Could Leaf SPAD Values (Chlorophyll index) Compliment Nitrogen, Phosphorus, Potassium, Calcium, Sulfur, Magnesium, and Iron Nutrient Status in Romaine Lettuce (Lactuca sativa)
Dharma Pitchay1, Grija Vijayan1, Robert Mikkelsen2 and Juan Carlos Diaz-Perez3, (1)Tennessee State University, (2)Internatonal Plant Nutrition Inst, (3)University of Georgia