Nitrogen nutrition index and its relationship to N use efficiency in linseed |
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| Authors: | Christos A Dordas |
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| Institution: | 1. Institute of Natural Fibres and Medicinal Plants, ul. Wojska Polskiego 71 B, 60-630 Poznań, Poland;2. Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China;3. Institute of Industrial Crops, Heilongjiang Academy of Agricultural Sciences, Harbin, China;4. Center for Renewable Energy Sources and Saving, Pikermi Attikis, Greece;5. LRCAF Upyt? Experimental Station, Upyt?, Lithuania;1. Department of Agronomy, University of Almeria, Carretera de Sacramento s/n, 04120 La Cañada de San Urbano, Almería, Spain;2. BITAL Research Centre for Agricultural and Food Biotechnology, University of Almeria, Carretera de Sacramento s/n, 04120 La Cañada de San Urbano, Almería, Spain;1. International Center for Agro-Informatics and Sustainable Development (ICASD), College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;2. National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China;3. Department of Agriculture, Qingfeng Farm, Hulin, Heilongjiang 158421, China;4. College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010019, China;5. Center for Spatial Technologies and Remote Sensing (CSTARS), Department of Land, Air, and Water Resources, University of California, Davis, CA 95616, USA;6. Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523, USA;1. South Australian Research and Development Institute, Waite Campus, Australia;2. CSBP Kwinana Beach Road, PO Box 345, Kwinana, Australia;3. Hart Field-Site Group Inc., Clare, 5453, Australia |
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| Abstract: | Plant-based diagnostic techniques such as the nitrogen nutrition index (NNI) are used to determine the level of crop N nutrition, but research, especially on linseed, is limited. The objectives of this study were to determine whether there is a relationship between the NNI of linseed and N use efficiency (NUE) and to use NNI as a diagnostic tool for predicting seed yield response to N fertilization. The relationship between NNI and NUE was investigated in a two year field study of three linseed cultivars (Livia, Lirina, Creola) under different N fertilization conditions (0, 40, and 80 kg ha?1). N fertilization affected N concentration in different plant parts. The NNI varied from 0.65 to 1.16 across years, growth stage, and cultivar and was affected by the fertilization level. Linseed NUE and its components (N uptake efficiency and N utilization efficiency) were also affected by the cultivar, N fertilization, growing season, and interactions among these variables. N utilization efficiency accounted for more of the variation of NUE than did N uptake efficiency in most cases, and a negative correlation was found between NUE and N utilization efficiency and also between seed yield and NNI. This study provides new information about the effect of N application on NNI and NUE in linseed. High yields of linseed are dependent on an adequate supply of N, which can be diagnosed using NNI. |
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