Early detection of N deficiency in a wheat crop using physiological and radiometric methods

Vouillot, Marie Odile; Huet, Philippe; Boissard, P.

doi:10.1051/agro:19980202

Cited by 53 publications

(32 citation statements)

References 27 publications

(29 reference statements)

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“…Therefore, we limited our analysis to the relationship between NNI and SPAD values of L4 at booting stage. The NNI was positively related to SPAD values (R In Europe, NNI is recognized as a reference method for detecting N deficiency in wheat crop (Justes et al, 1997;Vouillot et al, 1998). Because of the practical issues of using NNI are for crop diagnosis in farmers' fields, alternative methods are required to assess crop N status.…”

Section: Correlation Of Spad and Rspad Values With Nni Atmentioning

confidence: 99%

“…The non-linear relationship between SPAD values and NNI has been proved in fescue (Errecart et al, 2012), corn (Ziadi et al, 2008), wheat (Vouillot et al, 1998;Prost and Jeuffroy, 2007) and cocksfoot (Duru, 2002), and the correlation of RSPAD values with NNI, and relative grain yield has been studied only in corn (Ziadi et al, 2008) and wheat (Debaeke et al, 2006). Debaeke et al (2006) also found that the non-linear relationship between RSPAD values and NNI was not significantly affected by years, genotypes, and developmental stages.…”

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confidence: 99%

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SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status

Yang

et al. 2014

Plant Production Science

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Section: Correlation Of Spad and Rspad Values With Nni Atmentioning

confidence: 99%

mentioning

confidence: 99%

SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status

Yang

et al. 2014

Plant Production Science

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“…Optical techniques are not effective in estimating leaf N concentration directly; however, they are effective in estimating leaf chlorophyll concentration (Botha et al 2006). Leaf N and chlorophyll concentrations are frequently well correlated within an individual crop species, for example in wheat (Vouillot et al 1998), corn (Ercoli et al 1993) and potatoes (Vos and Bom 1993).…”

Section: Plant-based Diagnostic Testsmentioning

confidence: 99%

Opportunities for improved fertilizer nitrogen management in production of arable crops in eastern Canada: A review

Zebarth¹,

Drury²,

Tremblay³

et al. 2009

Can. J. Soil. Sci.

177

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There is increasing public pressure to reduce the environmental impacts of agricultural production. Therefore, one key challenge to producers is to manage their crop production systems in order to minimize losses of nitrogen to air or water, while achieving crop yield and quality goals. Many strategies have been developed in recent years to meet this challenge. These include: development of new tools to measure crop N status in order to refine in-season fertilizer N management, development of new soil N tests to improve prediction of soil N supply, development of new fertilizer N products with release patterns more closely matched to crop N uptake patterns, and development of site-specific N management strategies. We review the opportunities and limitations to these new strategies within different arable crop production systems under the humid and sub-humid soil moisture regimes present in eastern Canada. Future research opportunities to improve the efficiency of fertilizer N utilization include development of practical methods to predict the magnitude of soil N mineralization; refinement of decision-making processes which take into consideration the crop N status and soil properties as a basis for variable rate fertilizer N application; development of affordable controlled-release fertilizer N products with improved N release characteristics; development of practical methods for capturing and recycling nutrient-laden drainage water; development of gene expression profiling based techniques to identify crop N stress; and application of crop genomics and molecular breeding techniques to accelerate the development of new cultivars with increased N use efficiency. Key words: Soil N tests, plant N tests, nitrogen fertilizers, nitrogen cycling

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“…As a result, a reduced number of plants is usually sampled and the spatial heterogeneity of N needs is poorly represented. The estimation of the NNI based on spectral data has been proven feasible using field spectrometers operated on the ground [8] or mounted on tractors [9]. However the possibility to detect the N status using remotely rather than proximal sensed information has still to be tested [10].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Status Assessment for Variable Rate Fertilization in Maize through Hyperspectral Imagery

et al. 2014

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This paper presents a method for mapping the nitrogen (N) status in a maize field using hyperspectral remote sensing imagery. An airborne survey was conducted with an AISA Eagle hyperspectral sensor over an experimental farm where maize (Zea mays L.) was grown with two N fertilization levels (0 and 100 kg N ha The %N a and the W flight were then mapped and used to compute the NNI map over the entire field. The NNI map agreed with the NNI estimated using field data through traditional destructive measurements (R 2 = 0.70) confirming the potential of using remotely sensed indices to assess the crop N condition. Finally, a method to derive a pixel based variable rate N fertilization map was proposed as the difference between the actual N content and the optimal N content. We think that the proposed operational methodology is promising for precision farming since it represents an innovative attempt to derive a variable rate N fertilization map based on the actual crop N status from an aerial hyperspectral image.

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Early detection of N deficiency in a wheat crop using physiological and radiometric methods

Abstract: -A winter wheat (cv Soissons) crop was made N deficient during stem elongation. The effects of the N stress were quantified by measuring the nitrogen nutrition index (NNI) (used as reference), proteolytic activity in the leaves, the rate of carbon dioxide (CO 2 )

Cited by 53 publications

References 27 publications

SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status

SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status

Opportunities for improved fertilizer nitrogen management in production of arable crops in eastern Canada: A review

Nitrogen Status Assessment for Variable Rate Fertilization in Maize through Hyperspectral Imagery

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