Salts, such as schoenite and kainite, are extracted from the earth’s surface and carefully rinsed with salt solution and clean water to eliminate the by-products and produce potassium sulfate (Christensen).Usually, K-Concentration is very low to support the growth of healthy plants. Therefore, potassium is needed to complete the essential plant functions, such as synthesizing proteins, activation of enzyme reactions, formation of starch and sugars as well as water regulation in leaves and cells. SOP is therefore a very good source of plant nutrition because the concentration of K in K2SO4 is the same as other potash fertilizers. Nevertheless, it is also a source of S, which is mostly a deficient mineral in plants. Sulfur is a necessity for enzyme actions and protein synthesis. On some occasions, some plants or soils do not need additional Cl- and should be avoided. Because of these cases, SOP provides an alternative source (K) because it is soluble as KCl. In cases where chloride ions are not supposed to be added to soil through common KCl fertilizers, SOP is used potassium sulfate is used as a fertilizer. It does not contain Cl- may pose harm to plants. In most cases, K2SO4 is preferred to vegetables, tobacco and fruits. However, less sensitive crops to chloride may need sulfate for healthy growth. On the other hand, the crude salt, which could otherwise be wasted, is used to make glasses (NSW Agriculture & all other plants, grapes require essential nutrients for maximum yield and growth. In most places, soils contain almost sufficient nutrients that support the growth of crops. However, some plants require more of some other nutrients than others for better yield. Even though soils contain nutrients such as boron, phosphorus, nitrogen, magnesium and potassium, they may not be enough to sustain health plants and produce maximum yield (NSW Agriculture & Grapes are such plants that require vineyard fertilizers (K2SO4) for optimal fruit production and healthy growth.Potassium sulfate is also very essential for successful fertilization as it determines accurate nutrient level in the vineyard. Vineyards may have varied nutrient levels available for the vines. Vines with slow growth, abnormal leaf color and poor or slow fruit development is an indication of low deficits of potassium
Christensen, L. Peter. Raisin Production Manual. London: UCANR Publications, 2000.
Federal Grapegrowers Council of Australia. "The Australian Grapegrower & Winemaker." Journal of the Australian Wine Industry (2001): 289-300.
NSW Agriculture & Fisheries, Mudgee Wine Grape Growers Association. Grapevine Management Guide. Cornell University: NSW Agriculture & Fisheries, 2005.
Price, G. H. Australian Soil Fertility Manual. Csiro Publishing, 2006.
UN Industrial Development Organization, International Fertilizer Development Center. Fertilizer Manual. NY: Springer Science & Business Media, 2008.
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