Which of the following climatic factors mainly influences the curd initiation and development in cauliflower?

Correct option is A

In cauliflower (Brassica oleracea var. botrytis), temperature is the most critical climatic factor that governs both curd initiation and curd development.
Key Points:
· Temperature requirements:
· Different cauliflower varieties are categorized based on their temperature requirement for curding.
· Early varieties require relatively higher temperatures (20–25°C) for curd initiation.
· Mid and late varieties need cooler temperatures (10–16°C) for proper curd formation.
· If the temperature is too high or too low for the specific variety:
· No curd forms.
· The plant may bolt (produce flowers prematurely) or form loose, poor-quality curds.
· Management:
· Selecting the right variety according to the season and local climate is essential to match the curd initiation temperature.
Other Options Explained:
· (b) Photoperiod:
· While photoperiod influences some plants (like onions and spinach), cauliflower's curding is mainly temperature-dependent.
· (c) Relative humidity:
· Important for general plant health, but not the primary factor for curd initiation.
· (d) CO₂ concentration:
· Affects photosynthesis, but not directly linked to curd initiation or development.