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198 7～ 1988年用杂交稻汕优 6 3和冈矮 6 3,在重庆市渝北区同一坡面海拔 2 5 0～ 4 5 0 m作中稻种植 ,使其再生稻在不同的自然温度下生长发育 ,结果表明 :再生季日均温随海拔高度递增而逐渐下降 ,它与再生稻全生育日数和千粒重均呈显著负相关 ,与再生苗数、有效穗数、株高、穗长、穗着粒数、穗实粒数、结实率等农艺性状以及单位面积产量均呈显著正相关 ;再生稻长苗期和抽穗开花期的日均温与再生稻单产亦呈显著正相关。据此提出重庆地区中迟熟杂交稻品种再生稻稳定较高产量的适宜种植区海拔高度上限约为 340 m,其对应的年均温为 17.8℃ ,稳定通过 10℃初日至连续 5 d≥ 2 2℃终日间的日均温为 2 2 .8℃。
198 7 to 1988 with hybrid rice Shanyou 6 3 and Gang short 6 3, Chongqing Yuzhong same slope surface elevation of 25 0 ~ 45 0 m for mid-season planting, so that its ratooning rice at different natural temperatures The results showed that the daily average temperature of the regeneration season decreased gradually with increasing altitude, which was negatively correlated with the total number of birth days and 1000-grain weight of regenerated rice. The results showed that the number of regenerated seedlings per plant, the number of effective panicles, plant height, Grains per plant, grains per spike, seed setting rate and yield per unit area were significantly and positively correlated. The average daily temperature of ratooning rice at seedling stage and flowering and flowering stage was also significantly and positively correlated with the yield of ratoon rice. It is suggested that the upper limit of altitude suitable for stable and high yield of middle-late maturing hybrid rice varieties in Chongqing is about 340 m, the corresponding average annual temperature is 17.8 ℃, Daily average daily temperature at 2 ℃ was 22.8 ℃.