Most crop plants acquire their nitrogen mainly in the form of

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Most crop plants take up nitrogen from the soil in the form of nitrate ions (NO3-), which is the most common and readily available form of nitrogen in the soil. Nitrate ions are produced by the nitrification process, which converts ammonium ions (NH4+) in the soil into nitrate ions. While some plants can also use ammonium ions, nitrate is the primary source of nitrogen for most crops.

Most Crop Plants Acquire Their Nitrogen Mainly in the Form