At first glance, the main element crops require many elements, the most important ones are nitrogen, phosphorus and potassium, which are called main elements; calcium, magnesium and sulfur are less needed, called medium elements; copper, iron, zinc, molybdenum, etc. Very small, but indispensable, called trace elements. According to the state regulations, compound fertilizers only detect nitrogen, phosphorus and potassium, and the total nutrient content is represented by these three elements.
Second, look at the nutrient content of single nutrient content refers to the nitrogen, phosphorus, potassium each. If it is wrong to label only one total nutrient, it is impossible to reach the requirement of balanced fertilization because it does not know its ratio of nutrient distribution.
Third, look at the positive and negative nutrients, such as the following standard, the total nutrient is 45% ± 3%, the problem appears in ± 3%, manufacturers often give you 3 nutrients, in fact, less than 45%, then it depends The size of the positive and negative (±) difference is as small as possible. This is also the case with positive nutrient positive and negative differences. The reason is the same.
Fourth, look at the nutrient unit price to buy fertilizer can not just look at the price, but also count a nutrient unit price, that is, the price of a bag of fertilizer divided by the total nutrient scores of nitrogen, phosphorus, potassium, the value of the value can be seen, the smaller the value, the more cost-effective. For example: a bag of 45 nutrients of fertilizer sold 75 yuan, a nutrient of 1.67 yuan, and a bag of 25 nutrient content of fertilizer sold 50 yuan, a nutrient 2.0 yuan, which fertilizer is fairly clear. Excerpt from: Hebei Farmers Daily
Second, look at the nutrient content of single nutrient content refers to the nitrogen, phosphorus, potassium each. If it is wrong to label only one total nutrient, it is impossible to reach the requirement of balanced fertilization because it does not know its ratio of nutrient distribution.
Third, look at the positive and negative nutrients, such as the following standard, the total nutrient is 45% ± 3%, the problem appears in ± 3%, manufacturers often give you 3 nutrients, in fact, less than 45%, then it depends The size of the positive and negative (±) difference is as small as possible. This is also the case with positive nutrient positive and negative differences. The reason is the same.
Fourth, look at the nutrient unit price to buy fertilizer can not just look at the price, but also count a nutrient unit price, that is, the price of a bag of fertilizer divided by the total nutrient scores of nitrogen, phosphorus, potassium, the value of the value can be seen, the smaller the value, the more cost-effective. For example: a bag of 45 nutrients of fertilizer sold 75 yuan, a nutrient of 1.67 yuan, and a bag of 25 nutrient content of fertilizer sold 50 yuan, a nutrient 2.0 yuan, which fertilizer is fairly clear. Excerpt from: Hebei Farmers Daily
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