Rapid In-Field Determination of Nitrogen in Onions Fresh root sap analysis with LAQUAtwin nitrate ion meter o?ers cost- e?ective, rapid and easy solution to determine nitrogen status in onion plants. The nitrate-nitrogen (NO 3 -N) concentrations in onion vary at di?erent growth stages. The acceptable root sap NO 3 -N concentration range for 0.5 to 1.5-inch onion bulbs is 350 to 500 ppm. Introduction Nitrogen is a nutrient taken up by plants in the form of ammonium and nitrate ions for their green leafy growth. When ammonium fertilizers are applied to plants, the ammonium is converted to nitrate by nitri?cation process. Also, organic matter broken down in soil is transformed into ammonium ?rst and then eventually into nitrate. These circumstances result in more nitrate in soils. Thus nitrog

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