Using a split plot design, super high-yielding early rice "Zhongjiazao 17"and "Ganxin 203" and super high-yielding late rice "Ganxin 688" and "Wufengy-ouT025" were taken...Using a split plot design, super high-yielding early rice "Zhongjiazao 17"and "Ganxin 203" and super high-yielding late rice "Ganxin 688" and "Wufengy-ouT025" were taken as materials with planting density the same at 312 000 hil s/hm2, to explore the effects of RS/IS (Ratio of row spacing to intrarow row spacing) on yield, top three leaves morphological features and its relationship of them in 2011 and 2012. The results showed that, whether early or late rice, biomass, accumula-tion and apparent utilizing rate of nitrogen were lower in RS/IS5.0 (40.0 cm ×8.0 cm) treatment, but yield of rice was higher in RS/IS2.0 (25.0 cm ×12.8 cm) treatment;grain numbers per spike of rice was more in RS/IS2.8 (30.0 cm×10.7 cm) treatment, and thousand-grain weight of rice was higher in RS/IS1.3 (20.0 cm×16.0 cm) treat-ment. For 4 varieties of early or late rice aforementioned, basal angle, opening an-gle and leaf area of 2nd leaf from top were larger in RS/IS5.0 treatment, and basal angle and opening angle were smal er in RS/IS2.0 treatment and leaf area smal er in RS/IS1.3 treatment.展开更多
本研究旨在明确传统双季晚籼稻地区双季杂交晚粳稻超高产产量构成及其群体特征,阐明双季杂交晚粳稻超高产形成规律。以江西省上高县6.77 hm2连片双季杂交晚粳稻高产攻关示范方为依托,选用杂交粳稻甬优8号为材料,对中产(8.25~9.75 t hm...本研究旨在明确传统双季晚籼稻地区双季杂交晚粳稻超高产产量构成及其群体特征,阐明双季杂交晚粳稻超高产形成规律。以江西省上高县6.77 hm2连片双季杂交晚粳稻高产攻关示范方为依托,选用杂交粳稻甬优8号为材料,对中产(8.25~9.75 t hm–2)、高产(9.75~10.50 t hm–2)和超高产(>10.50 t hm–2)3个产量水平群体的产量构成及群体特征进行系统比较研究。结果表明,与中产、高产水平群体相比,超高产水平群体表现穗数足、穗型大、群体颖花量多(50 000×104 hm-2以上)的显著特点,但结实率和千粒重略低,差异不显著;群体茎蘖动态上,群体起点较高,可及时够苗;够苗后增长平缓,高峰苗数量较少、下降平缓,成穗率高(78.0%左右)。群体叶面积指数前期增长较缓,最大值出现在孕穗期,为8.0左右,此后下降缓慢,成熟期仍保持3.5以上;群体光合势生育前期较小,中、后期较大,抽穗至成熟期光合势为300×104 m2 d hm-2以上,总光合势为560×104 m2 d hm-2以上。拔节前干物质量积累速度较慢,拔节后积累速度较快,至抽穗期群体干物质量为10.5 t hm-2左右,抽穗后积累量亦高,成熟期干物质量达19.0 t hm-2左右,后期茎鞘物质转运率大于14.0%。超高产群体根量多、活力较强;植株吸氮能力强、成熟期氮素累积量高,氮素利用率40%以上。根据双季杂交晚粳稻超高产形成特征,我们探讨了培育双季晚粳稻超高产群体的关键栽培技术。展开更多
基金Supported by National Key Technology Research and Development Program of China(2012BAD15B03)the Youth Innovation Fund of Jiangxi Academy of Agricultural Sciences(2010-CQN004)~~
文摘Using a split plot design, super high-yielding early rice "Zhongjiazao 17"and "Ganxin 203" and super high-yielding late rice "Ganxin 688" and "Wufengy-ouT025" were taken as materials with planting density the same at 312 000 hil s/hm2, to explore the effects of RS/IS (Ratio of row spacing to intrarow row spacing) on yield, top three leaves morphological features and its relationship of them in 2011 and 2012. The results showed that, whether early or late rice, biomass, accumula-tion and apparent utilizing rate of nitrogen were lower in RS/IS5.0 (40.0 cm ×8.0 cm) treatment, but yield of rice was higher in RS/IS2.0 (25.0 cm ×12.8 cm) treatment;grain numbers per spike of rice was more in RS/IS2.8 (30.0 cm×10.7 cm) treatment, and thousand-grain weight of rice was higher in RS/IS1.3 (20.0 cm×16.0 cm) treat-ment. For 4 varieties of early or late rice aforementioned, basal angle, opening an-gle and leaf area of 2nd leaf from top were larger in RS/IS5.0 treatment, and basal angle and opening angle were smal er in RS/IS2.0 treatment and leaf area smal er in RS/IS1.3 treatment.
文摘本研究旨在明确传统双季晚籼稻地区双季杂交晚粳稻超高产产量构成及其群体特征,阐明双季杂交晚粳稻超高产形成规律。以江西省上高县6.77 hm2连片双季杂交晚粳稻高产攻关示范方为依托,选用杂交粳稻甬优8号为材料,对中产(8.25~9.75 t hm–2)、高产(9.75~10.50 t hm–2)和超高产(>10.50 t hm–2)3个产量水平群体的产量构成及群体特征进行系统比较研究。结果表明,与中产、高产水平群体相比,超高产水平群体表现穗数足、穗型大、群体颖花量多(50 000×104 hm-2以上)的显著特点,但结实率和千粒重略低,差异不显著;群体茎蘖动态上,群体起点较高,可及时够苗;够苗后增长平缓,高峰苗数量较少、下降平缓,成穗率高(78.0%左右)。群体叶面积指数前期增长较缓,最大值出现在孕穗期,为8.0左右,此后下降缓慢,成熟期仍保持3.5以上;群体光合势生育前期较小,中、后期较大,抽穗至成熟期光合势为300×104 m2 d hm-2以上,总光合势为560×104 m2 d hm-2以上。拔节前干物质量积累速度较慢,拔节后积累速度较快,至抽穗期群体干物质量为10.5 t hm-2左右,抽穗后积累量亦高,成熟期干物质量达19.0 t hm-2左右,后期茎鞘物质转运率大于14.0%。超高产群体根量多、活力较强;植株吸氮能力强、成熟期氮素累积量高,氮素利用率40%以上。根据双季杂交晚粳稻超高产形成特征,我们探讨了培育双季晚粳稻超高产群体的关键栽培技术。