In a study on the effect of morphactin on castor, it was found that soaking seeds prior to germination in low concentrations of morphactin (1 and 5ppm) promoted stem growth, while soaking in higher concentrations (10, 20, 40 and 60 ppm) tended to inhibit stem growth. Application of the chemical at 60, 120 or 240 ppm at later stages viz... cotyledon to one leaf, five to seven leaf and 10-12 leaf stages resulted in stunted growth and epinasty of the main axis.
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