Abstract:

Based on the meteorological data of daily average temperature and daily average relative humidity in Xianyang from 1991 to 2020, and combined with the production data of ‘Biyu’ radish in field in Weicheng in southern Xianyang and Xunyi County in northern Xianyang in 2020, the agrometeorological indexes and suitable sowing time of ‘Biyu’ radish in field planting were studied, aiming to provide theoretical reference for the rational and efficient use of climate resources to develop the planting scale of cold climate vegetables in Xianyang. The results showed that (1) daily mean temperature and daily mean relative humidity were the main agrometeorological indexes affecting the vegetative growth stage of radish; (2) the optimal daily average temperature of radish was 11.1-24.9℃, and the optimal daily average relative humidity of radish was >47%. (3) in northern Xianyang, the optimum sowing time of radish in Changwu, Xunyi and Chunhua was from April 14 to August 5; the optimum sowing time in Binzhou and Yongshou was from April 4 to May 16 and from July 28 to August 12; (4) the optimum sowing time of radish in the southern counties (Weicheng, Sanyuan, Xingping, Ganxian, Wugong, Jingyang and Liquan) was mainly from March 17 to April 13 and from August 15 to 24. There was a significant correlation between the earliest sowing date of ‘Biyu’ radish in Xianyang and altitude (P<0.01), and the earliest sowing date of radish was delayed with the increase of altitude.

Key words: ‘Biyu’ radish, daily average temperature, daily average relative humidity, agrometeorological index, suitable sowing time