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| Determining N supplied sources and N use efficiency for peanut under applications of four forms of N fertilizers labeled by isotope 15N |
| WANG Cai-bin, ZHENG Yong-mei, SHEN Pu, ZHENG Ya-ping, WU Zheng-feng, SUN Xue-wu, YU Tian-yi, FENG Hao |
| Shandong Peanut Research Institute, Qingdao 266100, P.R.China |
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摘要 Rational application of different forms of nitrogen (N) fertilizer for peanut (Arachis hypogaea L.) requires tracking the N supplied sources which are commonly not available in the differences among the three sources: root nodule, soil and fertilizer. In this study, two kinds of peanut plants (nodulated variety (Huayu 22) and non-nodulated variety (NN-1)) were choosed and four kinds of N fertilizers: urea-N (CONH2-N), ammonium-N (NH4 +-N), nitrate-N (NO3 –-N) and NH4 ++NO3 –-N labeled by 15N isotope were applied in the field barrel experiment in Chengyang Experimental Station, Shandong Province, China, to determine the N supplied sources and N use efficiency over peanut growing stages. The results showed that intensities and amounts of N supply from the three sources were all higher at middle growing stages (pegging phase and podding phase). The accumulated amounts of N supply from root nodule, soil and fertilizer over the growing stages were 8.3, 5.3 and 3.8 g m–2 in CONH2-N treatment, which are all significantly higher than in the other three treatments. At seedling phase, soil supplied the most N for peanut growth, then root nodule controlled the N supply at pegging phase and podding phase, but soil mainly provided N again at the last stage (pod filling phase). For the whole growing stages, root nodule supplied the most N (47.8 and 43.0%) in CONH2-N and NH4 +-N treatments, whereas soil supplied the most N (41.7 and 40.9%) in NH4 ++ NO3 –-N and NO3 –-N treatments. The N use efficiency was higher at pegging phase and podding phase, while accumulated N use efficiency over the growing stages was higher in CONH2-N treatment (42.2%) than in other three treatments (30.4% in NH4 +-N treatment, 29.4% in NO3 –-N treatment, 29.4% in NH4 ++NO3 –-N treatment). In peanut growing field, application of CONH2-N is a better way to increase the supply of N from root nodule and improve the N use efficiency.
Abstract Rational application of different forms of nitrogen (N) fertilizer for peanut (Arachis hypogaea L.) requires tracking the N supplied sources which are commonly not available in the differences among the three sources: root nodule, soil and fertilizer. In this study, two kinds of peanut plants (nodulated variety (Huayu 22) and non-nodulated variety (NN-1)) were choosed and four kinds of N fertilizers: urea-N (CONH2-N), ammonium-N (NH4 +-N), nitrate-N (NO3 –-N) and NH4 ++NO3 –-N labeled by 15N isotope were applied in the field barrel experiment in Chengyang Experimental Station, Shandong Province, China, to determine the N supplied sources and N use efficiency over peanut growing stages. The results showed that intensities and amounts of N supply from the three sources were all higher at middle growing stages (pegging phase and podding phase). The accumulated amounts of N supply from root nodule, soil and fertilizer over the growing stages were 8.3, 5.3 and 3.8 g m–2 in CONH2-N treatment, which are all significantly higher than in the other three treatments. At seedling phase, soil supplied the most N for peanut growth, then root nodule controlled the N supply at pegging phase and podding phase, but soil mainly provided N again at the last stage (pod filling phase). For the whole growing stages, root nodule supplied the most N (47.8 and 43.0%) in CONH2-N and NH4 +-N treatments, whereas soil supplied the most N (41.7 and 40.9%) in NH4 ++ NO3 –-N and NO3 –-N treatments. The N use efficiency was higher at pegging phase and podding phase, while accumulated N use efficiency over the growing stages was higher in CONH2-N treatment (42.2%) than in other three treatments (30.4% in NH4 +-N treatment, 29.4% in NO3 –-N treatment, 29.4% in NH4 ++NO3 –-N treatment). In peanut growing field, application of CONH2-N is a better way to increase the supply of N from root nodule and improve the N use efficiency.
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Received: 30 September 2014
Accepted:
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| Fund: This work was supported by the Youth Scientific Research Foundation of Shandong Academy of Agricultural Sciences, China (2014QNM27), the Applying Basic Research Project of Qingdao, Shandong Province, China (14-2-4-90-jch), the Modern Agricultural Industry Technology System, China (SDAIT-05-021-04), the National Key Technology R&D Program of China (2014BAD11B04), the Key Innovation of Science and Technology Project of Shandong Academy of Agricultural Sciences, China (2014CXZ06-2; 2014CXZ11-2). |
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Corresponding Authors:
ZHENG Yaping,Tel: +86-532-87632130, Fax: +86-532-87626832,E-mail: ypzheng62@126.com.
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| About author: WANG Cai-bin, E-mail: caibinw@126.com; ZHENG Yong-mei,E-mail: ymzhengrice@163.com;* These authors contributed equally to this study. |
Cite this article:
WANG Cai-bin, ZHENG Yong-mei, SHEN Pu, ZHENG Ya-ping, WU Zheng-feng, SUN Xue-wu, YU Tian-yi, FENG Hao.
2016.
Determining N supplied sources and N use efficiency for peanut under applications of four forms of N fertilizers labeled by isotope 15N. Journal of Integrative Agriculture, 15(2): 432-439.
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