&lt;b&gt;Relative chlorophyll contents in the evaluation of the nutritional status of nitrogen from xaraes palisade grass and determination of critical nitrogen sufficiency index

Costa, J.M.G. Sá da; Caputti, Gregory de Paula; Galzerano, Leandro; Silva, Wilton Ladeira da; Ruggieri, Ana Cláudia; Malheiros, Euclides Braga

doi:10.4025/actascianimsci.v37i2.24854

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…This indicates that increasing the N fertilization rate increases the amount of N in the leaves of these cowpea beans, which corresponds to a higher measured SPAD index. Teixeira Filho et al (2010) obtained a similar result with Triticum aestivum culture, Costa et al (2015) with Urochloa brizantha, Pocojeski et al (2015) with Oryza sativa, Porto et al (2014) with Cucumis sativus and Coelho et al (2010) also found a positive and significant correlation between total N concentration and SPAD index in two potato cultivars (Ágata and Asterix cultivars), which further confirms the results presented here. Paradoxically, Silva et al (2012) reported that there was no significant correlation between chlorophyll meter (SPAD index) and leaf N concentration in crambe crops, during full flowering.…”

Section: Discussionsupporting

confidence: 88%

“…As plants may show no outward effects while experiencing mild N deficiency, the visible effects of N depletion in plants may only be detected once the plant's production is significantly impaired (Fontes, 2001).Therefore, quick and practical methodologies are essential for the early diagnosis of N deficiency in plants. Foliar readings obtained using the SPAD-502 (Soil Plant Analysis Development) chlorophyll meter (Busato et al, 2010;Coelho et al, 2010;Pôrto et al, 2014;Costa et al, 2015;Pocojeski et al, 2015) are known to be correlated with N concentration in leaves (Coelho et al, 2010), and therefore facilitate measurement of N status in crops (Pôrto et al, 2014;Costa et al, 2015;Pocojeski et al, 2015). Alternative methods for estimating foliar N concentration include Dualex ® (Coelho et al, 2012), the leaf color chart (Yang et al, 2003) and recently, digital camera techniques (Li et al, 2010;Wang et al, 2014) combined with digital imaging software (Haim et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Application of digital images for nitrogen status diagnosis in three Vigna unguiculata cultivars

Santos¹,

Alves²,

Silva³

et al. 2016

Aust J Crop Sci

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The SPAD chlorophyll meter is widely used to indirectly monitor the nitrogen (N) status of various crops, which is important to ensure proper management of N fertilizers. Here, we propose that the freely available digital foliar analysis software AFSoft may be used to monitor N status with the same effectiveness as the SPAD meter. To verify the usefulness of AFSoft, we employed both SPAD meter readings and AFSoft note to estimate relative chlorophyll content in cowpea beans exposed to different N fertilization rates. The experiment followed a completely randomized design comprised of four replicates carried out in a factorial scheme, with five N fertilization rates (0, 50, 100, 200 and 300 mg pot-1) applied to three cowpea bean cultivars (BRS Itaim, BRS Guariba and BRS Novaera). At 45 days after emergence (DAE) of the plants, SPAD readings were obtained on the second trifoliate leaf. The whole leaf was subsequently digitally photographed and dried for the determination of total N concentration by applying acolour scale using AFSoft ® software. There was no significant interaction observed between N fertilization rate and cultivar for the evaluated variables. For all cultivars, increasing the rate of N fertilization increased the total observed N concentration as determined by both SPAD index and AFSoft note. The AFSoft note value was positively correlated with the total N concentration (r=0.95, P≤0.05; r=0.80, P≤0.01; r=0.86, P≤0.01) and the SPAD readings (r=0.99, P≤0.01; r=0.97, P≤0.05; r=0.97, P≤0.05) for the Itaim, Guariba and Novaera cultivars. These results suggest that N concentration in the leaves of cowpea bean cultivars can be estimated using AFSoft, which may serve as an alternative to SPAD meter readings.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Application of digital images for nitrogen status diagnosis in three Vigna unguiculata cultivars

Santos¹,

Alves²,

Silva³

et al. 2016

Aust J Crop Sci

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“…The RCC can be employed as an indicator of N nutritional status of the forage, although its use is not suggested during the dry period (Costa et al 2015). It could also be a parameter for use in establishing the recommended nitrogen fertilization (Yu-Sen et al 2015).…”

Section: Resultsmentioning

confidence: 99%

Nitrogen Fertilization of Paiaguás Grass: Production and Nutrition

Domingues

Santos

Backes

et al. 2021

Rev. Agric. Neotrop.

