Fig. 1. Changes in daily mean air temperature (A), growing degree days (B), daily rainfall (C) and daily radiation (D) in the altitude experiment sites where the extremely early-maturing type onion plants were grown.
Fig. 2. Seasonal changes in day length (A) and solar radiation (B) in the altitude experiment sites where the extremely early-maturing type onion plants were grown.
Fig. 3. Changes in plant height (A), neck diameter (B), leaf number (C) and total leaf area (D) of the extremely early-maturing type onion under different temperature regimes at different altitudes.
Fig. 4. Changes in top fresh weight (A) and top dry weight (B) of the extremely early-maturing type onion under different temperature regimes at different altitudes.
Fig. 5. Changes in bulb diameter, bulb weight, bulb dry weight and bulbing ratio of the extremely early-maturing type onion under different temperature regimes at different altitudes.
Fig. 6. Relationship between bulb weight (A) and bulb dry weight (B) of extremely early-maturing type onion with daily mean temperature during the bulb growth stage (March 16 to April 14).
Table 1. The growth characteristics of bulbs of the extremely early-maturing type onion harvested at 180 days after
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