Short farmer’s guide

2. The role of chemical fertilizers

Fertilizers represent the plants’ food and their role is to prevent the content of nutrients in soil from decreasing. In order to develop normally, plants need carbon, hydrogen, oxygen which they take from the air and water plus 13 essential mineral elements called nutrients or fertilizers which they normally take from the soil. Fertilizers replace the nutrients the plants absorb.
The 13 nutrients or fertilizers are:
• Nitrogen (N) primary fertilizer;
• Phosphorus (P) primary fertilizer;
• Potassium (K) primary fertilizer;
• Sulphur (S) secondary fertilizer;
• Calcium (Ca) secondary fertilizer;
• Magnesium (Mg) secondary fertilizer;
• Iron (Fe) microelements;
• Molybdenum (Mo) microelements;
• Zinc (Zn) microelements;
• Boron (B) microelements;
• Manganese (Mn) microelements;
• Cobalt (Co) microelements;
• Copper (Cu) microelements.
Lack or insufficiency of any of the above nutrients leads to a serious decrease of crops.

The most wanted fertilizers are:
• Nitrous fertilizers;
• Ammonium nitrate;
• Calcium ammonium nitrate;
• Urea;
• Ammonium sulphate;
• Phosphatic fertilizers;
• Triple super phosphate;
• Super phosphate;
• Complex fertilizers (NPK);
• NPK 20.20.0;
• NPK 27.13,5.0;
• NPK 20.10.10;
• NPK 15.15.15.