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Fertilisers are substances that supply plant nutrients or correct soil fertility

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´╗┐Fertilisers are substances that supply plant nutrients or correct soil fertility. They are the best way of increasing crop production and of improving the quality of food. Fertilisers are used to supplement nutrients in the soil, especially to correct yield-limiting factors, such as weather, space and water. The main nutrients in fertilisers are nitrogen, phosphorus, and potassium (these are the macro- nutrients) and other nutrients (micro nutrients) are added in smaller amounts. Fertilisers are usually applied to soil, or can be sprayed on leaves. Fertilisers usually provide, in different proportions: 1. Three main macro nutrients: nitrogen (N), phosphorus (P), and potassium (K). ...read more.


into usable food for plants. A phosphorus deficiency will lead to stunted looking plants that produce a lower quality fruit or flower. Potassium, often called potash, helps plants use water and resist drought. It promotes healthy green plants. It is important to food crops and enhances the size of fruits and vegetables. The macro nutrients are taken in, in larger quantities and are present in plant tissue in amounts from 0.2% to 4.0% . Micro nutrients are consumed in smaller quantities and are present in plant tissue in quantities measured in parts per million (ppm), ranging from 5 to 200 ppm. ...read more.


Inorganic fertilisers are often synthesized using the Haber process, which produces ammonia as the end product. This ammonia is used as a food for other nitrogen fertilizers, such as anhydrous ammonium nitrate and urea. Ammonia nitrate is a common high nitrogen fertiliser. The acid-base reaction of ammonia with nitric acid gives a solution of ammonium nitrate. It is 34.5% nitrogen HNO3(aq) + NH3(g) ? NH4NO3(aq) ammonia + nitric acid? ammonium nitrate. Organic fertilisers are fertiliser compounds that contain one or more kinds of organic matter. The ingredients may be animal or vegetable matter or a combination of the two. Processed organic fertilisers include compost, blood meal, bone meal, humic acid, amino acids, and seaweed extracts and naturally-occurring organic fertilisers include manure, slurry, worm castings, peat, seaweed, humic acid, and guano. ...read more.

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