Fertilizers

thumb|upright=1.35|A farmer spreading [[manure to improve soil fertility]]

Urea, also called carbamide (because it is a diamide of carbonic acid), is an organic compound with chemical formula . This amide has two amino groups (−) joined by a carbonyl functional group (−C(=O)−). It is thus the simplest amide of carbamic acid.

the ability of a soil to sustain agricultural plant growth

thumb|Polycrystalline potash, with a penny (United States coin)|U.S. penny for reference. (The coin is in diameter and copper in color.)

thumb|upright|Fertigation using white poly bag thumb|upright|Fertilizer mixed with water connected to a drip irrigation system Fertigation is the injection of fertilizers, used for soil amendments, water amendments and other water-soluble products into an irrigation system.

relative content of the chemical elements nitrogen, phosphorus, and potassium in fertilizer

Agrobiology is defined by Merriam-Webster as a field that studies how plant or crop nutrition, growth, and yield or production relate to soil management (Merriam-Webster). Agrobiology is an interdisciplinary field of study that provides a comprehensive understanding of the complex relationships between crops, soils, and the environment. Agrobiology consists of several science-based disciplines including, plant biology and nutrition, agronomy, ecology, genetics, molecular biology, and soil science. Prominent topics that involve agrobiology practices include the following but are not limited to,

contamination of water by excessive inputs of nutrients

plant feeding technique

A bioeffector is a viable microorganism or active natural compound which directly or indirectly affects plant performance (biofertilizer), and thus has the potential to reduce fertilizer and pesticide use in crop production.

Aka cyanamide process: nitrogen fixation reaction of calcium carbide with nitrogen gas

UAN is a solution of urea and ammonium nitrate in water used as a fertilizer. The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N) known as UN32 or UN-32, which consists of 45% ammonium nitrate, 35% urea and only 20% water. Other grades are UAN 28, UAN 30 and UAN 18. The solutions are quite corrosive towards mild steel (up to per year on C1010 steel) and are therefore generally equipped with a corrosion inhi

aspect of history

chemical compound

Isobutylidenediurea (abbreviated IBDU) is an organic compound with the formula (CH3)2CHCH{NHC(O)NH2}2. It is a derivative of urea (OC(NH2)2), which itself is highly soluble in water, but IBDU is not. It functions as a controlled-release fertiliser owing to its low solubility, which limits the rate of its hydrolysis to urea, which is a fast-acting fertiliser.

organization

type of injection fertilization

fertiliser that releases nutrients gradually

Nitrogenous compounds found in living systems

chemical compound

chemical compound