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Effect of indolbutyric acid on the air layer rooting of guava (Psidium guajava L.) in the Baralt County, Venezuela. Preliminary evaluation

Abstract:

The air layer represents an alternative for asexual propagation. The effect of indole butyric acid (IBA) on the air layer rooting in guava (Psidium guajava L.) in Baralt County, Zulia state, Venezuela was evaluated. Air layer were completed in semi-lignified branches in active growth, of guava variants with White and Red meso or endocarp. Substrate was phenolic foam+coconut coit fiber (1:1) and four concentrations of IBA (0, 2000, 4000 and 6000 mg·kg -1) were evaluated, by following a completely randomized design with factorial arrangement 2×4 and two and four replications. Eleven weeks after air layers were made, the percentage of live (LL), and rooting layers (RL) and with callus formation (CL), root number per layer (RNL) and length of longest root (LLR). An analysis of variance and mean comparison were accomplished. There was not significant effect for RL, RLN and LLR; however, had 20.83% of RL, the RLN was 0.96 of air layers and LLR was of 8.73 mm in average. The LL percentages were between 20.83 and 62.50% for 4000 mg·kg -1 of IBA and control, for CL between 0.00 and 25.00% for 6000 mg·kg -1 and control, respectively, with statistical differences (P<0.045) in both cases. It is conclude that in selected guava variants and concentration of IBA used did not promote adequately the air layers rooting.