ABSTRACT Effluent from fish farming with saline water is a source of water, also rich in organic matter and nutrients, that can be used in irrigation of cultivated plants and even fully or partially replace mineral fertilization. The objective was to evaluate the growth, biomass production and quality of P. maximum cultivars fertigated with fish farming effluent in a greenhouse experiment, using a randomized block design with eight replicates. Treatments were arranged in a split-split-plot scheme, with three irrigation managements in the plot (irrigation with public-supply water, irrigation with public-supply water + conventional fertilization, and irrigation with fish farming effluent), three cultivars of P. maximum (Tanzania, Mombasa, and Massai) in the sub-plot, and four cutting times in the sub-sub-plot (45, 90, 135, and 180 days after sowing). Plant height, number of tillers, production of fresh biomass, neutral detergent fiber, acid detergent fiber, ether extract, crude protein, dry matter, and mineral matter contents were analyzed. The highest growth, production, and quality of P. maximum grass occurs when irrigated with public-supply water and under conventional NPK fertilization. Fertigation with fish farming effluent reduces the growth and production of P. maximum grass, but allows obtaining better quality forage. It is possible to irrigate P. maximum grass using fish farming effluent with satisfactory yields. The growth of cv. Massai was more sensitive to irrigation with fish farming effluent than those of the cultivars Tanzania and Mombasa. nutrients fertilization P experiment replicates splitsplitplot split scheme publicsupply public supply effluent, , effluent) Tanzania, (Tanzania Mombasa subplot, subplot sub plot, sub-plot subsubplot 45, 45 (45 90 135 18 sowing. sowing . sowing) height tillers fiber extract protein analyzed forage yields cv 4 (4 9 13 1 (

Resumo A compostagem é uma alternativa para reciclagem de resíduos orgânicos biodegradáveis, transformando-os em adubo orgânico que podem ser utilizados como aporte de nutrientes para fins agrícolas, evitando sua deposição em aterros sanitários. O objetivo do presente estudo foi avaliar a compostagem de resíduo orgânico doméstico em substituição ao esterco de bovino, com vista a sua aplicação na adubação do tomateiro cereja (Solanum lycopersicum Mill., var. cesariforme). Nesse sentido, foram construídas pilhas de compostagem com 30% de resíduos orgânicos (fonte de carbono) e 70% resíduos de podas de árvores (material de enchimento). Foram testadas duas fontes de resíduo orgânico: resíduos alimentares de origem doméstica (FW) e esterco bovino (CM), em cinco proporções (15% FW + 15% CM, 10% FW + 20% CM, 20% FW + 10% CM e os controles 30% CM e 30% FW). Após 90 dias, o composto maturado de cada pilha foi misturado com substrato de fibra de coco na proporção de 1:1 e acondicionado em vasos plásticos de 15 L, onde as plantas de tomateiro cereja foram cultivadas. O experimento foi conduzido em casa de vegetação utilizando o delineamento experimental de blocos casualizados, com cinco tratamentos e cinco repetições. Foram realizadas avaliações de crescimento e composição mineral do tecido foliar do tomateiro cereja. Os resultados indicam que o esterco bovino pode ser substituído por resíduos alimentares como material orgânico para construção das pilhas de compostos. A adubação com composto orgânico oriundo de resíduos alimentares influenciou positivamente no crescimento e assimilação dos nutrientes no tecido foliar do tomateiro cereja.

Abstract Composting is an alternative for recycling biodegradable organic waste, transforming it into organic fertilizer that can be used as agricultural nutrients, avoiding its disposal in landfills. This study evaluated the composting of household organic waste as a substitution for cattle manure, with a view to its application in the fertilization of cherry tomatoes (Solanum lycopersicum Mill., Var. Cesariforme). Thus, compost piles were set up using 30% organic waste (carbon source) and 70% tree-pruning residues (filling material). Two sources of organic waste were tested: household food waste (FW) and cattle manure (CM), at five proportions (15% FW + 15% CM, 10% FW + 20% CM, 20% FW + 10% CM and the controls 30% CM and 30% FW). After 90 days, the mature compost from each pile was mixed with coconut fibre in a 1:1 ratio and used as substrate filled in 15 L plastic pots, where the cherry tomato plants were grown. The experiment was conducted under greenhouse conditions in a randomized block design, with five treatments and five replicates. Assessments of growth and leaf mineral composition were performed for the cherry tomato plants. The results indicate that cattle manure can be replaced by household food waste as the organic material used in compost piles. Fertilization with organic compost from household food waste positively influenced the growth and nutrient assimilation in the leaf tissue of cherry tomato.