应用分期播种法分析乌贡一号感温特性

A STUDY ON SENSIBILITY TO TEMPERATURE OF "WU GONG NO. 1

试验研究表明，乌贡一号自播种至齐穗期及全生育期的长短，在本市栽培时随种植季节的不同而变化，且变幅较大，有效积温的变幅则较小，其高温出穗促进率达３０％左右，表现为感温性强的早熟中种稻。该品种分率期各叶片出生所需有效积温较少，约为５０～６０℃，幼穗分化期各叶出生所需有效积温较多，达１００℃以上。乌贡一号在本市从３月下旬至７月中旬播种均可正常成熟，随播期的推迟，其全生育期、所需积温、总叶龄均呈递减趋势；而经济性状也有一定差异，以６月１１日至６月２５日期间播种者经济性状发展较好，产量较高。本研究为该品种选择适宜推广地区、栽培季节等方面提供了依据。

The study was carried out on observation in the field and test in recent years,the results indicate that changes of dates from seeding to heading and all growth period are greater with variations of temperature on 'Wu Gong No. 1',those of total effective accumulated temperature are smaller and percent of heading was increased by 30% at high temperature. 'Wu Gong No. 1' is an early mature middle indica type rice with strong sensibility to temperature. Its leaf growth needs higher accumulated temperature in tillering period,but lower one in panicle differentiation stage. 'Wu Gong No. 1' matures normally from 15 Mar.to 15Jul. in Shanghai. But accumulated temperature and leaf age of all growth period show a tendency of decrease with delay of seeding date.