Q828
Bolting problem in onion occur when temperature goes below
A.
25°C
B.
20°C
C.
15°C
D.
10°C
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Bolting problems in onions occur when the temperature goes below 10°C.The term bolting in onion means pre-emergence of seed stalks before the time of their formation at the cast of bulb formation and development. Bolting is an undesirable character because it directly affects the bulb yield of onion.
Rabi onion starts to bolt at 20 - 25°C temperature. Early transplanting (August) and late (end of December-January) induce bolting in Kharif and Rabi onion, respectively. The restricted or poor vegetative growth also leads to bolting.
It can be controlled by adjusting the time of transplanting in such a way that the crop may expose to a moderate temperature at bulbing. The maturity of the Rabi crop coincides with high temperature compared to the Kharif crop.