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Mineral or chemical fertilizers

Mineral salts and other chemical compounds produced by industrial method, added to soil in order to supply nutrients and to supplement certain elements taken up by plants. They are intended for pre-sowing or top dressing.

Mineral or chemical fertilizers are divided into:

- nitrogen fertilizers - e.g. Norwegian saltpeter, soda nitrate, ammonium nitrate, nitro-chalk, urea; contain active nitroanion; the main semi-products used to produce nitrogen fertilizers are ammonia (NH3) and nitric acid (HNO3),

- phosphatic fertilizers - e.g. super-phosphate, super Thomas phosphate and Thomas phosphate; contain phosphorus available to plants. Phosphatic fertilizers are obtained from minerals such as apatite of magmatic origin and phosphate rocks of secondary, sedimentary origin.

- potassic fertilizers - salts of potassium, e.g. potassium sulphate, kainite; contain potassium available to plants. Potassic fertilizers are obtained from minerals containing potassium salts,

- mixed fertilizers - containing several elements essential for plants in available form, mixed with chalk, gypsum or with other substances, e.g. Nitrofoska (Polish trade name for a line of highly concentrated fertilizers), ammonium chloride.

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