the longer the melting time, the better. Phosphate fertilizers are not burnt when they are burned, and the quality is relatively poor. Compound fertilizers cannot be burned with fire, and inferior fertilizers are it.
5. Potash fertilizer. There are white, red, pink, red potassium fertilizer is generally imported potassium fertilizer, the best quality, potassium fertilizer tasted with the tongue, the spicy taste is better, the spicy taste is worse. Compound fertilizer tastes spicy with the tongue, indicating that it contains potassium.
Third, you must leave a receipt and related tickets when purchasing fertilizer, so that you can claim for a certificate when something goes wrong.
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