GB/T 20937-2018 in English

Technical background and development of potassium magnesium sulfate fertilizer

Potassium magnesium sulfate fertilizer is a compound potassium fertilizer containing magnesium, sulfur and other medium elements extracted from salt lake brine or solid potassium and magnesium salt mines. Its molecular formula is K2SO4·(MgSO4)m·nH2O, where m=1~2; n=0~6.

Standard Update and Technical Improvement

• Free Water Index:Expanded from a single index in the original standard to a dual-dimensional control of internal inspection and spot check inspection by production enterprises.
• Heavy Metal Limit:Added ecological indicators such as arsenic, cadmium, lead, chromium, and mercury to ensure the safety of fertilizers.
• Analysis Method Optimization:Introduced automatic analyzer method (GB/T 22923) and flame emission spectrophotometry (GB/T 6549) to improve detection efficiency.

Advantages and Application Scenarios of Potassium Sulfate Magnesium Fertilizer

Potassium Sulfate Magnesium Fertilizer not only provides the potassium element required by crops, but is also rich in magnesium and sulfur, and is suitable for a variety of soil conditions. Its advantages include:

• Improved Soil Structure:Increases soil permeability and water retention.
• Promote plant growth:Magnesium is a key element in chlorophyll synthesis, while sulfur helps improve crop resistance.
• Environmentally friendly:Low chloride properties make it perform well in salinized soils.