Core Viewpoint - The quality inspection of potassium fertilizer products in Hainan Province revealed that out of 12 batches tested, 1 batch was found to be non-compliant with usage requirements, specifically regarding chloride ion and free acid content [2][3]. Group 1: Inspection Results - The inspection was conducted in the fourth quarter of 2025, following various national standards, including GB/T 20406-2017 and GB/T 20784-2018 [2]. - The non-compliant batch was identified as "惠之美水溶性硫酸钾," produced by 青上化工(惠州)有限公司, with issues related to chloride ion (Cl-) and free acid (H2SO4) content [4]. - No safety-related non-compliance was found in the inspected products [2]. Group 2: Impact of Non-compliance - Excess chloride ion in potassium sulfate can accumulate in soil, leading to soil compaction and reduced permeability, which negatively affects crop growth, particularly for chloride-sensitive crops like tobacco and citrus [3]. - High levels of free acid can acidify the soil, harming microbial life and nutrient availability, and may also damage crop roots and agricultural equipment [3]. Group 3: Compliant Products - Several potassium fertilizer products passed the quality inspection, including "红牛硫酸钾" and "肥料级氯化钾," meeting the required standards for potassium oxide (K2O) and sulfur (S) content [4][5]. - The compliant products were sourced from various agricultural supply stores across Hainan Province, indicating a range of options for farmers [4].
2025年海南省流通领域钾肥产品质量监督抽查结果公布