Potassium sulphate, also called SOP fertilizer, arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline salt which is soluble in water, competitive prices. Potassium sulphate is commonly used in fertilizers, providing both potassium and sulfur.
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Chemical Name: Potassium Sulphate
Molecular Formula : K2SO4
Molecular Weight: 174.26
CAS: -80-5
Character: It occurs as colorless or white hard crystal or as crystalline powder. It tastes bitter and salty. Relative density is 2.662. 1g dissolves in about 8.5mL of water. It&#;s insoluble in ethanol and acetone. The pH of 5% aqueous solution is about 5.5 to 8.5.
Usage: It is used as seasoning and salt substitute.
Potassium sulphate is a kind of Potassium Fertilizer, also called SOP fertilizer, arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline salt which is soluble in water, competitive prices. Sanyuanjiuqi Potassium sulphate is commonly used in fertilizers, providing both potassium and sulfur.
1.Almost no chlorine, sodium and heavy metal.
2.Free liquidity, white crystal powder, soluble in water rapidly.
3.Aqueous solution show weakly acidic, can improve absorption of other cationic (especially trace elements).
4.Can meet the need of potassium of crops, lower salt-chemical index, applicable to all crops and all stages ,including flowering and maturity stages.
1.Used as potassium fertilizer in agriculture.
2.Mainly used as the raw material of BLENDING NPK.
3.Used as settling agent in glass industry.
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4.Used as intermediate in dyeing industry.
5.Used for producing potassium sale, potassium carbonate, potassium persulphate.
It should be stored in a dry and ventilative warehouse, kept away from heat and moisture during transportation, unloaded with care so as to avoid damage. Furthermore, it must be stored separately from poisonous substances.
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Dr. Alan Blaylock brings extensive North American and international experience in nutrient management to the agronomy team. University studies and service as a university extension soils specialist prepared him for a long career in the fertilizer industry. Having managed both domestic and global research and education programs, Dr. Blaylock has a wealth of experience in applying science-based nutrient management principles and products to solving practical questions. Dr. Blaylock earned Bachelor of Science and Master of Science degrees in agronomy and horticulture from Brigham Young University and a Ph.D. in soil science from Iowa State University. He has been in agriculture his entire life &#; from his childhood on an irrigated farm in eastern Oregon to teaching soil science at Iowa State University to his current role as an agronomist at Nutrien. These diverse experiences helped Dr. Blaylock develop the skills to excel in translating complex scientific principles into practical solutions. Although early in his university studies he explored computer science as a profession, deep family roots in agriculture brought him back to the people and values of his heritage. His career satisfaction comes from helping others improve the performance of nutrients and cropping systems. Dr. Alan Blaylock is a recipient of the Great Plains Soil Fertility Conference Leadership Award. The Fluid Fertilizer Foundation also recognized Dr. Alan Blaylock with the Werner Nelson Award for his outstanding contributions in the development of soil fertility practices and plant nutrition management to increase crop yields for the benefit of North American farmers and consumers
ClosePotassium (K) is an essential nutrient required by plants in large quantities. Potassium does not become part of the many complex organic molecules in the plant. It moves and performs many of its functions as a free ion, such as regulating plant water pressure, activating enzymes, balancing electrical charges, transporting sugars and starches, and more.1
Potassium fertilizers are mined from a variety of geologic potassium salt deposits around the world, some of the richest are in the Canadian province of Saskatchewan. The salts are processed to remove impurities and converted to a variety of fertilizers. Two of the most popular potassium fertilizers derived from these salt deposits are potassium chloride and potassium sulfate. The term &#;potash&#; is a general term that is often used to refer to a variety of potassium fertilizer salts or sometimes more specifically to potassium chloride, the most widely used potassium fertilizer. Potassium chloride is referred to as &#;muriate (meaning chloride) of potash&#; or MOP, while potassium sulfate is sometimes called &#;sulfate of potash&#; or SOP.2,3
The biggest differences between MOP and SOP are from the anion accompanying the potassium. Potassium chloride and potassium sulfate have advantages and disadvantages determined by the chemistry of these salts, their behavior in soils, and the nutrients supplied in addition to potassium. Both contain essential nutrients required by all crops. Potassium chloride supplies chloride, the ionic form of the element chlorine and an essential micronutrient. Potassium sulfate supplies plant-available sulfate-sulfur. Both MOP and SOP contain a high potassium percentage (60 or 62 percent as K2O for MOP and 50 percent K2O for SOP). The potassium in both fertilizers is in the same potassium form, and both salts are water soluble, though the water-solubility of potassium sulfate is about one-third that of potassium chloride.3 Potassium chloride could be dissolved in water for spray or fertigation applications while potassium sulfate would not be suitable for these applications.
