Forms of nitrogen, nitrate, ammonium ion and urea is readily absorbed by the plant. The main form of nitrogen in the soil and forms, and then come into more or less short. These forms have been converted to the release of soil pH on the decline. Nitrogen in the form of nitrogen fertilizers are listed. Ammonium nitrate 33% N and both N forms that are readily absorbed by the plant. Because the negatively charged soil colloids are not attracted to wash the soil. But it has a positive charge is attracted to soil colloids and gradually comes on. The most common nitrogen fertilizer urea in Iran. Urea is an organic compound and is therefore a form readily absorbed by the plant.  more ...
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