Determination of critical nitrogen dilution curve based on stem dry matter in rice
Plant analysis is a very promising diagnostic tool for assessment of crop nitrogen (N) requirements in perspectives of cost effective and environment friendly agriculture. Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future...
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| description | Plant analysis is a very promising diagnostic tool for assessment of crop nitrogen (N) requirements in perspectives of cost effective and environment friendly agriculture. Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future crops. The present study was aimed to develop a new methodology for determining the critical nitrogen (Nc) dilution curve based on stem dry matter (SDM) and to assess its suitability to estimate the level of N nutrition for rice (Oryza sativa L.) in east China. Three field experiments with varied N rates (0-360 kg N ha(-1)) using three Japonica rice hybrids, Lingxiangyou-18, Wuxiangjing-14 and Wuyunjing were conducted in Jiangsu province of east China. SDM and stem N concentration (SNC) were determined during vegetative stage for growth analysis. A Nc dilution curve based on SDM was described by the equation (Nc = 2.17W(-0.27) with W being SDM in t ha(-1)), when SDM ranged from 0.88 to 7.94 t ha(-1). However, for SDM < 0.88 t ha(-1), the constant critical value Nc = 1.76% SDM was applied. The curve was dually validated for N-limiting and non-N-limiting growth conditions. The N nutrition index (NNI) and accumulated N deficit (Nand) of stem ranged from 0.57 to 1.06 and 51.1 to -7.07 kg N ha(-1), respectively, during key growth stages under varied N rates in 2010 and 2011. The values of ΔN derived from either NNI or Nand could be used as references for N dressing management during rice growth. Our results demonstrated that the present curve well differentiated the conditions of limiting and non-limiting N nutrition in rice crop. The SDM based Nc dilution curve can be adopted as an alternate and novel approach for evaluating plant N status to support N fertilization decision during the vegetative growth of Japonica rice in east China. |
| doi_str_mv | 10.1371/journal.pone.0104540 |
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Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future crops. The present study was aimed to develop a new methodology for determining the critical nitrogen (Nc) dilution curve based on stem dry matter (SDM) and to assess its suitability to estimate the level of N nutrition for rice (Oryza sativa L.) in east China. Three field experiments with varied N rates (0-360 kg N ha(-1)) using three Japonica rice hybrids, Lingxiangyou-18, Wuxiangjing-14 and Wuyunjing were conducted in Jiangsu province of east China. SDM and stem N concentration (SNC) were determined during vegetative stage for growth analysis. A Nc dilution curve based on SDM was described by the equation (Nc = 2.17W(-0.27) with W being SDM in t ha(-1)), when SDM ranged from 0.88 to 7.94 t ha(-1). However, for SDM < 0.88 t ha(-1), the constant critical value Nc = 1.76% SDM was applied. The curve was dually validated for N-limiting and non-N-limiting growth conditions. The N nutrition index (NNI) and accumulated N deficit (Nand) of stem ranged from 0.57 to 1.06 and 51.1 to -7.07 kg N ha(-1), respectively, during key growth stages under varied N rates in 2010 and 2011. The values of ΔN derived from either NNI or Nand could be used as references for N dressing management during rice growth. Our results demonstrated that the present curve well differentiated the conditions of limiting and non-limiting N nutrition in rice crop. The SDM based Nc dilution curve can be adopted as an alternate and novel approach for evaluating plant N status to support N fertilization decision during the vegetative growth of Japonica rice in east China.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0104540</identifier><identifier>PMID: 25127042</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Agricultural economics ; Agricultural management ; Agriculture ; Agriculture - methods ; Analysis of Variance ; Biology and Life Sciences ; Cereal crops ; China ; Constraining ; Crops ; Crosses, Genetic ; Diagnostic software ; Diagnostic systems ; Dilution ; Dry matter ; Engineering ; Experiments ; Fertilization ; Field tests ; Growth conditions ; Hybrids ; Laboratories ; Nitrogen ; Nitrogen - analysis ; Nutrition ; Nutrition assessment ; Nutritional Physiological Phenomena - physiology ; Nutritional status ; Oryza - chemistry ; Oryza - physiology ; Oryza sativa japonica ; Plant Stems - chemistry ; Rice ; Species Specificity ; Stems ; Wheat</subject><ispartof>PloS one, 