Effect of length and diameter of cuttings and Indole Butyric Acid (IBA) hormone on vegetative reproduction of native species Tamarix androssowii

This experiment with the aim of optimizing the propagation of Tamarix androssowii was conducted in a completely randomized factorial design with cutting length (10-20, 20-30, 30-40 cm) as the first factor and cuttings diameter (0.5-1.0, 1-1.5, 1.5-2 cm) as the second fator in 15 replicates in February 2018. In order to investigate the role of IBA hormones on vegetative traits of T. androssowii, another experiment was conducted in a completely randomized factorial design with soaking time (one minute, five minutes) as the first factor and the concentration of solution (zero, 500, 1500, 3000 ppm) as the second factor in 10 replicates. The results showed that the maximum mean root length was 10.4 cm in the treatment of the cuttings length of 30-40 cm and the lowest was found in the treatment of the length of the cuttings 10-20 cm with an average of 6.7 cm. Also, the highest number of flowers with an average of 3.1 and the highest plant fresh weight with the amount of 42.3 g were recorded in the length of the cuttings 40-30 cm treatment. The analysis of variance showed that the highest number of roots, number of stems and the highest mean root length were related to the cuttings diameter of 0.5-1 cm treatment. By increasing the cutting diameter, the plant's fresh weight was also increased. The effect of soaking time in indole butyric acid solution was not significant on all traits except for the number of stems produced (p<0.05) . However, the indole butyric acid solution concentration had significant positive effect on the measured traits such as number of roots, number of stems, and ratio of number of stems to roots and fresh weight of the plant (p<0.05).