Abstract
Abstract Addition of L‐tryptophan (L‐TRP) to soil can have an ecological impact on the growth and development of some plants through its catabolism into auxins by rhizosphere microflora. A pot experiment was conducted to assess the influence of L‐TRP on growth and chemical composition of cotton (Gossypium hirsutum L.). Seven L‐TRP levels (10‐7 to 10‐1 g/kg soil) were applied as a soil drench in addition to a control. Data obtained revealed that specific growth parameters were significantly promoted, such as plant height (27.3%), dry weights of shoot (45.7%) and root (35.8%), biomass (43.3%), and number of branches (37.5%), flowers (63.3%) and bolls per plant (22.4%) in response to L‐TRP treatments. Similarly, the nitrogen (N), phosphorus (P), and potassium (K) concentrations in plant tissues and their uptake were also significantly affected by the exogenous application of L‐TRP. Significant linear or quadratic dose‐response relationships were found when root mass, branches, flowers, bolls, and NPK concent...
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