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Compound NPK fertilizers contain chemically bound ingredients, while blended NPK fertilizers are physical mixtures of single nutrient components. NPK rating is a rating system describing the amount of nitrogen, phosphorus, and potassium in a fertilizer.
Fertilizers with additional macronutrients (S, Ca, Mg) may add more numbers to the N-P-K ratio to indicate the amount. The additional numbers are similarly reported in the oxide mass fraction form. For example, a Polish fertilizer labeled "NPK (Ca,S) 4-12-12 (14-29)" has an equivalent of 14% soluble calcium oxide and 29% total sulfur trioxide. [6]
Urea phosphate is a 1:1 combination of urea and phosphoric acid that is used as a fertilizer. It has an NPK formula of 17-44-0, [1] and is soluble in water, producing a strongly acidic solution. Urea phosphate is available in fertilizer vendor bags that carry a UP signet on the packaging.
The chemical symbols for nitrogen (N), phosphorus (P), and potassium (K) give 10-10-10 fertilizer its other common name: NPK fertilizer. Liquid vs. Granular 10-10-10 Fertilizer groveb - Getty Images
Ammonium nitrate is an important fertilizer with NPK rating 34-0-0 (34% nitrogen). [17] It is less concentrated than urea (46-0-0), giving ammonium nitrate a slight transportation disadvantage. Ammonium nitrate's advantage over urea is that it is more stable and does not rapidly lose nitrogen to the atmosphere.
It also acts as a natural fertilizer with pesticidal properties. Neem cake is widely used in India to fertilize paddy , cotton and sugarcane. Usage of neem cake have shown an increase in the dry matter in Tectona grandis ( teak ), Acacia nilotica ( gum arabic ), and other forest trees.
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