Sunspots are Correlated with Foliar pH in Grapevines

Masoero, G.; Cugnetto, Alberto; Sarasso, Giuseppe; Giovannetti, Giusto; Nuti, Marco

doi:10.14302/issn.2639-3166.jar-19-3116

Cited by 5 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If it is common practice to refer to the Earth as a mother, but let us not forget that the Sun is the father of life on earth, and it cyclically affects the foliar pH of vines 28 , probably through UV variations 29 , an important characteristic of the leaves that has not been considered so far, but a link with productivity, that is, more than five kg per plant per pH unity decrease, has been demonstrated in the present work.…”

supporting

confidence: 54%

“…However, this app cannot be used for horizontal training systems (as for the pergola system) and for this reason the Erbaluce plants were excluded. an NIR-SCiO TM smart device, as described in Masoero et al 18 , with two replicates for each leaf. The foliar pH data were analyzed, according to a bifactorial linear model, with vine and vineyards within vine as the fixed effects.…”

Section: Canopy Architecture Determinationsmentioning

confidence: 99%

See 1 more Smart Citation

Vineyard Clusters Monitored by Means of Litterbag-NIRS and Foliar-NIRS Spectroscopic Methods

Cugnetto¹,

Lajolo²,

Vitaloni³

et al. 2021

JAR

Self Cite

View full text Add to dashboard Cite

There is currently a lack of rapid indirect analysis methods for the assessment of the effects of soil microbiota on vine production. Fifteen clusters of two Nebbiolo and Erbaluce varieties were identified in five vineyards belonging to a cooperative of winemakers in North West Italy, according to the differences in the NDVI index, as monitored by the Crop Monitoring OES system. The vineyards were surveyed in 2019 and the experimental monitoring of 75 vines was conducted in 2020. The first indirect method (Litterbag-NIRS) involved examining hay litterbags with a smart SCiOTM device. The average litterbag-NIR spectra of the clusters, as far as the yield is concerned, were closely fitted with the measured production yield, with an R2 cross-validated value of 0.91 in the Nebbiolo vines and 0.67 in the Erbaluce vines. The results in yield were accounted for by considering a few dominant variables in both vines, namely the microbic respiration of the soil and the crude protein of the litterbag (positive), opposed to the soil NO3--N and litterbag ADF (negative). The pruning wood was also closely correlated to the litterbag spectra. A second rapid method, foliar pH coupled with the NIR spectroscopy of the leaves, was then performed. The overall results predicted from the foliar NIRS were 0.73 for yield and 0.79 for the Canopy Cover. However, the most interesting result concerned the yield regressions on the foliar pH, which were clearly negative in both vines and of a similar amount: -5.15 kg/pH in Nebbiolo (R2 0.68) and -5.63 kg/pH (R2 0.23) in Erbaluce. Litterbag-NIRS, which shows a high predictive capacity, and foliar pH - with or without foliar-NIRS - are indirect and frugal methods that can be recommended for a rational assessment of the microbial soil fertility of vineyards.

show abstract

supporting

confidence: 54%

Section: Canopy Architecture Determinationsmentioning

confidence: 99%

Vineyard Clusters Monitored by Means of Litterbag-NIRS and Foliar-NIRS Spectroscopic Methods

Cugnetto¹,

Lajolo²,

Vitaloni³

et al. 2021

JAR

Self Cite

View full text Add to dashboard Cite

show abstract

“…A progressive decrease in foliar pH, which is correlated with the number of sunspots during the second (descending) phase of the 24 th cycle, has been highlighted in a multi-year study on vine 1 . It has been hypothesized, in studies on the cycles of forest moth pest species 2 , that such a decrease was due to an excess of UVB radiation, which is counter-correlated with the number of sunspots and is measured through the relationship with Ozone, as detected by means of TOMS 3 .…”

Section: Introductionmentioning

confidence: 90%

“…In fact, on the basis of a critical review of the phytopathological pandemics historically recorded during the 24 th solar cycles 1 , it appears that, in 22 out of 25 cases, the sunspots were in a position below the average position of the cycle for the year in which the pandemic event exploded. Considering the result observed on vine, and extrapolating it to the past, this finding suggests that the pH of the plants is tending toward an acid phase, enriched with energy and protons and -in a certain as yet not defined way -favorable for the spread of parasites, which could result in their prevalence.…”

