Response of Kentucky Bluegrass Turfgrass to Plant Growth Regulators

Efficient and affordable plant phenotyping methods are an essential response to global climatic pressures. This study demonstrates the continued potential of consumer-grade photography to capture plant phenotypic traits in turfgrass and derive new calculations. Yet the effects of image corrections on individual calculations are often unreported. Turfgrass lysimeters were photographed over 8 weeks using a custom lightbox and consumer-grade camera. Subsequent imagery was analyzed for area of cover, color metrics, and sensitivity to image corrections. Findings were compared to active spectral reflectance data and previously reported measurements of visual quality, productivity, and water use. Results confirm that Red–Green–Blue imagery effectively measures plant treatment effects. Notable correlations were observed for corrected imagery, including between yellow fractional area with human visual quality ratings (r = −0.89), dark green color index with clipping productivity (r = 0.61), and an index combination term with water use (r = −0.60). The calculation of green fractional area correlated with Normalized Difference Vegetation Index (r = 0.91), and its RED reflectance spectra (r = −0.87). A new chromatic ratio correlated with Normalized Difference Red-Edge index (r = 0.90) and its Red-Edge reflectance spectra (r = −0.74), while a new calculation correlated strongest to Near-Infrared (r = 0.90). Additionally, the combined index term significantly differentiated between the treatment effects of date, mowing height, deficit irrigation, and their interactions (p < 0.001). Sensitivity and statistical analyses of typical image file formats and corrections that included JPEG, TIFF, geometric lens distortion correction, and color correction were conducted. Findings highlight the need for more standardization in image corrections and to determine the biological relevance of the new image data calculations.

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Color Response of Turfgrass Cultivars to Gibberellic Acid under Mediterranean Climate Conditions

Kara,

Sürmen,

Metin

et al. 2024

TDFD

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Plant growth regulators (PGRs) are broadly used in turfgrass management. Gibberellic acid is also applied in many plants due to its positive effects on plant growth and development. However, some studies have indicated that these applications may have a negative effect on color. The study aimed to find out the effect of different doses of gibberellic acid applications on visual quality in different turfgrass species. Gibberellic acid was applied as control, 0.05 and 0.1 kg ha-1. Among the turfgrass species, twenty different cultivars of 4 different species were used as material in the experiment. Visual quality was assessed using a visual rating system. Color quality was examined using a spectrophotometer. In general, the use of gibberellic acid had negative effects on visual quality. Although there are studies showing that it increases resistance to stress conditions, visual quality is very important for turfgrasses. It was observed that grass species have different responses to gibberellic acid.

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Response of Kentucky Bluegrass Turfgrass to Plant Growth Regulators

Cited by 3 publications

References 39 publications

Enhancing Seasonal Growth and Quality of Kentucky Bluegrass (<i>Poa pratensis</i> L.) with Trinexapac-ethyl and Prohexadione-calcium

Enhancing Seasonal Growth and Quality of Kentucky Bluegrass (<i>Poa pratensis</i> L.) with Trinexapac-ethyl and Prohexadione-calcium

Visualizing Plant Responses: Novel Insights Possible Through Affordable Imaging Techniques in the Greenhouse

Color Response of Turfgrass Cultivars to Gibberellic Acid under Mediterranean Climate Conditions

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