Effects of Growth-Regulating Substances on Propagation of Goldenrod

Abstract

Stolons 1. Stolon cuttings of goldenrod soaked in aqueous solutions of several growth substances at concentrations of 10 to 100 p.p.m. for 18 hours were inhibited in top growth. Some of the cuttings rotted following this long treatment. Soaking for 3 hours in indolebutyric-acid solution at 10 or 50 p.p.m. gave some increase in rooting over the controls. 2. Cuttings dusted with indolebutyric, naphthaleneacetic, naphthoxyacetic acids, or naphthalene acetamide, or a mixture of these four, dispersed in powdered talc produced more roots than did those without treatment, except when the highest concentrations were used. 3. When the temperature of the substrate was 70⚬-80⚬ F., the greatest number and quantity of roots were formed. 4. Regardless of treatment, stolons cut into 3-inch pieces produced many roots and heavy top growth. Those cut into 1/2-inch pieces produced few roots and only 50% of the pieces rooted; top growth was slight. Stems 5. Cuttings from young stems produced a more vigorous root and top syst...