RESUMO Estudos relacionados ao aproveitamento de resíduos agrícolas tornaram-se imprescindíveis pela possibilidade de seu uso na produção de mudas de olerícolas e por minimizar o risco de contaminação ambiental decorrente do descarte inadequado. O objetivo do trabalho foi avaliar o crescimento de mudas de tomateiro produzidas em substratos compostos por fibra de coco, casca de ovo e com níveis crescentes de moinha em substituição ao substrato comercial Bioplant. As composições dos substratos testados foram: T0= substrato comercial; T1= 15% de moinha (MO: resíduo da secagem dos grãos de café) + 15% fibra de coco (FC) + 5% casca de ovo (CO) + 65% substrato comercial (SC); T2= 30% MO+ 15% FC + 5% CO+ 50% SC; T3= 45% MO+ 15% FC + 5% CO + 35% SC; T4= 60% MO + 15% FC + 5% CO + 20% SC. Número de folhas, altura de plântula, diâmetro de caule, massa fresca e seca da parte aérea, de raiz e da planta inteira foram avaliados. Os substratos alternativos contendo de 15 a 32% de moinha + 15% fibra de coco + 5% casca de ovo + 48% a 65% de substrato comercial proporcionam os maiores valores de todas as variáveis analisadas. Todas as proporções de moinha estudadas promovem valores das variáveis de crescimento superiores àqueles obtidos quando se usa somente o substrato comercial. O uso de 5% casca de ovo, 15% de fibra de coco, 15 a 32% de moinha e 48 a 65% de substrato comercial é uma alternativa de substrato para produção de mudas de tomate, permitindo um adequado destino a esses resíduos agrícolas.
The objective of this study was to evaluate the growth variables of eggplants seedlings produced in substrates with different compositions in agricultural residues. The experiment was carried out in a completely randomized design, with five treatments and ten replicates, with the following treatments: T0= Bioplant commercial substrate (control); T1= 10% of moinha (dried residue of coffee beans) + 15% of coconut fiber + 5% of eggshell + 70% of commercial substrate; T2= 20% of moinha + 15% of coconut fiber + 5% of eggshell + 60% of commercial substrate; T3= 30% of moinha + 15% of coconut fiber + 5% of eggshell + 50% of commercial substrate; T4= 40% of moinha+ 15% of coconut fiber + 5% of eggshell + 40% of commercial substrate. The evaluated variables were electric conductivity of the substrate, number of leaves, plant height, stem diameter; and fresh and dry biomass of shoot, root, and of the whole plant. Growing doses of moinha provide increased electrical conductivity in substrate. The treatment groups containing increasing proportions of moinha in the substrate composition present the highest values of growth variables in relation to the commercial substrate. Except shoot, root and total dry biomass, the substrate with 10 and 20% of moinha have the highest values of analyzed variables in eggplant seedlings.
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