k2so4 molar mass: 174.259 g/mol
Solubility in water:
111 g/L (20 °C)
120 g/L (25 °C)
240 g/L (100 °C)
Potassium sulfate or potassium sulphate, also called sulphate of potash (SOP), is the inorganic compound with the chemical formula K2SO4, a white water-soluble granular or powder. It contains 45% potassium and 18% sulfur. SOP fertilizer is commonly used in fertilizers, providing both potassium and sulfur.
SOP fertilizer is a water-soluble fertilizer with 51% K2O, which is a high quality potash fertilizer. In addition to potassium, potassium sulfate also provides plant-available sulfur. Using SOP fertilizer both improves quality and crop yields and makes plants more resilient to drought, frost, insects and even disease. SOP fertilizer has been known to improve the look and taste of foods and can improve a plant’s ability to absorb essential nutrients like phosphorus and iron.
Most often SOP fertilizer is used on high-value crops like fruits, vegetables, nuts, tea, coffee and tobacco. It works better on crops that are sensitive to chloride, which can be toxic to some fruit and vegetable plants. Furthermore, SOP fertilizer has a lower salt index than most potash fertilizers, making it the preferred choice when soil salinity is a concern.
The sulfate ions in SOP fertilizers, on the other hand, are not absorbed by plants and therefore become enriched in the soil. The roots of plants release H+ during growth, which, together with the combination of sulfate and weak base cations, often leads to a decrease in soil pH, often referred to as soil acidification. Once the soil is acidified, the survival of plants is difficult, and in the case of a lesser degree of acidification, plants will show various adverse reactions.Another SOP fertilizers hazard is of that the reaction between sulfate and calcium ions in the soil leads to salinization and slabbing of the soil, and the destruction of the soil structure directly leads to restricting the uptake of calcium elements, and the phenomenon of calcium deficiency in crops can occur.
SOP fertilizers is suitable for a wide range of crops, especially for tobacco, sugar cane, potatoes, sweet potatoes, grapes, tea trees and other crops that like potassium and avoid chlorine and cruciferous crops that like sulfur (e.g. rape, beans, etc.)
1. SOP fertilizers can be used as a base fertilizer. When using potassium sulfate as a base fertilizer in dry fields, it must be applied deeply to cover the soil to reduce the fixation of potassium crystals and facilitate the absorption of crop roots to improve the utilization rate.
2. Used as chasing fertilizer. As potassium is less mobile in the soil, it should be applied in strips or cavities to the more densely rooted soil layer to promote absorption.
3. SOP fertilizers can be used as seed fertilizer and extra-root chasing fertilizer. The amount of seed fertilizer is 1.5~2.5kg per mu, and it can also be prepared into 2%~3% solution for extra-root fertilizer.