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The N value in NPK labels represents actual percentage of nitrogen element by weight, so it does not need to be converted. So, for example, an 18−51−20 fertilizer contains by weight 18% elemental nitrogen, 0.436 × 51 = 22% elemental phosphorus, and; 0.83 × 20 = 17% elemental potassium.
Unit price information printed on supermarket shelf labels (price tickets) illustrates the quantity of product by a unit of measure (price per 100 g, price per 100 ml). Unit pricing was originally designed as a device to enable customers to make comparisons between grocery products of different sizes and brand, hence enabling informed purchase ...
Density [a] ( kg / L ) Abundance and total mass in Earth's crust [b] ( mg / kg ) Price [7] Year Source Notes USD/kg USD/L [c] 1: H: Hydrogen: 0.00008988: 1400 (3.878 × 10 19 kg) 1.39: 0.000 125: 2012: DOE Hydrogen [8] [d] 1: 2 H (D) Deuterium: 0.0001667 [10] 13 400: 2.23: 2020: CIL [11] [e] 2: He: Helium: 0.0001785: 0.008 (2.216 × ...
Auxiliary Boiler – The Ammonia and Urea plants are supplemented with an auxiliary boiler of 60 MT/h steam capacity at 75 kg/cm 2 pressure and 480 °C. Purge Gas Recovery Unit (PGRU) – The productivity of the Ammonia plant was increased by installing a PGRU in May 1984 of 4,800 Nm 3 /h capacity.
A maize crop yielding 6–9 tonnes of grain per hectare (2.5 acres) requires 31–50 kilograms (68–110 lb) of phosphate fertilizer to be applied; soybean crops require about half, 20–25 kg per hectare. [21] Yara International is the world's largest producer of nitrogen-based fertilizers. [22]
Organic nutrients increase the abundance of soil organisms by providing organic matter and micronutrients for organismal relationships such as fungal mycorrhiza, [47] (which aid plants in absorbing nutrients), and can drastically reduce external inputs of pesticides, energy and fertilizer, at the cost of decreased yield.
Specifically, highly alkaline soils (pH~8.2 or higher) have proven to increase urea hydrolysis. One study has shown complete hydrolysis of urea within two days of application on such soils. In acidic soils (pH 5.2) the urea took twice as long to hydrolyze. [7] Surface residues, such as thatch and plant stubble exhibit increased urease activity.
Urea is the most used fertilizer in the world, due to its high content of nitrogen, low cost and high reactivity towards water. [32] When exposed to ocean waters, urea is metabolized by phytoplankton via urease enzymes to produce ammonia .