Genotypic variation in nitrogen use efficiency in medium- and long-duration rice |
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| Institution: | 1. Chinese National Center for Rice Improvement / State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China;2. Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;1. Eco-environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, 201403, PR China;2. Shanghai Engineering Research Centre of Low-carbon Agriculture (SERCLA), Shanghai, 201415, PR China;3. Department of Soils and Water, Faculty of Agriculture, New Valley University, Egypt;1. National Engineering and Technology Center for Information Agriculture, Engineering Research Center of Smart Agriculture, Ministry of Education, Key Laboratory for Crop System Analysis and Decision Making, Ministry of Agriculture, Jiangsu Key Laboratory for Information Agriculture, Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China;2. Key Laboratory of Specialty Agri-product Quality and Hazard Controlling Technology of Zhejiang Province, College of Life Sciences, China Jiliang University, Xueyuan Street No. 258, Hangzhou 310018, PR China;3. Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki 305-8604, Japan;1. Key Laboratory of Crop Cultivation and Farming System, Guangxi University, Nanning 530004, China;2. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning 530004, China;3. Department of Agronomy, The University of Agriculture Peshawar, Peshawar 25130, Pakistan;1. College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China;2. Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | A field experiment was conducted in the dry season at Los Baños, Philippines, to assess the differences in grain yield and N utilization of 10 medium-duration (119±4 days after seeding DAS]) genotypes and 10 long-duration (130±4 DAS) ones with varying acquisition and usage of soil and fertilizer N. Significant differences among genotypes were observed in grain yield and N uptake, efficiency and partitioning parameters (physiological N use efficiency PNUE], agronomic N use efficiency ANUE], apparent recovery AR], partial factor productivity of applied N PFPN], N productivity index NPI], and N harvest index NHI]). The N-efficient genotypes that produced high grain yield at both low and high levels of N were IR54790-B-B-38, BG380-2, BG90-2 (medium-duration), and IR3932-182-2-3-3-2, IR54853-B-B-318, and IR29723-88-2-3-3 (long-duration). Inefficient genotypes that produced low yields at low N levels but responded well to N application were IR58125-B-B-42, IR49457-33-1-2-2-2, and BG34-8 (medium-duration), and IR8192-200-3-3-1-1, IR21848-65-3-2-2, and PR106 (long-duration). IR20 (medium) and Palawan (long-duration) were N-inferior genotypes giving low yields at both low and high N levels. Increase in grain yield was highly correlated with N uptake (r2=0.75**). The grain yield-N uptake relationship for individual genotypes indicated significant differences in slope and in the yield obtained with soil N (GY0). Differences in GY0 were due to genotypic variation in N uptake and efficiency of use. NHI was related to both N uptake and use efficiency. NPI, which integrated both GY0 and PNUE, provided a better ranking of genotypes. The performance of efficient and inefficient genotypes over a range of soil and fertilizer N supply was consistent over three seasons of trials. |
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