Effects of Chelated and Nonchelated Cobalt and Copper on Yields and Microelement Composition of Bush Beans Grown on Calcareous Soil in a Glasshouse1
- A. Wallace and
- R. T. Mueller2
Several levels of chelated [EDTA (ethylene diaminetetraacetate)] and nonchelated Co and Cu were applied to bush beans (Phaseolus vulgaris L. var. ‘Improved Tendergreen’) grown in a glasshouse in calcareous Hacienda loam soil. Objectives of the study were to determine if chelated Co and Cu were more available in the calcareous soil than were inorganic sources, and if chelating agents contribute to toxicities at relatively high levels of Co and Cu. CoEDTA and CuEDTA applications caused higher levels of Co and Cu, respectively, in the plants than did inorganic sulfate sources. The applications of both metal chelates caused slight depressions in yields of dry matter at 50 ppm metal added and CoEDTA behaved similarly at 25 ppm Co. Each metal chelate was associated with a decreased Fe concentration in leaves at the highest application level. The Co in leaves was similar for applications of 50 ppm Co as CoSO4 and 2.5 ppm Co as CoEDTA. The Cu concentration in leaves was greater for an application of 5 ppm Cu as CuEDTA than for 25 or 50 ppm Cu as CuSO4.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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