Spad index for diagnosis of nitrogen status in ‘Esmeralda’ peach

Benati, Jorge Atílio; Nava, Gilberto; Mayer, Newton Alex

doi:10.1590/0100-29452021093

Cited by 8 publications

(8 citation statements)

References 16 publications

(12 reference statements)

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“…Moreover, most previous studies using SPAD indicators focused on the nitrogen nutritional status to adjust fertilizer management practices during critical plant growth periods (Wang et al, 2006;Xiong et al, 2015;Cerovic et al, 2015;Benati et al, 2021). Our results found a better relationship between the SPAD and spur type (flowering vs nonflowering) for each cultivar.…”

Section: Resultssupporting

confidence: 48%

“…As reported in previous studies, the SPAD readings is a robust and satisfactory method to estimate the leaf chlorophyll concentrations or leaf nitrogen content, which is a significant component of chlorophyll molecule structure (Rostami et al, 2008;Brunetto et al, 2012;Romero et al, 2013;Benati et al, 2021). Moreover, the relationship between leaf chlorophyll content and SPAD values may be affected by the changes in cultivars, environmental factors, and management strategies (Argenta et al, 2004;Munoz-Huerta et al, 2013;Xiong et al, 2015).…”

Section: Resultsmentioning

confidence: 92%

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Flowering and Non-Flowering Spur Leaf Characteristics of 'Amasya' Apple and Its Comparison with Other Cultivars

Atay

2022

Horticultural Studies

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Understanding the attributes of spur leaves in apple trees is essential to gain more insight into the complex process of fruit development and quality. However, limited literature is available about the spur leaf characteristics of the 'Amasya' apple cultivar. In this work, the Soil Plant Analysis Development (SPAD) and leaf area were investigated in flowering and non-flowering spur leaves of 'Amasya' and six common apple cultivars. Significant differences among cultivars were observed for the SPAD and spur leaf area. The median SPAD readings in 'Amasya' were 32.63 and 26.23 for the flowering and nonflowering spurs, respectively, which were the relatively low values among studied cultivars. The maximum SPAD value was measured in flowering spurs of 'Cripps Pink' (45.03). SPAD values were found to be lower in non-flowering spurs compared with flowering ones for all the studied cultivars, which confirms that decline in chlorophyll content coincided with a gradual decline in productivity. A notably significantly lower spur leaf area was found in 'Amasya', whereas the highest spur leaf area was in 'Cripps Pink'. However, no statistical difference was observed between flowering and non-flowering spur leaf areas within the same cultivars. The present results provided a general framework of SPAD and spur leaf areas in 'Amasya' and other apple cultivars when spurs had flowers or not. Knowledge of these characteristics provides a basis for building a model related to yield elaboration of apple trees.

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Section: Resultssupporting

confidence: 48%

Section: Resultsmentioning

confidence: 92%

Flowering and Non-Flowering Spur Leaf Characteristics of 'Amasya' Apple and Its Comparison with Other Cultivars

Atay

2022

Horticultural Studies

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“…The CP descriptor was calculated by multiplying the nitrogen content by 6.25 ( Druzian et al, 2012 ; De Medeiros et al, 2015 ). The SPAD index was generated by the SPAD-502 chlorophyll meter (Soil Plant Analysis Development), which indirectly measures the leaf chlorophyll content without destroying the leaf ( D’Oliveira et al, 2020 ), and the chlorophyll concentration positively correlated with the nitrogen content ( Benati et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

