论文部分内容阅读
我县地处粤北山区,春暖迟,冬寒早,全年无霜期290天,年平均气温18.7℃,全年总积温为6004℃,有效积温只有2704℃(≥12℃起计).早春育秧常受低温阴雨的威胁造成大量烂秧死苗,晚造9月下旬寒露风就入侵,又造成晚稻安全抽穗的威胁.因此,季节紧迫,产量低而不稳.但是,我们分析了我县的天气特点和杂交稻的种性特点,采取相应的栽培措
My county is located in northern Guangdong mountains, late spring, early winter cold frost-free period 290 days, the annual average temperature of 18.7 ℃, the annual total accumulated temperature of 6004 ℃, effective accumulated temperature of only 2704 ℃ (≥ 12 ℃ since.) Early spring seedlings Often threatened by low temperature and rainy days caused a large number of rotten seedlings died of late winter cold dew invasion in late September, but also caused the threat of late heading safe heading.Therefore, the season is tight, the output is low and unstable.However, we analyzed the county Weather characteristics and hybrid rice species characteristics, take appropriate measures to cultivate