Consequence of umbel orders on flowering pattern, seed yield and seed quality parameters in onion cv.CO (On)5
S Sivasakthi, J Renugadevi
A field experiment was undertaken to study the effect of umbel orders on flowering pattern, seed yield and seed quality parameters in onion. In this present investigation, Individual plant produces 10-12 umbels/plant, the flower stalk of first order umbel emerged at 35 days after sowing (DAS) and it was extended over a period of 69 DAS for emergence of last order umbel. The flowering initiated in the first order umbel on 63 DAS and it reached 50% flowering on 66 DAS and completed on 69 DAS. Where as in last order umbel flowering started on 92 DAS and reached 50% on 94 DAS and completed on 97 DAS. The days for attainment of physiological maturity by the first and last order umbels were 112 and 137 respectively. The quantitative and qualitative parameters were reduced as the umbel order increased. The maximum values of quantitative characters viz., umbel diameter (5.3 cm), umbel fresh weight (3.81 g), umbel dry weight (2.07 g), total number of capsules (94.6), number of filled capsules (50.8), seed set (53.6%); and qualitative characters viz., germination (88%), speed of germination (21.6), root length (6.0 cm), shoot length (9.1 cm), dry matter production (16.5 mg seedling-10) and vigour index-I (1333) were recorded up to seventh order umbels. After that, drastic reductions were observed in both quantitative and qualitative parameters. Hence it could be recommended that up to seven umbels plant-1 to be retained for the harvest of more quantity of high quality seeds in onion.
S Sivasakthi, J Renugadevi. Consequence of umbel orders on flowering pattern, seed yield and seed quality parameters in onion cv.CO (On)5. International Journal of Ecology and Environmental Sciences. 2020; 2(4): 608-614.