The aim of this work was to evaluate the initial growth of sweet pepper in different substrates and light environments. The experiment was conducted at the Federal University of Recôncavo da Bahia, in the municipality of Cruz das Almas, BA. The sowing was performed directly in 12 x 20 cm polyethylene bags and the design was completely randomized, in a 4x4 factorial scheme, with 4 replications. The substrates were: CC (commercial compound), SCC (soil (50%) + commercial compound (50%)), SV (soil (50%) + vermiculite (50%)) and SVH (soil (50%) + vermiculite (25%) + earthworm humus (25%)); and light environments: red ChromatiNet®, thermo-reflective screen (Aluminet®) and black screen (all with 50% shading) and full sun. The red screen provided higher values of height, stem dry mass, number of leaves, leaf area ratio, specific leaf area of sweet pepper seedlings; the black screen, in turn, provided higher values of root volume, leaf dry mass, stem diameter, total dry mass, root dry mass, Dickson quality index and leaf area. The quality of the seedlings produced on substrates CC and SCC was superior than that of seedlings grown on substrates SV and SVH. The treatments with screens and substrates CC and SCC favored the growth of sweet pepper seedlings.Additional keywords: Capsicum annuum L.; luminosity; shading screens. ResumoO objetivo deste trabalho foi avaliar o crescimento inicial do pimentão em diferentes substratos e ambientes de luz. O experimento foi conduzido na Universidade Federal do Recôncavo da Bahia, no município de Cruz das Almas-BA. A semeadura foi realizada diretamente em sacos de polietileno com 12 x 20 cm, foi utilizado o delineamento inteiramente casualizado, em esquema fatorial 4x4, com 4 repetições. Os substratos utilizados foram: CC (substrato comercial), substrato SCC (solo (50%) + substrato comercial (50%)), SV (solo (50%) + vermiculita (50%)) e SVH (solo (50%) + vermiculita (25%) + húmus de minhoca (25%)) e os ambientes de luz: malha vermelha ChromatiNet®, termorrefletora Aluminet® e preta (todas com 50% de sombreamento) e pleno sol. A malha vermelha proporcionou maiores valores de altura, massa seca do caule, número de folhas, razão de área foliar, área foliar específica das mudas de pimentão; já a malha preta proporcionou maiores valores de volume de raiz, massa seca da folha, diâmetro do caule, massa seca total, massa seca de raiz, índice de qualidade de Dickson e área foliar. A qualidade das mudas produzidas nos substratos CC e SCC foi melhor do que quando cultivadas nos substratos SV e SVH. Os tratamentos com malhas e os substratos CC e SCC favoreceram o crescimento das mudas de pimentão.Palavras-chave adicionais: Capsicum annuum L.; luminosidade; telas de sombreamento.
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