Section: Introductionmentioning

confidence: 99%

UV rays Decrease Foliar pH in Cress (Lepidium Sativum) and Modify NIR Spectrum

Masoero¹,

Cugnetto²,

Sarasso³

et al. 2020

JAR

Self Cite

View full text Add to dashboard Cite

An experiment on watercress (Lepidium sativum) 42 d days after sowing was set up to evaluate the effect of UVAB radiation on foliar pH and on NIR tomoscopy. The effect of 8 h of UV exposure (about 500 µWcm-2) was clear, causing a reduction in the foliar pH of 6.0%, compared to the contemporary control group (5.22 vs. 5.56). When the treated leaves were returned to white light, their pH rose by 1.7% (5.31), reaching the same level as leaves grown outdoors (5.33). On the basis of the NIR spectra, the leaves of the plants grown outdoors were recognized 100%, that is, more than the control leaves (87%) and the plants treated with UV on the day of measurement (81%). However, the effect of the UV marking on the leaves is not permanent as, after the UV treatment, the leaves returned to white light were classified at 61%, which is a greater value than the 37% of overlapping between the two groups. The foliar pH was highly correlated with the NIR spectra, with R2 0.43. These results corroborate the hypothesis of the influence of the solar cycle on the variation of the pH of leaves in plants, which we believe may have played a major role in past agricultural pandemics. These results call for the introduction of the pH test for the evaluation of resistance to pathogens. From the environmental point of view, the foliar pH could be enlisted as an in vivo long-time indicator of the response of plants to climate changes.

show abstract

“…Average values above 6.0 were obtained for all the cultivars evaluated, which were in the same group, except for Mônica. This variable affects the digestibility of the leaves of some species; therefore, the higher the pH, the greater the digestion of the leaf material and free sugar content (Masoero et al, 2019). In contrast, under lower pH conditions, leaves tend to accumulate more water, lignin, cellulose, hemicellulose, and crude fibers (Masoero et al, 2019).…”

Section: /8mentioning

confidence: 99%

Morphophysiology and postharvest quality of hydroponic lettuce cultivars grown under high temperature

Bittencourt,

Silva Júnior,

Sampaio

et al. 2024

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

Lettuce (Lactuca sativa) is the most economically important leafy vegetable in Brazil, with the crisp type being the most popular among producers. However, in regions with hot climates, lettuce has production limitations due to bolting, requiring knowledge on the behavior of cultivars available on the market. Thus, the objective of the present study was to characterize the performance of crisp lettuce cultivars in terms of their productive, physiological, and postharvest quality aspects when grown under hydroponic cultivation and high temperature conditions. The assay was performed in a greenhouse and the plants were grown in a hydroponic system of DFT type. The average temperature during the experiment was 30.33 °C. The experimental design used was completely randomized with nine treatments (Veneranda, Cristina, Olinda, Mônica, Cinderela, Grand Rapids, Itapuã Super, Crocantela, and Simpson Black Seed), with four replications. The cultivars were analyzed in terms of their productive, physiological, and postharvest quality performances. The Olinda and Cristina cultivars showed the best performance in growth, physiological, and postharvest variables. However, the cultivars had distinct sensory characteristics. Bolting negatively affected gas exchange, production, and postharvest quality of lettuce cultivars Veneranda, Mônica, Grand Rapids, and Cinderela. In addition, it was observed that the pigment content was not determinant for the expression of bolting. Therefore, this study recommends the use of cultivars Olinda and Cristina for the hydroponic cultivation under high temperature conditions.

show abstract

Sunspots are Correlated with Foliar pH in Grapevines

Cited by 5 publications

References 11 publications

Vineyard Clusters Monitored by Means of Litterbag-NIRS and Foliar-NIRS Spectroscopic Methods

Vineyard Clusters Monitored by Means of Litterbag-NIRS and Foliar-NIRS Spectroscopic Methods

UV rays Decrease Foliar pH in Cress (Lepidium Sativum) and Modify NIR Spectrum

Morphophysiology and postharvest quality of hydroponic lettuce cultivars grown under high temperature

Contact Info

Product

Resources

About