通过分期播种试验,确定了河套灌区主要经济作物向日葵适宜播种时期，并根据对应气候资料，采用相关分析和回归分析方法，确定了向日葵适宜播种农业气象指标。结果表明，食用和油用两类向日葵品种播种越早，出苗期和生育期越长，积温也越高；食用向日葵适宜播种农业气象指标为气温稳定通过5℃初日，其适宜播种范围在4月6日～4月30日，油用向日葵适宜播种农业气象指标为气温稳定通过10℃初日，其适宜播期范围在4月19日～5月16日。

Pass to expect to sow seeds to experiment separately, make sure the river set to infuse main cash crop sunflower of area the best sow seeds period, and according to to should the weather data, adopt related analysis with return to return an analytical method, make sure sunflower feat sow seeds the agriculture weather index sign, build up sunflower feat dibble a period forecast.The result show,that sow seeds more early, the seedling expect and grow a period more long, accumulate also more high;The edible sunflower is feat to sow seeds the agriculture weather index sign to pass for the air temperature stability 5 ℃ first day, it is feat to sow seeds scope on April 6th ～ April 30th, the oil uses sunflower feat sow seeds the agriculture weather index sign to pass for the air temperature stability 10 ℃ first day, it is feat to sow period scope on April 19th ～ May 16th.