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Abstract
In greenhouse experiments, applications of Fe and/or Zn in the form of ferrous sulphate and zinc sulphate induced increased chlorophyll ‘a’ and ‘b’ concentrations, indole‐3‐acetic acid, nitrate reductase activity, and dry matter yield of french bean (Phaseoius vulgaris L.) plants. Iron and Zn in combination were more effective in delaying the leaf senescence compared to controls. Chlorophyll destruction was more rapid at the post‐flowering stage in control plants which led to early senescence and reduced photosynthetic duration. A rapid decline in nitrate reductase activity and indole‐3‐acetic acid concentration in control plants after the 50‐day growth stage further induced senescence. Iron alone and in combination of Zn appeared to contribute to the inhibition of senescence in french bean plants.