【摘要】 在哈尔滨地区自然条件下,采用5个分期播种处理对温度变化与甜菜出苗天数之间的关系进行了研究。结果表明:播种时间越早,甜菜出苗越早,随着播种期的推迟,出苗所需天数逐渐减少,在出苗率上,处理1>处理2>处理3>处理4>处理5,总体上播种时间早的处理出苗率好于播种时间晚的。随着播种期的推迟,日平均气温与出苗天数呈幂函数关系变化(y=251.1723x-1.3093),平均土壤温度与出苗天数呈指数关系变化(y=57.5499e-0.1624x’),方程拟合合适,此方程可根据平均气温和平均土壤温度,对甜菜出苗天数进行预测,为甜菜生产上播种期的选择提供指标依据,为甜菜的栽培提供理论依据。更多还原

【Abstract】 The relationship between temperature change and days of sugarbeet seedling emergence was studied by 5 different sowing date treatments under a natural condition in Harbin area. The results showed that: The earlier sowing date, the sooner seedling emergence of sugarbeet, and the days of sugarbeet seedling emergence were decreasing with delaying the sowing date. For seedling germination rate was as treatment1 >treatment2 > treatment3 >treatment4 >treatment5. The seedling germination rate of earlier sowing date was better than that of latter sowing date. With delaying the sowing date, the average daily temperature and days of sugarbeet seedling emergence presented power function equation(y =251.1723x-1.3093), the average soil temperature and days of sugarbeet seedling emergence presented exponential equation(y=57.5499e-0.1624x’). The equations could predict the days of seedling emergence with average daily temperature or soil temperature, and provide indicator basis for choosing suitable sowing date and for cultivation of sugarbeet.更多还原