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不同施氮量对两系杂交中籼稻产量和衰老的影响
史方祝,李胜群,蒋继武,柯建,何清华,武立权
0
(凤台县水稻原种场,淮南 232100;合肥丰乐种业股份有限公司,合肥 230036;安徽农业大学农学院,合肥 230036)
摘要:
以超高产水稻品种丰两优香1号为材料,在常规大田生产条件下,分析不同氮肥用量对两系杂交中籼稻产量、氮肥农学利用效率以及功能叶衰老的影响。结果表明,施氮量在0~255 kg·hm-2范围内,两系稻产量、群体质量和氮肥农学利用效率随施氮量增加而提高,以255 kg·hm-2施氮处理的产量最高(11786.4 kg·hm-2)、氮肥农学利用率最大;施氮量增加到300 kg·hm-2,产量、群体质量和氮肥农学利用率均下降。氮素营养影响水稻衰老进程,适宜施氮量(255 kg·hm-2)和较高氮肥农学利用率,能保证两系杂交中籼稻齐穗后功能叶不早衰,有利于后期植株光合能力提高和光合产物积累,使后期物质积累贡献率提高,为获得高产奠定基础。
关键词:  两系稻  氮肥  产量  衰老
DOI:
基金项目:安徽省自然科学资金(1208085MC34), 国家科技支撑项目(2011BAD16B06、2012BAD04B09、2012BAD07B02、
Effects of different nitrogen levels on two-line indica hybrid rice yields and senescence
SHI Fangzhu,LI Shengqun,JIANG Jiwu,KE Jian,HE Qinghua,WU Liquan
(Rice Breeding Farm of Fengtai County, Huainan 231200;Hefei Fengle Seed Co., Ltd., Hefei 230036;School of Agronomy, Anhui Agricultural University, Hefei 230036)
Abstract:
Super high-yielding rice variety Fengliangyouxiang 1 was used to analyze the impact of different nitrogen application rates on group characteristics, nitrogen agronomic utilization and functional leaf senescence of two-line medium indica hybrid rice under the condition of conventional field test. The results showed as follows: when the nitrogen rate was in the range of 0-255kg·hm-2, two-line hybrid rice production, population quality and nitrogen agronomic utilization increased along with the increase of nitrogen application rate; when the nitrogen application treatment was of 255 kg·hm-2, it had the highest yield (11786.4 kg·hm-2) and the maximum nitrogen agronomic utilization; when the nitrogen rate increased from 255 to 300 kg·hm-2, the production, population quality and nitrogen agronomic utilization decreased. Rice aging process was affected by nitrogen nutrition. The optimum nitrogen application rate (255 kg·hm-2) and a relatively high nitrogen agronomic utilization could ensure that the functional leaves of the two-line medium indica hybrid rice would not premature aging after the full heading, which is favorable for enhancing plant photosynthetic capacity and the accumulation of photosynthetic products at later stage, increasing the material accumulate contribution rate in later period, so as to lay a foundation for high yield.
Key words:  two-line indica hybrid rice  nitrogen fertilizer  yield  senescence

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