The biggest disadvantage of potassium sulfate is cost. Potassium chloride is about 40 to 50 percent less expensive per pound of K2O than SOP. The biggest disadvantage of potassium chloride is its high salt index (116 for MOP 0-0-60 vs. 46 for SOP 0-0-50)4 and chloride content. Potassium sulfate is often preferred over potassium chloride for some chloride-sensitive crops such as potatoes, tobacco, some vegetables and fruits, some tree crops like almonds, walnuts and citrus, although these sensitivities are highly dependent on growing conditions, soil salinity, and salinity and chloride in irrigation water.5 Some studies show concerns for chloride may be warranted in some situations, but most studies show little if any difference in field performance of these two potassium sources provided sulfur or chloride is not deficient, and provided the total chloride from soil salinity or irrigation water is within the tolerance of the specific crop. For example, potato growers often use SOP as the potassium source because of concerns about chloride sensitivity, even though research indicates negative effects of chloride and an advantage of SOP over MOP are not common.6 Anecdotal reports of comparisons and grower experience are varied.
Chloride affects plants primarily through increasing osmotic potential of soil water. In other words, chloride salts increase the soil salinity which interferes with a plant&#;s ability to take up water. Even in chloride-sensitive crops, studies and observations indicate crops respond to the overall increased osmotic potential before chloride reaches toxic levels. To understand if chloride in the fertilizer is a specific concern, one must evaluate total salt loads, potassium rate, and growing conditions.
One can compare the osmotic effect of the two sources by calculating the soil-water salt concentration resulting from applications of MOP or SOP at a given potassium rate and multiplying by the osmotic coefficients for the respective salts. When applied to achieve the same potassium concentration in soil, the osmotic potential of MOP is about 1.3 times the osmotic potential for SOP, but the total salt contribution from either material at practical fertilization rates is still very small. The effect of 100 lbs of MOP per acre (60 pounds of K2O per acre) on the osmotic potential of the soil water is calculated as about 0.1 dS/m, a measure of salinity. To put this in perspective, the salinity threshold at which growth of almond &#; a sensitive crop &#; is not impaired is listed as 1.5 dS/m in the saturated soil extract (electrical conductivity of the extract, or ECe, the standard laboratory measure of soil salinity).7,8 The threshold ECe for strawberry, carrot, onion, and common bean, other sensitive crops, is 1.0 dS/m. The amount of chloride added with normal fertilizer rates would usually be well below the injurious chloride concentrations published for chloride-sensitive crops.9 Sensitive crops begin to show leaf injury at 0.1-0.3 percent chloride in the leaf tissue.9,10 Therefore, unless the total soluble salt and/or chloride load in the soil or irrigation water is near or above the threshold salinity tolerance for the intended crop, potassium source effects are unlikely to have any practical consequence. Note that low precipitation rates and deficit irrigation can exacerbate salt and chloride toxicity issues.9,10 If soil or irrigation water salinity is near or above tolerance thresholds, chloride and salt effects should be managed with potash application rate and timing, possible split applications, maintaining appropriate leaching fractions, and substituting some or all of the MOP with SOP.
Some factors that influence whether potassium chloride use presents a potential risk are:
While specific examples of MOP vs. SOP comparison studies in sensitive crops are not common in the recent published literature, one recent example for almond production in California is shown below.11 In this study over five years, only one case produced a significant advantage of SOP over MOP &#; with fan jet irrigation delivery.
Potassium Source 200 lbs K2O/acre Irrigation Year SOP+KTS SOP MOP Probability Fan jet NS NS a a b 0.016 NS 799 663 649 NS Drip NS NS NS NS 775 718 806 NSEmerging biostimulant technologies may also be available to mitigate salt effects or increase salt tolerance. Research with some of these materials is showing promise in mitigating or reducing salinity stress. The grower should study available third-party research and do on-farm tests with these products before large scale use. More research is needed, but some early returns from the research being done indicate these products could facilitate additional management options.
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