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Nitrogen (N) is a nutrient associated with the development of plant shoots, which makes it a vitally important element for the maintenance and sustainability of pasture. The goal of this study was to evaluate the effects of nitrogen fertilization on the productive and nutritional traits of Urochloa brizantha Paiaguás, as well as the efficiency of digital imaging and the use of a chlorophyll meter in obtaining green color indices. The experiment was conducted in the field on the Escola farm at the State University of Goiás, located in São Luís de Montes Belos, GO. A randomized-block design with five treatments and four replicates was adopted. Treatments consisted of four N rates (0, 75, 150, 300, and 600 kg ha -1 ) in the form of ammonium sulfate. The grass res ponded up to the N rate of 374 kg ha -1 for production-related traits, such as plant height, number of tillers, and shoot dry matter. Maximum dry matter yields were 21,225 and 13,710 kg ha -1 year -1 for the first and second cycles, respectively. Both the chlorophyll meter and digital imaging were efficient in indicating plant N nutritional status. Paiaguás grass responds to N similarly to other Urochloa brizantha cultivars.

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“…Chlorophyll content gives a measure of leaf nitrogen because there is a close association between the pigment and the nutrient. Moreover, considering that chlorophyll concentration varies with the stages of plant development, its estimation in the field in different phenological stages of a crop may give the farmer information about the nutritional status of the plants that allows them to make decisions related to the monitoring and management of agricultural activities (Costa et al, 2015;Elarab et al, 2015, Arantes et al, 2016. In addition, the monitoring of chlorophyll may be used as an indication of the plants' water status (Silva et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

TEMPORAL VARIATION AND SPATIAL DISTRIBUTION OF RELATIVE INDICES OF LEAF CHLOROPHYLL IN GRAPEVINE cv. CHARDONNAY

et al. 2019

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Variation in the spatial distribution of leaf chlorophyll content associated with the progression of the phenological cycle of crops may occur in cultivated areas as a result of the variability of environmental conditions and of the intrinsic properties of the plants. The objective of the present study was to model the trend in variation and assess the temporal stability of index of chlorophyll a, b, and total chlorophyll (Chla, Chlb, and Chlt, respectively), and to characterize the spatial distribution of Chlt index in grapevine cv. 'Chardonnay'. The assessments consisted of in situ measurements made with a portable meter in a commercial vineyard located in the municipality of Espírito Santo do Pinhal, state of São Paulo, Brazil, in the period between flowering and fruit maturation. Descriptive statistics were applied to the indices and regression models were fitted to ascertain the relationship of their mean variation with time. The temporal stability of Chlt index was estimated using Spearman's rank correlation analysis and thematic maps were created using geostatistical analysis and spatial estimation by ordinary kriging. The Chlb and Chlt indices were non-linearly associated with cycle progression and their decrease after the start of maturation was estimated. The temporal stability of the Chlt index was low and variation in its spatial distribution was observed over the assessed period.

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<b>Relative chlorophyll contents in the evaluation of the nutritional status of nitrogen from xaraes palisade grass and determination of critical nitrogen sufficiency index

Cited by 6 publications

References 17 publications

Application of digital images for nitrogen status diagnosis in three Vigna unguiculata cultivars

Application of digital images for nitrogen status diagnosis in three Vigna unguiculata cultivars

Nitrogen Fertilization of Paiaguás Grass: Production and Nutrition

TEMPORAL VARIATION AND SPATIAL DISTRIBUTION OF RELATIVE INDICES OF LEAF CHLOROPHYLL IN GRAPEVINE cv. CHARDONNAY

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