Using Leaf Petiole Analysis to Monitor Cotton Nutrition

Abstract With the ever-increasing cost of soil amendments, cotton growers are forced to maximize the full potential of each nutrient applied to the soil. Monitoring nutrient levels within the cotton plant allows the grower to determine the precise amount of nitrogen, phosphorous, and potassium either being stored or actively used by the plant. Different rates of nitrogen and potassium were applied to cotton in a randomized block design. Nitrogen rates included 0, 40, 80, and 120 pounds per acre. Potassium rates included 0, 50, and 100 pounds per acre. The test called for 12 total treatments including a control, and to be replicated 6 times, with 3 replications being fully irrigated at 1 inch of water per week. Results are based on nutrient uptake and translocation through the leaf and petiole in relation to water, nutrient availability, and inter-nutrient dependency.