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作物学报 ›› 2015, Vol. 41 ›› Issue (09): 1406-1415.doi: 10.3724/SP.J.1006.2015.01406

• 耕作栽培·生理生化 • 上一篇    下一篇

控释尿素水氮耦合对夏玉米产量和光合特性的影响

李广浩, 赵斌*, 董树亭*, 刘鹏, 张吉旺, 何在菊   

  1. 山东农业大学农学院 / 作物生物学国家重点实验室, 山东泰安271018
  • 收稿日期:2014-12-25 出版日期:2015-09-12 网络出版日期:2015-09-12
  • 通讯作者: 赵斌, E-mail:zhaobin@sdau.edu.cn, Tel: 0538-8245838; 董树亭, E-mail:stdong@sdau.edu.cn
  • 作者简介:第一作者联系方式: 李广浩, E-mail:guanghaoli@126.com, Tel: 15275381215
  • 基金资助:
    本研究由国家自然科学基金项目(31171497), 国家公益性行业(农业)科研专项(201203096), 国家现代农业产业技术体系建设专项(CARS-02-20), 国家重点基础研究发展计划(973计划)项目(2011CB100105), 国家粮食丰产科技工程项目(2011BAD16B09), 山东省良种工程重大课题(鲁科农字[2011]186号), 国家自然科学基金青年基金项目(31301274)和山东省高等学校科技计划项目(J13LF08)资助

Effects of Coupling Controlled Release Urea with Water on Yield and Photosynthetic Characteristics in Summer Maize

LI Guang-Hao, ZHAO Bin*, DONG Shu-Ting*, LIU Peng, ZHANG Ji-Wang, HE Zai-Ju   

  1. Agronomy College of Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai’an 271018, China
  • Received:2014-12-25 Published:2015-09-12 Published online:2015-09-12

摘要: 采用旱棚盆栽试验, 以郑单958为材料设置3个水分水平(正常水分W3、轻度水分胁迫W2、重度水分胁迫W1)和高氮N3 (施纯氮315 kg hm-2)、中氮N2 (施纯氮210 kg hm-2)、低氮N1 (施纯氮105 kg hm-2)、不施氮N0四个控释尿素施氮水平, 探讨控释尿素水氮耦合对夏玉米产量和光合特性的影响。结果表明, 控释尿素水氮耦合对夏玉米产量和光合特性具有显著影响。相同水分条件下, 夏玉米产量随施氮量增加而增加, W1条件下增产13.17%~20.96%, W2条件下增产13.93%~32.48%, W3条件下增产14.37%~21.83%。相同施氮水平下, 产量也随水分增加而增加, W2N3、W3N2和W3N3的产量在所有处理中较高。水氮耦合对夏玉米穗位叶净光合速率的影响显著, W1条件下N3、N2和N1处理间差异不显著, 均显著高于N0, W2、W3各施氮处理的净光合速率随施氮量增加而增加, W3各处理的平均净光合速率高于其他2个水分处理, W2N3比W3N3和W3N2前期略低, 后期无显著差异。水氮耦合效应能有效减缓穗位叶的实际光化学效率ΦPSII、叶片光化学猝灭系数qP以及PSII反应中心的最大光能转换效率的下降速率, 提高光能利用率。控释尿素水氮耦合能有效提高夏玉米花后穗位叶净光合速率, 保证籽粒对营养物质的需求, 提高穗位叶实际和最大光化学效率, 从而提高夏玉米的产量, 产量构成因素中增加千粒重和穗粒数的优势较大。综合产量与光合特性、荧光特性的表现, 在田间持水量为75%±5%的土壤条件下, 控释尿素施氮量以纯氮210 kg hm-2为最佳; 在田间持水量为55%±5%的土壤条件下, 控释尿素施氮量以纯氮315 kg hm-2为宜。

关键词: 夏玉米, 控释尿素, 水氮耦合, 产量, 光合特性

Abstract: A experiment using Zhengdan 958 (a summer maize cultivar planted widely in China), with treatments of three water levels (normal water W3, mild water stress W2, severe water stress W1) and four amounts of controlled release urea nitrogen (N) (N3 was 315 kg ha-1, N2 was 210 kg ha-1, N1 was 105 kg ha-1 and N0 was no nitrogen) was carried out under the waterproof shed and potting conditions. The results showed there was significant influence of coupling water with controlled release urea on yield and photosynthetic characteristics in summer maize. Under the condition of same soil moisture, the yield showed a increasing trend with the amounts of N application increased. The yield increased by 13.17%-20.96% under severe water stress (W1), by 13.93%-32.48% under mild water stress (W2), and by 14.37%-21.83% under the condition of normal water (W3). Under the same amounts of N application, the yield was also improved with the increase of the soil moisture. The yields of W2N3, W3N2, and W3N3 were the highest among these treatments. The coupling effects of water and controlled release urea were significant on the photosynthetic rate in ear leaf. The photosynthetic rates of N3, N2, and N1 had no significant differences in W1, and were higher than these of N0 significantly. The photosynthetic rate of W2 and W3 treatments increased with the increase of N fertilizer application, the average photosynthetic rate in W3 was higher than that of W2 and W1, that of W2N3 was slightly lower than that of W3N3 and W3N2 at early flowering, and no significant difference in the late stage. The coupling effects of water and controlled release urea nitrogen could effectively improve the efficiency of light energy utilization and slow down the decline rates of the actual photochemical efficiency of PSII, coefficient of photochemical quenching (qP) of leaf and PSII reaction center of light conversion. High photosynthetic rate, actual and maximal photochemical efficiency of ear leaf after flowering in summer maize ensured the nutrients needs of grain filling, thus increased the yield. Higher yield was obtained due to the significant increase of kernels per ear and thousand seed weight among yield components. Under this experimental condition, controlled release urea N application rate of 210 kg ha-1 was the best treatment as the soil moisture content was 75%±5% of field capacity. We suggested that coupling controlled release urea N application rate of 315 kg ha-1 with soil moisture content of 55%±5% of field capacity is optimum.

Key words: Summer maize, Controlled release urea, Water and nitrogen coupling, Yield, Photosynthetic characteristics

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