1) Ammonium sulfate Ammonium sulfate fertilizer has 21% nitrogen and 23% sulfur. This acid-forming fertilizer is suitable for calcareous soils and is relatively expensive and slightly resistant to washing.

2) Urea fertilizer: contains 46% nitrogen. This fertilizer is not acid-forming and is suitable for most soils. It is the cheapest and most common Iranian nitrogen fertilizer.

3) Ammonium nitrate fertilizer: contains 26% nitrogen. This fertilizer is not acid-forming and is suitable for sugar beet and is relatively expensive and sensitive to washing.

4) Ammonium phosphate fertilizer: 17% nitrogen and 26% phosphoric acid. Ammonium phosphate fertilizer is relatively acid-forming and dual-purpose and has a reasonable price and is slightly resistant to washing.

5) Urea form fertilizer: contains 26% nitrogen. This fertilizer is relatively acidic and suitable for grass, it is expensive and very resistant to washing.

6) Urea fertilizer: with sulfur coating: 35% nitrogen. It is acidic and suitable for light and wash-resistant soils, and its price is reasonable.

Of the advantages of chemical fertilizers, cheap price, simple and easy application, short-term false income (regardless of the depreciation of the main capital i.e. soil and its organic matter). The spread of many diseases and pests, for example, the spread of pear fire in the pear orchards of Karaj and Qazvin, nematodes in tea fields and even citrus canker in the south of the country, are mainly the result of unbalanced use of fertilizers.

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