First, check the logo on the packaging.
1. Nutrient Content Identification: Look for labels such as 15% nitrogen, phosphorus, and potassium, or 12% nitrogen, 18% phosphorus, and 15% potassium. Each individual nutrient should not be less than 14%, and the total of all three nutrients should add up to at least 44%. However, if the label says "45% total nutrients," but a lab test shows only 43%, this discrepancy could cost you nearly 100 yuan per ton in lost value. Always verify the actual nutrient content before making a purchase.
2. Trace Elements: While trace elements like zinc, iron, or sulfur can support plant growth, they are not the main drivers of crop development. Some manufacturers exaggerate their importance and include multiple trace elements to justify higher prices. When buying fertilizer, don't focus on the number of trace elements listed. Instead, calculate the price based on the levels of nitrogen, phosphorus, and potassium. Be cautious—some products may list "nitrogen + potassium + trace elements" (like sulfur), which technically makes it a two-element fertilizer, not a three-nutrient one. Don’t let the inclusion of trace elements trick you into thinking it's more valuable.
3. Type of Nutrients: Three-element fertilizers contain nitrogen, phosphorus, and potassium—these are the three essential nutrients that plants need for healthy growth. Two-element fertilizers, on the other hand, only have two of these nutrients. Some sellers may mislead farmers by selling two-element fertilizers as three-element ones. This can lead to long-term soil degradation and poor crop yields. Additionally, multi-element fertilizers often include other trace elements, but in reality, many of them are either not present or added in insignificant amounts. These extra elements are usually just marketing tactics and offer little real benefit.
Second, review the chemical fertilizer test report.
Whether the fertilizer is imported or domestic, always ask for and check the official chemical test report. It’s best to get the report from an authorized geological inspection department.
1. Check the nitrogen, phosphorus, and potassium content. The higher the water-soluble phosphorus content, the better, as it ensures the nutrients are easily absorbed by the plants.
2. Verify the total nutrient content (nitrogen + phosphorus + potassium). A higher total nutrient percentage means a more concentrated fertilizer.
3. Examine the particle strength and moisture content. Stronger particles and lower moisture content indicate better quality. Compare these details with the information on the packaging, and pay attention to the nutrient deviation—smaller deviations are better.
4. Check if the fertilizer contains chlorine. Too much chlorine can harm certain crops like vegetables, citrus fruits, and sweet potatoes, leading to lower quality and reduced yields. Avoid using chlorine-containing fertilizers on sensitive crops.
Third, choose reputable fertilizer suppliers. When purchasing, try to buy from well-known brands or trusted retailers that have a proven track record. If you've used a particular fertilizer before and seen good results, it's safer to stick with it. Always do your research and avoid being swayed by flashy labels or high prices without real value.
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