中国水稻科学 ›› 2019, Vol. 33 ›› Issue (4): 347-356.DOI: 10.16819/j.1001-7216.2019.8140

• 研究报告 • 上一篇    下一篇

适雨灌溉下氮肥运筹对水稻光合特性、氮素吸收及产量形成的影响

晏军1,2, 吴启侠1, 朱建强1,*(), 张露萍3   

  1. 1长江大学 农学院,湖北 荆州 434025
    2盐城市新洋农业试验站,江苏 盐城 224049
    3湖北省荆州农业气象试验站,湖北 荆州 434025
  • 收稿日期:2018-12-24 修回日期:2019-02-21 出版日期:2019-07-10 发布日期:2019-07-10
  • 通讯作者: 朱建强
  • 基金资助:
    国家重点研发计划资助项目(2016YFD0800500);湖北省科技支撑计划资助项目(2014BCB038)

Effects of Nitrogen Application on Rice Photosynthetic Characteristics, Nitrogen Uptake and Grain Yield Formation Under Rainfall-adapted Water Management

Jun YAN1,2, Qixia WU1, Jianqiang ZHU1,*(), Luping ZHANG3   

  1. 1 College of Agriculture, Yangtze University, Jingzhou 434025, China
    2Xinyang Experimental Station of Agriculture, Yancheng 224049, China
    3 Jingzhou Agricultural Meteorological Trial Station, Jingzhou 434025, China
  • Received:2018-12-24 Revised:2019-02-21 Online:2019-07-10 Published:2019-07-10
  • Contact: Jianqiang ZHU

摘要:

【目的】为合理利用水稻生长期间的降雨,改善江汉平原地区稻田氮肥管理。【方法】采用田间小区试验,研究了常规淹灌(FI)和适雨灌溉(RAI)条件下,农民习惯施肥(FFP)、30%尿素+70%控释掺混肥(30%N+70%CRF)和优化减氮施肥(OPT-N)对降雨利用率、水稻产量、光合特性、干物质积累及氮吸收利用的影响。【结果】1)RAI能在节省水资源同时提升稻田对雨水的储蓄和利用能力,与FI相比可减少田间灌溉水量41.7%,各生育阶段水稻叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)、干物质积累、氮素吸收以及产量均有不同程度的增加;2)两种水管理方式下,与FFP处理相比,OPT-N处理水稻在分蘖期的PnGsCiTr、干物质积累和氮素吸收显著降低,但在孕穗期-灌浆期有所增加,对最终产量形成影响不大;RAI结合30%N+70%CRF处理有利于水稻生育前期PnGsCiTr的增加,提升生育中后期干物质积累量,氮素吸收量在分蘖期显著高于OPT-N和FFP,在齐穗期和成熟期显著高于FFP,有效穗数、穗长、千粒质量和结实率在各处理间表现最高,实际产量相较常规水肥管理可增产10.4%。【结论】适雨灌溉条件下,OPT-N不会显著影响水稻的生长及产量,30%N+70%CRF有助于水稻光合作用、氮素吸收及产量的增加。

关键词: 适雨灌溉, 氮肥运筹, 产量, 光合特性, 氮素吸收

Abstract:

【Objective】The research aims to make rational use of rainfall during rice growth, improve paddy nitrogen fertilizer management practice in the Jianghan Plain.【Method】The field plot experiment with two irrigation regimes (conventional flooding irrigation, FI; rainfall-adapted irrigation, RAI) and three nitrogen fertilizer managements (farmers’ fertilization practice, FFP; 30% urea+70% controlled release compound fertilizer, 30%N+70%CRF; optimized and reduced nitrogen fertilizer application, OPT-N) were carried out to study the effects of water and fertilizer managements on rainfall utilization rate, rice yield, photosynthetic characteristics, dry matter accumulation and nitrogen uptake and utilization.【Result】1) Compared with FI, RAI reduced the irrigation quantity by 41.7%, economized water resources while improved the ability of paddy to saving and utilizing rainfall, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr), dry matter accumulation, nitrogen absorption and grain yield in varying degrees during rice growth. 2) Compared with FFP treatment under two water management modes, OPT-N significantly decreased Pn, Gs, Ci, Tr, dry matter accumulation and nitrogen uptake of rice at tillering stage, but increased the above-mentioned indexes from booting to filling stages, but had little effect on final yield formation. 3) RAI combined with 30% N + 70% CRF treatment helped increase Pn, Gs, Ci and Tr in the early growth stage, and promoted the accumulation of dry matter significantly in the middle and late growth stages. The nitrogen uptake was significantly higher than in OPT-N and FFP during the tillering stage, and was significantly higher than FFP at the full heading stage and mature stage. Effective panicle number, panicle length, 1000-grain quality and seed setting rate were the highest among treatments, and the actual yield was 10.4% higher than that in conventional water and fertilizer management.【Conclusion】Under the rainfall-adapted irrigation, OPT-N had no significant effect on rice growth and yield, 30% N+70% CRF was helpful to increase photosynthesis, nitrogen uptake and yield of rice.

Key words: rainfall-adapted water management, nitrogen application, yield, photosynthetic characteristics, nitrogen uptake

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