Diagnosis of nitrogen nutrition of flue-cured tobacco with chlorophyll meter A Preliminary Study on Nitrogen Nutrition Diagnosis for Short-Season Cotton with a Chlorophyll Meter A review on chlorophyll meter application on nitrogen fertilizer recommendation Application of chlorophyll meter on N nutritional diagnosis for summer corn Chlorophyll diagnoses of N nutrition for different winter wheat cultivars on dryland Research of nitrogen nutrition status for winter wheat based on chlorophyll meter