北京地区冬小麦穗分化时期出现日期的研究

Studies on the Dates of Various Phases of Spike Differentiation of Winter Wheat in Beijing Area

根据14年田间试验观测资料,分析了温度、日照时数与冬小麦穗分化出现日期的关系,研究了不同穗分化时期的模式及其对穗粒数和产量的影响。研究表明,春季稳定通过0℃的日期、返青到二棱末期日照时数之和及单棱期到二棱末期温度决定穗分化过程的长短;返青到二棱末期天数长,单棱期到二棱末期温度低,有利于穗分化过程的延长和增加粒数,这些结果可供小麦栽培管理参考。

14 years(1971 ?1984) data of field tests were analyzed to study the relationship between temperature and sunshine hours and the occurence of various phases of spike differentiation of winter wheat in beijing area, models for the various phases were established. and their effects on the number of grains per spike and yield were studied. The results indicated that the length of the duration of spike differentiation in winter wheat depends uon the date in spring when the daily temperature is steadily over 0 C .the sum of sunshine hours from turning green phase to late double ridge phase and the accumulated temperature from single ridge phase to late double ridge phase. The longer the duration of the former period, the lower the temperature of the latter period , the longer the duration of spike differentiation and, consequently, the larger the number of grains per spike. These findings might be helpful for the management of wheat crop cultivation.