双季杂交晚稻直播栽培的不利气候分析

Analysis of Unfavorable Climate Condition to Direct-seeding Culture of DoubleCropping Hybrid Late Rice

从农业气候角度对双季杂交晚稻直播栽培的不利气候进行分析,认为在洪湖市乃至江汉平原的北亚热带季风气候条件下,双季杂交晚稻采用直播栽培,不仅浪费了常规育秧方式从秧田播种到移栽期近1个月的温光资源,而且在早稻收割整田后再直播,会使其安全齐穗期推迟,遭遇"寒露风"危害的风险明显增大,从而引起空壳率明显提高,减产风险很大,不适宜在江汉平原地区大面积推广。

The direct-seeding culture of rice was beneficial to saving labor and lowering cost.However,at honghu,even Jianghan Plain,which belongs to northern subtropical monsoon climate zone,extending the direct-seeding culture of hybrid late rice should be treated carefully.The unfavorable climate conditions to direct-seeding culture of double-cropping hybrid late rice were analyzed from the aspect of agroclimate in this paper.The direct-seeding culture of hybrid late rice wasted a month of temperature and light resource from sowing to transplanting.Moreover,this technology would put off the full heading time,thus leading to the high risk of encountering the cold dews wind weather and increaseing the percentage of unfilled grains.These results indicated that the direct-seeding culture should not be suggested in planting double-cropping hybrid late rice in Jianghan plain.