Abstract
Shading screens are widely used to control excessive solar radiation, thereby changing plant growth. Thus, through physiological indices the objective was to evaluate the growth of three cultivars of minitomatoes under colored meshes. The experiment was conducted from April to July in the DTCS / UNEB experimental field in experiment DBC with subdivided plots, and four replicates, comprised of three shaded environments and the control treatment, three cultivars, and seven plant sampling seasons. For growth analysis, we used the destructive method, total dry matter was determined after drying it in an oven at 65°C. The total leaf area (LAI) was obtained using the software QUANT. Results showed that there was no interaction between environments and the other factors. Regarding leaf area index, cvs. Shani and Sweet Million stood out in all environments, whereas cv. Red Sugar had a similar behavior in all environments. Shani obtained the best indices in open sun environment and in the environment covered with red shading screen, and Sweet Million obtained the best index under gray shading screen. Red Sugar had the lowest LAI, and consequently, the lowest SLA and LAR. On the other hand, it showed the highest RPF, since it obtained the highest dry matter in leaves compared to the other cultivars. Cvs. Shani and Sweet Million showed the best: TAL, TCR, TCA and TCC.
Highlights
Tomato (Solanum lycopersicum) belongs to the Solanaceae family, and in botanical terms, it is divided into two subgenera according to fruit color
Global solar radiation transmittance of the different environments tested had the following values: the highest value was observed in the environment covered with red shading screen
While global solar radiation under open sun reached a total of 1342.5 MJ.m-2 during the experiment, it reached 1192.8 MJ.m-2 under red shading screen, 996.1 MJ.m-2 under blue shading screen, and 699.7 MJ.m-2 under gray shading screen
Summary
Tomato (Solanum lycopersicum) belongs to the Solanaceae family, and in botanical terms, it is divided into two subgenera according to fruit color. Tomatoes that belong to subgenus Eriopersicon have green, yellow, or whitish fruits; on the other hand, tomatoes belonging to subgenus Eulycopersicon have reddish colored fruits - which is the case of commercially produced tomato (ALVARENGA, 2013). This fresh market tomatois generally consumed in natura and is considered a gourmet product, mainly because it is found in refined dishes and due to its multiple uses. Tomato is a vegetable with great economic importance in Brazil, which currently ranks the eighth position in terms of global production It is cultivated in an area of approximately 55.98 thousand hectares, where over 3.86 million tons of tomatoes are produced. It has a great socio-economic importance for the region; Bahia and Pernambuco together are responsible for 50% of the total Northeastern production, i.e., approximately 294.1 thousand t/year (IBGE, 2019)
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