论文部分内容阅读
恰当地扩大复种指数,种植双季稻,是充分利用气侯资源,增加粮食产量的重要途径。江汉平原的年太阳辐谢量100-110千卡/平方厘米,年降水量900-1,300毫米,80％保证率≥10℃积温均在4,800℃以上,一般水热条件是能够满足双季稻需要的。但在春秋季节,这里却常成为冷空气长驱直下的通道。春季低温阴雨,影响早稻育秧和移栽发苗;秋季冷害更加成为发展双季稻的主要限制因子,因9月20日之前若出现连续三天低于20℃的日平均气温,且日最低温两天低于16℃,或者一天低于15℃,则障碍双晚开花、裂药、授粉,使空秕增加,产量受损。
Properly expanding the multiple cropping index and planting double cropping rice are important ways to make full use of climate resources and increase grain output. Jianghan Plain annual solar radiation amount of 100-110 kcal / cm2, the annual rainfall of 900-1,300 mm, 80% guarantee rate ≥ 10 ℃ accumulated temperature above 4,800 ℃, the general hydrothermal conditions are able to meet the needs of double cropping rice of. But in the Spring and Autumn seasons, it is often the place where cold air is going down the road. Cold and rainy spring will affect early rice transplanting and seedling transplanting. Autumn cold damage has become the main limiting factor for the development of double cropping rice. If the daily average temperature below 20 ℃ for three consecutive days before September 20 occurs and the daily minimum temperature Two days below 16 ℃, or a day below 15 ℃, the barrier flowering double night, split medicine, pollination, so that the increase of air plutonium, yield damage.