Assessing the Effects of Nutrient Stress on the Red to Far-Red Ratios of Light Transmitted by Unifacial Plant Leaves

Baranoski, Gladimir V. G.

doi:10.1109/igarss39084.2020.9324362

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…21,22 For many weed species, the breaking of seed dormancy tends to be inhibited by low R/F R ratios and stimulated by relatively high R/F R ratios. 23,24 Again, if the observed connection between the REP and the R/F R ratios of light propagated by groups of soybean leaves with markedly distinct chlorophyll contents can be statistically confirmed, significant variations in the plants' REP can also be used to provide additional supporting data for weed management strategies. 22 The ramifications of our preliminary findings may be also extended to intercropping cultivation systems.…”

Section: Resultsmentioning

confidence: 98%

“…3 However, intercropped/partner species tend to affect each other's light exposure conditions in ways that may be adverse to those purposes. 25 For instance, it has been pointed out through predictive simulations supported by measured data 24 that the R/F R ratios of light propagated by corn leaves increase as their chlorophyll contents decrease, notably as a result of nutrient stress. Thus, light propagated by chlorophyll-depleted corn leaves may exacerbate the reduction of shade avoidance responses of neighbour soybean plants under nutrient stress.…”

Section: Resultsmentioning

confidence: 99%

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Insights into entangled variations in the red edge position and red to far-red ratios of soybean leaves

Baranoski

2023

Remote Sensing for Agriculture, Ecosystems, and Hydrology XXV

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Protein-rich soybean crops have a strategic importance for food production worldwide. Initiatives to increase their yield without compromising the environment include the use of remote sensing technologies to monitor their cultivation using spectral data. The red edge position (REP) is among the most used spectrally-derived information in this area. It is strongly correlated to the plants' chlorophyll contents and it can provide a reliable indication of changes in their nutrient status. Besides the availability of nutrients, the plants' photosynthetic capacity is also affected by other abiotic factors, notably light exposure. Variations in the red to far-red (R/FR) ratios of light impinging on soybean leaves are believed to trigger shade-avoidance responses that contribute to their photosynthetic efficiency. To date, the extent of possible connections between variations in the REP and R/FR ratios of soybean leaves remains unclear. In this paper, we address this open question using available measured spectral reflectance and transmittance data obtained for two groups of soybean specimens characterized by distinct chlorophyll contents. More specifically, we examine the impact that their distinct pigmentation levels have on their respective REP and R/FR ratios. The potential ramifications of our findings include not only the enhancement of the procedures employed in the monitoring and management of soybean crops through the combined use of these indices, but also the strengthening of the current knowledge about the intertwined physiological processes responsible for these plants' highly adaptive photosynthetic apparatus.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Insights into entangled variations in the red edge position and red to far-red ratios of soybean leaves

Baranoski

2023

Remote Sensing for Agriculture, Ecosystems, and Hydrology XXV

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show abstract

“…To achieve that, we gathered measured reflectance data available for these plants in the literature. We then used these data to compute spectral features, namely the red edge position (REP ) 16 and the red to far-red ratio (R/F R), 17 often employed in the assessment of these plant's capabilities to cope with stress factors. 5,7,[18][19][20][21] The comparisons of the computed parameters are not meant to be exhaustive, especially considering the data scarcity problem highlighted earlier.…”

Section: Introductionmentioning

confidence: 99%

Foliar spectral responses of sugarcane and maize: how comparable are they?

Baranoski

2023

Remote Sensing for Agriculture, Ecosystems, and Hydrology XXV

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Sugarcane and maize (corn) crops are extensively used in the production of biofuel worldwide. These plants share important physiological and morphological traits. Both belong to the group of C4 species characterized by the presence of unifacial leaves. Moreover, their stress adaptation mechanisms make them less susceptible to adverse conditions elicited by climate changes. Given these aspects and their economical value, one would expect that there is no shortage of data for these plants, particularly with respect to their foliar spectral responses. After all, such data is essential for the efficacy of precision farming and remote sensing strategies devised to obtain an ecologically sustainable increase in the yield of these crops. However, this is not the case, with the data scarcity situation being markedly more serious for sugarcane. Because of that, and considering their physiological and morphological similarities, investigations on the spectral responses of C4 plants are usually conducted using data obtained from maize specimens, with the resulting findings often being implicitly extended to sugarcane. This raises the question of whether the level of comparability between the foliar spectral responses of these two species is sufficient to support such an approach. In this paper, we aim to contribute to the elucidation of this question. Using measured reflectance data obtained for maize and sugarcane leaves, we compute selected spectral features associated with these specimens, and assess possible discrepancy trends. We then discuss data availability issues in this area, and identify relevant topics for future research that will likely require comprehensive measured spectral datasets for these plants.

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Assessing the Effects of Nutrient Stress on the Red to Far-Red Ratios of Light Transmitted by Unifacial Plant Leaves

Cited by 2 publications

References 20 publications

Insights into entangled variations in the red edge position and red to far-red ratios of soybean leaves

Insights into entangled variations in the red edge position and red to far-red ratios of soybean leaves

Foliar spectral responses of sugarcane and maize: how comparable are they?

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