Este trabalho teve objetivo avaliar o efeito da adição de cama de frango (CF) e esterco bovino (EB) à fibra de coco (FC) na formulação de um substrato para produção de mudas de alface tipo americana. O experimento foi conduzido no município de Mossâmedes-GO, no período de outubro de 2016 a novembro de 2016. O cultivo foi conduzido em estufa coberta de PEBD translúcido. O experimento foi realizado em delineamento inteiramente casualizado, sendo sete tratamentos de substratos (100%FC; 90%FC + 10%EB; 80%FC + 20%EB; 60%FC + 40%EB; 90%FC + 10%CF; 80%FC + 20%CF; 60%FC + 40%CF) e 40 repetições. Foi realizada análise física e química dos sete substratos. Avaliou-se a porcentagem de emergência; a massa do sistema radicular e parte aérea no momento do transplantio. A fibra de coco pura, como substrato, e sem fertirrigação é inviável para a produção de mudas de alface. Os substratos formulados com 80% de fibra de coco + 20% de esterco bovino curtido e 60% de fibra de coco + 40% de esterco bovino curtido são adequados para produção de mudas de Alface. A cama de frango mostrou-se uma fonte muito salina, mesmo curtida, comprometendo a emergência e desenvolvimento das mudas.Palavras chaves: Ambiente protegido, Lactuca sativa, salinidade Development of lettuce changes in the function of alternative substratesABSTRACT. This work had the objective of evaluating the effect of the addition of chicken litter and bovine manure to the coconut fiber in the formulation of a substrate for the production of Lucy Brown American lettuce seedlings. The experiment was conducted in the municipality of Mossâmedes-GO, from October 2016 to November 2016. The cultivation was conducted in a greenhouse covered with translucent LDPE. The experiment was performed in a completely randomized design, with seven treatments of substrates (100% FC, 90% FC + 10% EB, 80% FC + 20% EB, 60% FC + 40% EB, 90% FC + 10% CF 80% FC + 20% CF, 60% FC + 40% CF) and 40 replicates. Physical and chemical analysis of seven substrates were performed. The percentage of germination was evaluated; The mass of the root system and aerial part at the time of transplanting. It was concluded that: pure coconut fiber without fertigation is not feasible for the production of lettuce seedlings; The substrates formulated with 80% coconut fiber + 20% tanned bovine manure and 60% coconut fiber + 40% tanned bovine manure are suitable for production of lettuce seedlings; The chicken bed showed to be a very saline material, even tanned, compromising the germination and development of the seedlings.
The study aimed to evaluate two irrigation scheduling techniques for hydroponic tomato production in Ceará, northeastern Brazil. The experiment was set up as a split-plot randomized block design, with six replications. As main factor, two irrigation scheduling techniques were tested: (a) Automatic scheduling using matric sensors, a closed loop irrigation control system based on the Irrigas ® sensor, was used to start irrigation whenever matric potential in the substrate reached-4 kPa. (b) Time clock scheduling-irrigation applications were programmed at fixed intervals and rates, according to drainage fraction observed on the previous day and water retention capacity of the substrate. Tomato hybrids 'Miramar' and 'Ellen' were evaluated in the subplots. The growing medium was coconut fiber in bags of 40 L. The automatic irrigation scheduling based on Irrigas ® sensors did not affect significantly the tomato marketable yield, fruit weight, and number of fruits per plant (p>0.05) as compared to time clock scheduling. The automatic irrigation control reduced water application by 6.3% as compared to time clock scheduling, without affecting pH and EC levels of the drainage solution. The tomato hybrid 'Miramar' presented significantly higher (p<0.01) marketable yield and number of fruits per plant than hybrid 'Ellen', which presented higher fruit weight.
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