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为解决临界温度双低两用核不育水稻 96 5 2S繁殖困难的问题 ,利用地下水对其进行了冷水灌溉繁殖试验 .结果表明 ,用不同温度的冷水从其雌雄蕊形成期 (Ⅳ )至花粉内容物充实期 (Ⅶ )连续灌溉 1 5d ,水深保持在 1 8～ 2 2cm ,其结实率与产量随灌溉水温升高而降低 .当平均灌溉水温为 1 8.5～ 1 9.8℃时 ,结实率可达 40 .5 %～ 57.6 % ,产量可达 3 .30～ 4 .35t·hm- 2 ;当平均灌溉水温为 2 0 .5～ 2 1 .3℃时 ,结实率与产量锐减 ,分别为 2 .5 %～ 1 0 .4%与 0 .2 1～ 0 .90t·hm- 2 ;当平均灌溉水温为 2 2 .3～ 2 3 .5℃时 ,结实率与产量均为 0 .当灌溉水温 (平均为 1 9.8℃ )与灌溉时期 (Ⅳ～Ⅶ期 )相同时 ,昼夜深灌 (1 8～ 2 2cm)处理的结实率与产量极显著高于其昼夜浅灌 (7～ 1 0cm)处理 .当灌溉水温 (平均为 1 9.8℃ )与灌溉水深 (1 8～ 2 2cm)相同时 ,灌溉时间长 (Ⅱ、Ⅲ～Ⅶ期 ,2 0～ 2 5d)、短 (Ⅳ～Ⅶ期 ,1 5d)处理的结实率与产量无明显差异 .用地下冷水灌溉可以繁殖临界温度双低两用核不育水稻 96 5 2S ,主要技术指标是灌溉水温 1 8～ 2 0℃ ,灌溉时期为Ⅳ～Ⅶ期 ,灌溉水深为 1 8～ 2 2cm .
In order to solve the difficult breeding problem of 96 5 2S dual-purpose nuclear sterile rice with critical temperature, groundwater was used to carry out cold water irrigation experiment.The results showed that cold water with different temperature was suitable for pollen During the filling period (Ⅶ), water was continuously sprayed for 15 days and water depth was 18 ~ 22 cm, the seed setting rate and yield decreased with the increase of irrigation water temperature.When the average irrigation water temperature was 1 8.5 ~ 1 9.8 ℃, the seed setting rate Up to 40.5% ~ 57.6%, and the yield can reach 3.30 ~ 4.35 t · hm-2. When the average irrigation water temperature is 20.5 ~ 21.3 ℃, the seed setting rate and yield decrease sharply Which was 2.5% -1.0.4% and 0.21-0.90t · hm-2 respectively. When the average irrigation water temperature was 22.3 ~ 23.5 ℃, the seed setting rate and yield were both 0. When the irrigation water temperature (average 1 9.8 ℃) and irrigation period (Ⅳ ~ Ⅶ) were the same, the seed setting rate and yield of day-night deep irrigation (18 ~ 22 cm) were significantly higher than those of day- 0cm) .When irrigation water temperature (average 1 9.8 ℃) was the same as irrigation water depth (18 ~ 22cm), irrigation time was longer (Ⅱ, Ⅲ ~ Ⅶ, 20 ~ 25d) Period, 15d), there was no significant difference between the seed setting rate and the yield.Using underground cold water irrigation could propagate the critical temperature dual-purpose nuclear sterile rice 96 5 2S, the main technical indicators are irrigation water temperature 18 ~ 20 ℃, irrigation period Ⅳ ~ Ⅶ period, the irrigation water depth is 18 ~ 22cm.