Effect of plant growth regulators on vegetative growth, flowering and corm production of gladiolus in Arunachal Pradesh

A field experiment was conducted during 2007–2008 at ICAR RC NEH Region, AP Centre, Basar, Arunachal Pradesh to identify the effect of plant growth regulators on growth, ffowerrng and corm production of gladiolus cv. Snow Princess. Sixteen treatments with five different plant growth regulators viz. GA₃, NAA, BA, Kinetin and CCC at three concentrations, including control was laid out. It was found that days to 50 percent plants to sprout varied from 9.6 days (T₂) to 38.3 days (T₁₆). Number of shoots per corm was more (2.4) with T9 followed by T₃. Plant height was more with T3 (89.8 cm) while number of leaves per plant was more (8.2) with T5. GA₃ 500 ppm recorded early flowering (75.9 days) followed by GA₃ 750 ppm (79.3 days) and NAA 250 ppm (80.1 days). Number of florets per spike, spike length and rachis length were more with T₁₄. Floret diameter was more with T₂ (13.9) while it was less with T₉. Durability of the spike was more with T₂ and T₃ while control wilted much earlier.