Studies on the Effect of Cytokinin on Growth of African Marigold (tagetes Erecta L.) Cv. Pusa Narangi Gainda

The experiment was carried out in two consecutive years 2016 and 2017 at Uttar BangaKrishiViswavidyalaya, CoochBehar, West Bengal to Studies on the effect of cytokinin on growth of African Marigold (Tagetes erectaL.)cv.PusaNarangiGainda.I was taken twelve different dose such as 25ppm, 50ppm,75ppm, 100ppm, 125ppm, 150ppm, 175ppm, 200ppm, 225ppm, 250ppm, 275ppm, 300ppm and one control.The experiment was conducted following RBD with 12 different levels of cytokinin ranging from 25 ppm, 50 ppm, 75 ppm, 100 ppm, 125 ppm.150 ppm, 175 ppm, 200 ppm, 225 ppm, 250 ppm, 275 ppm and 300 ppm and compared to control (distilled water spray).The 13 treatments were replicated thrice.Results revealed that application of 25 ppm BA increased the plant height at 21 days after transplanting (23.19 cm), plant height at 42 days after transplanting (48.13cm), leaflet length at 21 days after transplanting (4.32 cm), Leaflet length at 42 days after transplanting (6.80 cm), Increase in the girth of stem at 42 days after transplanting was noticed with 275 ppm BA application (9.36 mm).Initially, side-shoot production was increased with 200 ppm BA application (4.80 cm) but at 42 days after transplanting higher number of side-shoots was obtained with 150 ppm BA application (10.80 cm).Shoot length was found maximum with 175 BA application both at 21 days (2.88 cm) and 42 days after transplanting (14.0 cm).Leaf production was found maximum with 250 ppm BA application in both at 21 days (3.80) and 42 days (13.07) after transplanting.The same treatment also showed higher leaf length at 42 days after transplanting (21.86 cm).Though at 21 days leaflet production was higher with 225 ppm BA application (16.07) but at 42 days after transplanting 300 ppm BA application showed higher leaflet production (24.07).Initially 200 ppm BA application improved leaflet length (4.93 cm) but finally maximum leaflet length was found with 25 ppm BA application.Leaf expansion was observed higher with foliar application of 200 ppm BA in both at 21 days (0.96 cm) and 42 days after transplanting (1.33 cm).Plants treated with same concentration reached the flower bud initiation stage earliest (46.60 days after transplanting).Whereas, 200 ppm solution showed least time period (6.66 days) for flower bud development and from the developing bud to full bloom stage, 25 ppm BA concentration showed the earliness (6.60 days).