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Last updated: November 2008 Summary: Nitrogen is a macronutrient that is essential to plant growth and function. Nitrogen is not only the nutrient in the most demand, but is often called the "limiting nutrient" when other macronutrients such as phosphorus, potassium and sulphur are at optimum levels. High levels of N in the soil can increase plant growth, while low N levels will result in reduced pasture growth (stunted plants with small cells and thick leaves). Used strategically, N can give an economic return from increased pasture eaten (dependent on milk returns and price of nitrogen). However, when N is converted to nitrate in the soil it becomes mobile and can have negative impacts on the environment if not managed correctly. View full Farmfact:
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