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Libertad Mascarini, Gabriel A. Lorenzo, and Fernando Vilella

In roses (Rosa ×hybrida L.), the bending of branches is a technique that modifies the canopy of the plant and could affect such parameters as the leaf area index (LAI), the quality of reflected light, and the water index (WI) of the plant. The measurement of spectral reflectance with remote sensors is a nondestructive, quick, and simple method to study these parameters. The aim of this paper is to quantify the modification of reflected radiation quality, the LAI and the water index of the plant with different canopies, and its impact on flowering and the number and quality of flowers produced. In R. ×hybrida `Terracotta', using the spectral crop reflectance, the red: far red ratio [red (R) = 680 nm; far red (FR) = 730 nm], percentage of blue light of reflected radiation, and vegetation indices [normalized difference vegetation index (NDVI), simple ratio index (SRI), water index (WI)] were calculated in two architectural managements: traditional (upright hedge) and bent shoot. NDVI had a greater correlation with LAI than SRI (r2 = 0.98 and 0.85, respectively), but SRI was more reliable for LAI values of 1 to 3.5. The bent shoot system compared to the traditional one decreased the R:FR ratio of reflected radiation and increased LAI and plant water content. These changes were related to a higher commercial quality of the flowers (longer flowering shoots with a larger stem diameter and fresh weight), although there was no significant difference in the number of flowers harvested. The period that showed the largest difference in the quality of the flower using the bent shoot system had a LAI of 2.8 vs. 1.8 with traditional management and a marked reduction in the R:FR of the light reflected by bent plants. The bent shoot system advanced the peak production by 1 month at the end of winter and improved the flowers at a time when sun radiation is limiting factor for production.

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Katherine Bennett, Mary Vargo, Guido Schnabel, and James E. Faust

institucional UN, Universidad Nacional de Colombia Baas, R. Marissen, N. Dik, A. 2000 Cut rose quality as affected by calcium supply and translocation Acta Hort. 518 45 54 Bennett, K. 2019 The effect of calcium on Botrytis blight of petunia flowers. MS Thesis

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Katherine Bennett, Jared Jent, Uttara C. Samarakoon, Guido Schnabel, and James E. Faust

number of fungicide applications and thus reduce the selection pressure for fungicide resistance. Literature Cited Baas, R. Marissen, N. Dik, A. 2000 Cut rose quality as affected by calcium supply and translocation Acta Hort. 518 45 54 Barrett, J.E. Nell

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Iftikhar Ahmad, John M. Dole, M. Aslam Khan, M. Qasim, Tanveer Ahmad, and A.S. Khan

-quality handling techniques due to lack of capital facilities, human resource development, and poor infrastructure, resulting in the lack of a cool chain system for preserving cut rose quality. Consequently, producers rely on traditional agro-based techniques for

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Benjamin Paskus, Patrick Abeli, and Randolph Beaudry

cut rose quality relative to high-humidity storage at atmospheric pressure and normoxia. Materials and Methods Design of the LPS system. A laboratory LPS system was built according to Burg (2004) consisting of a vacuum pump, a vacuum