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(一) 洞庭湖区位于湖南北部,与湖北的江汉平原接壤,地理位置居东经113°35′—111°35′,北纬28°—29°5′之间,是我国重点建设的商品粮基地之一。杂交水稻在洞庭湖区大面积推广的1977年和1978年,曾发展到占晚稻总面积的49％,但因多种原因,产量不够理想,杂种优势没有得到充分发挥,致使该地区杂交晚稻面积逐年下降,到1980年仅占晚稻面积的11％。为了探索洞庭湖区重上杂交稻的途径,我们于1981—1983年开展了杂交晚稻适应性考察与研究,摸索了高产稳产的栽培技术。实践的结果表明,洞庭湖区
(1) The Dongting Lake region is located in the northern part of Hunan Province and bordering on the Jianghan Plain in Hubei Province. Its geographical location is between 113 ° 35’-111 ° 35’E and 28 ° -29 ° 5 ’north latitude. It is one of the key commercial grain bases in China . In 1977 and 1978, hybrid rice was widely distributed in Dongting Lake area, which accounted for 49% of the total area of late rice. However, due to a variety of reasons, the yield was not ideal and the heterosis was not fully brought into full play. As a result, Dropped to only 11% of the area of late rice in 1980. In order to explore the ways to reintroduce hybrid rice in the Dongting Lake area, we carried out the adaptive investigation and research of hybrid late rice in 1981-1983 and explored the cultivation techniques of high yield and stable yield. Practice shows that the Dongting Lake area