New Critical Nitrogen Curve Based on Leaf Area Index for Winter Wheat. (1st March 2014)
- Record Type:
- Journal Article
- Title:
- New Critical Nitrogen Curve Based on Leaf Area Index for Winter Wheat. (1st March 2014)
- Main Title:
- New Critical Nitrogen Curve Based on Leaf Area Index for Winter Wheat
- Authors:
- Zhao, Ben
Yao, Xia
Tian, YongChao
Liu, XiaoJun
Ata-Ul-Karim, Syed Tahir
Ni, Jun
Cao, WeiXing
Zhu, Yan - Abstract:
- Abstract : Accurate forecasting of N required for plant growth can help optimize grain yields, farm profits, and N use efficiency and reduce the risk of environmental pollution. The objectives of this study were to: (i) establish a critical N ( N c ) dilution curve for winter wheat ( Triticum aestivum L.) based on the leaf area index (LAI), (ii) compare this curve with N c dilution curves for winter wheat that are based on plant dry matter, and (iii) assess the plausibility of using this new curve to estimate the N status of winter wheat. Four field experiments were conducted with different N application rates. Twenty plants from each plot were sampled from the Feekes 3 to the Feekes 10.5 stage for growth analysis. The relationship between N c and LAI could be described by a negative power equation, N c = 4.06LAI −0.4, when the LAI values were in the range of 1.4 to 7.5. For LAI values <1.4, however, the constant value N c = 3.58% was used. The N nutrition index (NNI) ranged from 0.34 to 1.31 during the vegetative stage under different N application rates from 2009 to 2011. There was a significant positive relationship between differences in NNI and differences in N application rates across four wheat development stages. Validation of the models with independent data produced a root mean squared error of 28 kg ha −1 . The N c dilution curve identified limiting and nonlimiting wheat N status and could be used as a reliable indicator of in‐season N stress of wheat grown inAbstract : Accurate forecasting of N required for plant growth can help optimize grain yields, farm profits, and N use efficiency and reduce the risk of environmental pollution. The objectives of this study were to: (i) establish a critical N ( N c ) dilution curve for winter wheat ( Triticum aestivum L.) based on the leaf area index (LAI), (ii) compare this curve with N c dilution curves for winter wheat that are based on plant dry matter, and (iii) assess the plausibility of using this new curve to estimate the N status of winter wheat. Four field experiments were conducted with different N application rates. Twenty plants from each plot were sampled from the Feekes 3 to the Feekes 10.5 stage for growth analysis. The relationship between N c and LAI could be described by a negative power equation, N c = 4.06LAI −0.4, when the LAI values were in the range of 1.4 to 7.5. For LAI values <1.4, however, the constant value N c = 3.58% was used. The N nutrition index (NNI) ranged from 0.34 to 1.31 during the vegetative stage under different N application rates from 2009 to 2011. There was a significant positive relationship between differences in NNI and differences in N application rates across four wheat development stages. Validation of the models with independent data produced a root mean squared error of 28 kg ha −1 . The N c dilution curve identified limiting and nonlimiting wheat N status and could be used as a reliable indicator of in‐season N stress of wheat grown in eastern China. … (more)
- Is Part Of:
- Agronomy Journal. Volume 106:Number 2(2014)
- Journal:
- Agronomy Journal
- Issue:
- Volume 106:Number 2(2014)
- Issue Display:
- Volume 106, Issue 2 (2014)
- Year:
- 2014
- Volume:
- 106
- Issue:
- 2
- Issue Sort Value:
- 2014-0106-0002-0000
- Page Start:
- 379
- Page End:
- 389
- Publication Date:
- 2014-03-01
- Subjects:
- Agronomy -- Periodicals
630 - Journal URLs:
- http://onlinelibrary.wiley.com/ ↗
- DOI:
- 10.2134/agronj2013.0213 ↗
- Languages:
- English
- ISSNs:
- 0002-1962
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 12766.xml