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- W2762654944 abstract "The aim of the work was to evaluate the growth and productivity of lettuce cultivars cultivated in greenhouse with and without thermo-reflective screens. The experiment was conducted in greenhouse in Assis Chateaubriand, Parana State. The experimental design was in a randomized block design with six replications and treatments arranged in a 2 x 4 factorial. The first factor consisted of culture environments (with and without thermo-reflective screens 50%) and the second of four cultivars of lettuce (Itapua, Paola, Vera and Veronica). Five samples were performed weekly for evaluation of dry matter and leaf area used to obtain the absolute and relative growth rates, net assimilation rates, leaf area ratio and specific leaf area. At the last evaluation were also determined: plant height, leaf number, canopy diameter, leaf and shoot fresh matter and productivity. The use of the thermo-reflective screens interfered the development of lettuce promoting reduction in growth rates and the accumulation of fresh matter. The Paola cultivar did not present a good performance in the conditions of study. The use of thermo-reflective screens reduced the productivity of lettuce by 19% and did not correspond to the expected improvement on crop yield." @default.
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- W2762654944 date "2017-07-14" @default.
- W2762654944 modified "2023-10-17" @default.
- W2762654944 title "Growth and productivity of lettuce cultivars under protected environment with and without thermal reflector screen" @default.
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