试论湘北地区推广杂交稻作早稻栽培的可行性

On the Development of Early Hybrid Rice Production in North Hunan

杂交早稻自１９８５年在湘北逐年示范推广，已形成一定规模，但近几年来却出现了大幅度的滑坡，面积锐减。作者从技术、实践诸方面论证了杂交早稻在湘北推广的可行性与必然性。

Early hybrid rice was demontrated and popularized to a certain scale in North Hunan from 1985 to 1992. For instance, in Lingli County, situated in the lower reaches of Lishui River of the Northern Hunan, the grown area of early hybrid rice amounted to 5 933 hm 2 in 1991, accounting for 25% of the total early rice area, and the yield was more than 6.5 t/hm 2 with a yield increase of 800～1 000 kg/hm 2 compared with early conventional rice. However, the area planted to early hybrid rice has decreased greatly in the recent years. The causes of the decrease in the early hybrid rice area were analyzed and the feasibility and necessity of early hybrid rice development on a large scale in North Hunan were discussed on the basis of the natural conditions, cultural techniques and practical experiences. Futhermore, it is hold that the stagnation of early rice production in North Hunan could only be changed by increasing early hybrid rice area.