Vol. 8, Issue 2 (2019)

Author(s):
Gulab Singh, Gautam Saha, Krishna Deo and Banasmita Barman

Abstract:
Consumable Alliums are imperative vegetables around the world. In India, onion is overwhelmingly developed during rabi season while around 60% took after by 20% each developed in kharif and late kharif season (Tripathy et al., 2013). Varieties of diseases and pest attack especially arthropod to onions have the potentiality to diminish crop yield and quality (Lorbeer et al., 2002). The experiment was consisted with four different planting times of 14^th August, 21^st August, 28^th August, 4^th September for kharif season along with three spacing schedule (15 × 10cm, 20 × 15 cm and 15 × 15 cm) during both the seasons following randomized block design with three replications. Thrips counting were started from 30 DAT (Days after transplanting) and continued till physiological maturity of onion crop from selected five plants of each plot. Eco climatic variables were monitored simultaneously. Results revealed that treatment combination P4S2 (4^th September, 20cm×15cm) took maximum days (115-116 Days) to attain maturity in each year. Planting dates exerted immense effects on duration to attain different phenological phases of kharif onion as compare to spacing schedules. Treatment combination P₄S₂ (4^th September 2014, 20×15cm) took maximum days (115-116 Days) to attain maturity in each year. Tallest onion plants were observed for P₃S₂ (28^th August, 20×15cm). Whereas, the treatment differences were highly significant due to date of planting especially during 14-84 DAP. Very less treatment differences in plant height were analyzed for spacing scheduling. Number of leaves/plant was significantly affected by planting dates. Maximum number of leaves/plant (13.30) was recorded for P₃ (28^th August) at 84 DAP. Spacing had also some effect on number of leaves / plant where maximum leaves /plant were in S₂-20×15cm (11.83) at 84 DAP.