摘要
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℃。
During 1987～1988,two hybrid rices-Shanyou 63 and Gangai 63 were planted as middle rice on the same altitude of 250～450m in Yubeiqu District of Chongqing,The ratoon rices grew at different natural temperatures. The results showed: the mean daily temperature decreased gradually with the altitude increasing progressively in the ratooning reason. The correlations between mean daily temperature and the 1000-grain-weight and growth duration of ratooning rice were significantly negative. Mean daily temperature showed significant correlation with agronomic characters such as the number of ratooning seedling,valid panicle,plant height,panicle length, grains per panicle,plump grains per panicle,seed setting rate ,and output per square;The correlations between mean daily temperature in the period of ratooning seedling and heading or florescence, and grain yield per ha were also significantly positive .It was concluded that the superior limit is about 340m altitude for planting ratooning rice to obtain stable higher yield in Chongqing by using the varieties of middle-late hybrid rice, the corresponding mean yearly temperature is 17.8℃,and the mean daily temperature between the first day with the temperature of 10℃ and the final day with the temperature of ≥22℃ continued for 5 days is 22.8℃.
出处
《中国农业气象》
CSCD
2002年第1期4-8,共5页
Chinese Journal of Agrometeorology
