First, check the logo on the packaging.
1. Nutrient Content Identification: Look for labels like 15% nitrogen, phosphorus, potassium or 12% nitrogen, 18% phosphorus, and 15% potassium. These numbers indicate the minimum percentage of each nutrient. For example, if a product states "14% nitrogen," it means that the actual nitrogen content must not be less than 14%. The total nutrients should be at least 44%, as the nominal value may be 45% but could be lower in reality. If the test result shows only 43%, even though two nutrients are slightly below, this can cost nearly 100 yuan per ton. Always verify the actual content before purchasing.
2. Trace Elements: While trace elements like zinc, iron, or sulfur can support plant growth, they shouldn't be the main focus when buying fertilizer. Some manufacturers overstate their importance and inflate prices based on the number of trace elements listed. Instead, focus on the three primary nutrients—nitrogen, phosphorus, and potassium—and calculate the price accordingly. Be cautious if the label says “nitrogen + potassium + trace elements†(like sulfur), because this is essentially a two-nutrient fertilizer, and the trace elements don’t count as a third effective component.
3. Types of Nutrients: A three-nutrient fertilizer contains nitrogen, phosphorus, and potassium—these are the essential nutrients for crop growth. Fertilizers with just two of these elements are called two-nutrient fertilizers. Some sellers might sell two-nutrient products while labeling them as three-nutrient to make more profit. Long-term use of such products can lead to soil degradation and reduced crop yields. Multi-element fertilizers include other trace elements besides N, P, K, but many of these are either absent or added in negligible amounts, making them ineffective. This is often just a marketing trick, so don’t be misled.
Second, review the chemical fertilizer test report. Whether you're buying imported or domestic fertilizer, always ask for a lab test report. It's best to get it tested by an authorized geological inspection department.
1. Check the levels of nitrogen, phosphorus, and potassium individually. Higher water-soluble phosphorus is better, as it improves nutrient availability.
2. Confirm the total nutrient content (N + P + K). This gives a clear picture of the fertilizer’s overall quality.
3. Examine the particle strength and moisture content. Stronger particles and lower moisture are preferable. Compare this with the information on the outer packaging and pay attention to nutrient deviation—smaller deviations are better.
4. Check if the fertilizer contains chlorine. High chlorine levels can harm certain crops like vegetables, citrus, and sweet potatoes, reducing both yield and quality. Avoid using chlorine-containing fertilizers on sensitive crops.
Third, choose reputable fertilizer suppliers. When purchasing, try to go with well-known brands or products you’ve used before and have seen good results from. This helps ensure quality and reliability. Always do your research and don’t rush into a purchase without checking all the details.
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