et al. 2022

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The genus Paspalum belongs to the family Poaceae and has several species that are native to Brazil. The Paspalum Germplasm Bank (GB) of the Brazilian Agricultural Research Corporation comprises approximately 450 accessions from 50 species. Among these accessions, Paspalum atratum (BGP 308) has economic potential for forage purposes. However, the endophytic and rhizospheric microbial communities within this accession and their ability to promote plant growth remain unknown. The present study aimed to isolate the endophytic and rhizospheric bacteria associated with P. atratum and to assess their potential for plant growth improvement, so-called plant growth-promoting bacteria (PGPB). For the in vitro tests, the ability of nitrogen-fixing bacteria (NFB), phosphate solubilization (PS) and indoleacetic acid (IAA) production were evaluated. A total of 116 endophytic and rhizosphere bacteria were obtained from the isolation. In the in vitro tests, 43 (37.00%) of these isolates showed positive NFB, PS, and IAA results. These isolates were identified by 16S rDNA sequencing. The phosphate solubilization index (PSI) ranged from 2 to 3.61, all 43 strains performed biological nitrogen fixation and the IAA production ranged from 12.85 to 431.41 μg ml−1. Eight of these 43 isolates were evaluated in vivo in a greenhouse using P. atratum caryopsis. The pots were filled with soil prepared with three different phosphate sources and one control without phosphate. After growth, the plants were submitted to morphological, bromatological and chemical determination. Data were analyzed using analysis of variance (ANOVA) and principal component analysis (PCA). In the in vivo test, treatments 105 (Pseudomonas sp.) and 458 (Pseudomonas sp.) were the most significant for the crystalline phosphate source, 109 (Bacillus sp.) for the sedimentary phosphate source and, as for the soluble phosphate source most treatments that received bacterial isolates had higher phosphorus content in the dry matter than the uninoculated soluble phosphate control. The 105FCR (crystalline phosphate + Pseudomonas sp.), 109FSE (sedimentary phosphate + Bacillus sp.), and 110 FSE (sedimentary phosphate + Enterobacter sp.) treatments showed the best results for plant growth promotion. This work made it possible to determine the bacterial community associated with P. atratum (BGP308) and to obtain new potential plant growth-promoting strains.

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“…The growth variables plant height (PH) (using a graduated ruler) and number of leaflets (NL) were measured weekly, at 7, 14, 21, and 26 days after transplanting (DAT), in both cycles (Santos et al, 2022). At the end of each cycle (30 DAT), the SPAD chlorophyll index was determined using a portable meter (SPAD 502, Minolta Co, Ltd, Osaka, Japan) on the largest expanded blade (Benati et al, 2021). Subsequently, the plants were collected to obtain the leaf area (LA), measured with an area meter (Area meter, LI-3100, Li-Cor, Inc. Lincoln, NE, USA), with a value expressed in cm² plant -1 .…”

Section: Methodsmentioning

confidence: 99%

Hydroponic watercress production through fish farming water reuse and varied nutrient solution recirculation times

Oliveira,

Silva

et al. 2023

Rev. bras. eng. agríc. ambient.

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Aiming at a more sustainable food production, the reuse of effluent from fish farming in hydroponics can be a viable option. Thus, the objective of present study was to evaluate the effects of the use of effluent from fish farming on the development of ‘Folha Larga’ watercress and the possibility of reducing the use of fertilizer in a hydroponic system. The assay was carried out in a greenhouse from October 2021 to February 2022 (two cycles). The treatments were distributed in randomized blocks, with four replications, with split plots, consisting of two times of recirculation of the solution in the plots (T1 = 15 min operating by 15 min off and T2 = 15 min operating by 30 min off) and five solutions, in the subplots, obtained by mixing different proportions (0, 25, 50, 75, and 100%) of nutrient solution and effluent from fish farming. The variables analyzed were: plant height, number of leaflets, leaf area, SPAD index, fresh and dry weight of the aerial part and roots. The use of effluent from fish farming reduces the amount of fertilizers for the yield of ‘Folha Larga’ watercress. Nutrient solution recirculation time of 15 minutes is suitable for hydroponic watercress.

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Spad index for diagnosis of nitrogen status in ‘Esmeralda’ peach

Cited by 8 publications

References 16 publications

Flowering and Non-Flowering Spur Leaf Characteristics of 'Amasya' Apple and Its Comparison with Other Cultivars

Flowering and Non-Flowering Spur Leaf Characteristics of 'Amasya' Apple and Its Comparison with Other Cultivars

Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources

Hydroponic watercress production through fish farming water reuse and varied nutrient solution recirculation times

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