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Abstract
Interactions between several nutrient‐elements were studied in an extensive series of tomato, sweet corn and snapbean experiments, each at 9 production sites across Pennsylvania. Fertilizer treatments were NP and NPK applied as urea, triple superphosphate and muriate of potash, plus a check. Lime (calcitic or calcitic with 3% Mg) was applied at the recommended rate at each site. When NP treatment was compared to the check, leaf K was depressed, leaf Ca, Mg and Mn were enhanced, and yields were increased. When NPK was compared to NP, leaf K and Mn were enhanced, leaf Ca and Mg were depressed, and yields were increased, except with sweet corn. The increase in leaf Mg by NP was almost completely counteracted by addition of K. Leaf Mn was increased by NP and further enhanced by NPK, which prevented Mn deficiency at one site.
Notes
Authorized for publication as Paper No. 101 in the Department of Horticulture Series and as Paper No. 7458 in the Journal Series of the Pennsylvania Agricultural Experiment Station.
Professor of Plant Nutrition and Research Aide, respectively. Department of Horticulture The Pennsylvania State University, University Park, PA 16802.