Abstract:

In this paper, the water-soluble fluorine content in composite fertilizers sampled from Zhejiang Province was investigated and summarized. The correlation between its content and total nutrient, nitrogen, phosphorus and potassium content of compound fertilizer was analyzed. The results showed that the content of water-soluble fluorine in composite fertilizers varied greatly, ranging from 0.01% to 3.50% with an average of 0.43%, while the average content of fluorine in Jiaxing and Huzhou was very high, 1.07% and 0.89% respectively. In terms of nutrient concentration distribution, the highest proportion of high-concentration composite fertilizers with total nutrient content ≥45.0% was 78%, and the average content of water-soluble fluorine was also the highest, reaching 0.47%, the average content of water-soluble fluorine was the highest in the 15% nitrogen composite fertilizer and phosphorus, reaching 0.62% and 0.59% respectively. The average content of water-soluble fluorine was the highest in the composite fertilizer of more than 20% potassium, 0.63%.

Key words: composite fertilizer, water-soluble fluorine, content