Chemical fertilizers:
The production of these types of fertilizers brought about a revolution in agriculture and the increase in the production of crops. Over time, the production of these fertilizers has increased, and since these fertilizers increase the yield, it should also be kept in mind that these fertilizers cause a lot of damage to the soil, living organisms, and the ecosystem. >
The chemical composition and purity percentage of different fertilizers containing the same element are very different. These differences have a very important effect on the consumption, spreading method, fertilization time and effectiveness of fertilizers. Therefore, sufficient knowledge of the types of chemical fertilizers is necessary before choosing or using them.
Chemical fertilizers are divided into two categories, some of which are high-use plant elements (macroelement) and some are low-use plant elements (microelement). They are divided.
High consumption elements (macro) include: nitrogen - phosphorus - potassium - magnesium - calcium
Low consumption elements (micro) include: iron - zinc - copper - Manganese - boron
Properties of nitrogen fertilizers
Nitrogen can be absorbed by plants in the form of nitrate, ammonium ion and urea. Ammonium nitrate has 33% nitrogen and both forms of nitrogen can be absorbed by plants. Because it has a negative charge, it is not absorbed by soil colloids and is subject to washing from the soil. But because it has a positive charge, it is absorbed by soil colloids. Urea is the most common nitrogen fertilizer in Iran. Urea is one of the organic compounds and can be absorbed by plants in this form. Urea solution is also used in foliar spraying of plants. Ammonium nitrate urea can be applied to the soil before planting the crop or as a solution after the plant has grown a little. Ammonium sulfate has 24% sulfur in addition to nitrogen. Ammonium hydrate, which is obtained by dissolving ammonia in water, is placed under layers of soil with special syringes before planting.
Calcium nitrate and potassium nitrate have a low percentage of nitrogen and are used less as a source of nitrogen fertilizer in the soil. . These fertilizers are often used in nutrient solutions as sources of calcium or potassium.
Which nitrogen fertilizer is recommended for consumption?
Choosing nitrogen fertilizer can depend on several parameters. One of these is the price of fertilizer. As we said, urea fertilizer is much cheaper than ammonium sulfate fertilizer. Fertilizer has 46% nitrogen and ammonium sulfate fertilizer has 21% nitrogen. Soil conditions can also be a determining factor for choosing fertilizer. If the soil is very alkaline and its pH is high, we will reduce the pH to some extent by using ammonium sulfate fertilizer.