Abstract
Effects of Fe-EDDHA (Sequestrene 138), Fe-polyflavonoid (Rayplex), and an experimental iron lignosulfonate on dry matter yields, Fe content, and plant chlorosis of grain sorghum were studied under controlled conditions, using a normal and an Fe-deficient soil (DTPA extract). Application rates of 20, 40, and 80 ppm Fe were employed. Dry matter yields increased due to Fe applications. The lignosulfonate (Fe-LS) produced maximum dry matter yields followed by Fe-EDDHA and the polyflavonoid (Fe-PF) material. At the 80 ppm rate Fe-EDDHA and Fe-PF produced moderate and slight toxic effects, respectively. No toxic effect was noted with the Fe-LS material. Fe-EDDHA was found to be the most effective for correcting iron chlorosis, while the other two sources were similar in this respect. Except for the Fe-LS applied to the normal soil, all other treatments increased Fe content of plant shoots. In the Fe-deficient soil, Fe application lowered the Ca, Mg, Zn, and Mn concentrations in the plants. In the case of the normal soil, concentrations of these elements increased at the 20 ppm rate and underwent no further changes with higher rates. Treatments did not influence K and P concentrations of plants.
Additional index words: Micronutrients, Iron compounds.
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Salardini, A.A., Murphy, L.S. Grain sorghum (Sorghum bicolor Pers.) responses to organic iron on calcareous soils. Plant Soil 49, 57–70 (1978). https://doi.org/10.1007/BF02149908
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DOI: https://doi.org/10.1007/BF02149908