2014-08, Vol.9 (8), p.e104540-e104540</ispartof><rights>2014 Ata-Ul-Karim et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future crops. The present study was aimed to develop a new methodology for determining the critical nitrogen (Nc) dilution curve based on stem dry matter (SDM) and to assess its suitability to estimate the level of N nutrition for rice (Oryza sativa L.) in east China. Three field experiments with varied N rates (0-360 kg N ha(-1)) using three Japonica rice hybrids, Lingxiangyou-18, Wuxiangjing-14 and Wuyunjing were conducted in Jiangsu province of east China. SDM and stem N concentration (SNC) were determined during vegetative stage for growth analysis. A Nc dilution curve based on SDM was described by the equation (Nc = 2.17W(-0.27) with W being SDM in t ha(-1)), when SDM ranged from 0.88 to 7.94 t ha(-1). However, for SDM < 0.88 t ha(-1), the constant critical value Nc = 1.76% SDM was applied. The curve was dually validated for N-limiting and non-N-limiting growth conditions. The N nutrition index (NNI) and accumulated N deficit (Nand) of stem ranged from 0.57 to 1.06 and 51.1 to -7.07 kg N ha(-1), respectively, during key growth stages under varied N rates in 2010 and 2011. The values of ΔN derived from either NNI or Nand could be used as references for N dressing management during rice growth. Our results demonstrated that the present curve well differentiated the conditions of limiting and non-limiting N nutrition in rice crop. 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ata-Ul-Karim, Syed Tahir</au><au>Yao, Xia</au><au>Liu, Xiaojun</au><au>Cao, Weixing</au><au>Zhu, Yan</au><au>Zhang, Guoping</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Determination of critical nitrogen dilution curve based on stem dry matter in rice</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2014-08-15</date><risdate>2014</risdate><volume>9</volume><issue>8</issue><spage>e104540</spage><epage>e104540</epage><pages>e104540-e104540</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Plant analysis is a very promising diagnostic tool for assessment of crop nitrogen (N) requirements in perspectives of cost effective and environment friendly agriculture. Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future crops. The present study was aimed to develop a new methodology for determining the critical nitrogen (Nc) dilution curve based on stem dry matter (SDM) and to assess its suitability to estimate the level of N nutrition for rice (Oryza sativa L.) in east China. Three field experiments with varied N rates (0-360 kg N ha(-1)) using three Japonica rice hybrids, Lingxiangyou-18, Wuxiangjing-14 and Wuyunjing were conducted in Jiangsu province of east China. SDM and stem N concentration (SNC) were determined during vegetative stage for growth analysis. A Nc dilution curve based on SDM was described by the equation (Nc = 2.17W(-0.27) with W being SDM in t ha(-1)), when SDM ranged from 0.88 to 7.94 t ha(-1). However, for SDM < 0.88 t ha(-1), the constant critical value Nc = 1.76% SDM was applied. The curve was dually validated for N-limiting and non-N-limiting growth conditions. The N nutrition index (NNI) and accumulated N deficit (Nand) of stem ranged from 0.57 to 1.06 and 51.1 to -7.07 kg N ha(-1), respectively, during key growth stages under varied N rates in 2010 and 2011. The values of ΔN derived from either NNI or Nand could be used as references for N dressing management during rice growth. Our results demonstrated that the present curve well differentiated the conditions of limiting and non-limiting N nutrition in rice crop. The SDM based Nc dilution curve can be adopted as an alternate and novel approach for evaluating plant N status to support N fertilization decision during the vegetative growth of Japonica rice in east China.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>25127042</pmid><doi>10.1371/journal.pone.0104540</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Agricultural economics Agricultural management Agriculture Agriculture - methods Analysis of Variance Biology and Life Sciences Cereal crops China Constraining Crops Crosses, Genetic Diagnostic software Diagnostic systems Dilution Dry matter Engineering Experiments Fertilization Field tests Growth conditions Hybrids Laboratories Nitrogen Nitrogen - analysis Nutrition Nutrition assessment Nutritional Physiological Phenomena - physiology Nutritional status Oryza - chemistry Oryza - physiology Oryza sativa japonica Plant Stems - chemistry Rice Species Specificity Stems Wheat |
| title | Determination of critical nitrogen dilution curve based on stem dry matter in rice |
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