A melancia ocupa lugar de destaque entre as principais olerícolas produzidas e consumidas no Brasil e, na olericultura, a produção de mudas em ambientes protegidos é a metodologia mais utilizada. O objetivo deste trabalho foi avaliar o desempenho dos cultivares de melancia "Crimson Sweet" e "Fairfax" na produção de mudas, em ambiente protegido, e de frutos, em condições de campo, na região do cerrado sul-mato-grossense. Na fase de mudas, o experimento foi conduzido em três ambientes protegidos. Cada ambiente foi considerado um experimento, conduzido no delineamento inteiramente casualizado, com seis repetições. Em seguida, realizou-se a análise conjunta. No campo, o delineamento utilizado foi o de blocos casualizados, com quatro repetições. Os dados foram submetidos à análise de variância e, as médias, ao teste de Tukey. As melhores mudas foram formadas na estufa plástica. O cultivar "Fairfax" apresentou mudas de melhor qualidade. No campo, os cultivares apresentaram frutos com diâmetros e biomassas similares.

Resumo -O objetivo deste trabalho foi avaliar a influência de diferentes espaçamentos entre plantas (12,5; 15,0; 17,5 e 20,0 cm) e tipos de cama de frango adicionadas ao solo (com bases maravalha e casca de arroz e sem cama de frango), na produtividade e rentabilidade do mangarito. Os tratamentos foram arranjados no esquema fatorial 4 x 3, no delineamento experimental blocos casualizados, com quatro repetições. As maiores produtividades foram obtidas sob o menor espaçamento (12,5 cm), apresentando valores máximos de 1,25 t ha -1 , para rizoma mãe e 4,20 t ha -1 , para rizoma filho comercializável, com aumentos de 0,59 e 2,78 t ha -1 , respectivamente, em relação ao espaçamento de 20 cm entre plantas. Os custos estimados para produzir 1,0 ha de mangarito variaram em R$ 1.619,06, entre o maior custo (R$ 9.917,36), para o cultivo sob espaçamento de 12,5 cm e o menor custo (R$ 8.298,30), sob espaçamento de 20 cm, sem a adição de cama de frango. Para se obter maior produtividade de rizomas comercializáveis e maiores renda bruta e líquida, o cultivo de mangarito deve ser feito no espaçamento de 12,5 cm entre plantas e com cama de frango com base de casca de arroz. Palavras-chave:Xanthosoma mafaffa, espaçamentos, adubação orgânica, renda.Abstract -The aim of this study was to evaluate the influence of different spacing arrangement between plants (12.5, 15.0, 17.5 and 20.0 cm) and types of broiler manure (with base residue shavings and rice hulls added in soil cover and without the addition of broiler manure), in the productivity and profitability of tannia. The treatments were arranged in a 4 x 3 factorial scheme, in a randomized complete block design, with four replications. The highest yields were obtained in the smallest spacing (12.5 cm), presenting maximum values of 1.25 t ha -1 , for the mother cormel and 4.20 t ha -1 , for commercial cormels, with increases of 0.59 and 2.78 t ha -1 , respectively, in relation to the spacing of 20 cm between plants, which was the one that obtained the lowest productive means. The costs estimated to produce 1.0 ha of tannia as a function of the treatments under study varied by R$ 1,619.06 between the highest cost (R$ 9,917.36), determined for cultivation in spacing of 12.5 cm and the lowest cost (R $ 8,298.30), for cultivation at 20 cm spacing without the addition of broiler manure to the soil. In order to obtain higher yields and higher gross and net income of commercial cormels of tannia, the cultivation should be done at a spacing of 12.5 cm between plants and with addition of broiler manure with of rice husk base residue.

The commercial part of the Peruvian carrot plant is subterraneous, requiring well-structured soils. Differences in seedling size and the use of organic residues may affect crop productivity and farmer income. This study aimed to assess the productivity and profitability of Peruvian carrot propagated using different seedling sizes (T1, T2, T3, and T4) and grown with broiler litter of different bedding materials (wood shavings and rice hull) as soil cover, arranged in a 4 × 2 factorial scheme in a randomized block design with five replicates. The highest production of fresh leaves (5.85 t ha-1), shoots (7.55 t ha-1), and commercial roots (6.30 t ha-1) were obtained with propagation using T2 seedlings. Broiler litter with wood shavings bedding provided the highest commercial root productivity (5.00 t ha-1

Demand for agricultural products with zero or reduced amounts of agrochemicals leads to increasingly healthy production alternatives. Thus, seedling formation and fruit yield of three cucumber cultivars were evaluated on different organic substrates in a protected environment. Marketer, Caipira and Verde Comprido cultivars were grown on five substrates: 100% cassava stems + 0% cattle manure; 75% cassava stems + 25% cattle manure; 50% cassava stems + 50% cattle manure; 25% cassava stems + 75% cattle manure and 0% cassava stems + 100% cattle manure. A completely randomized design in a 5 x 3 factorial scheme (5 substrates X 3 cultivars) was used, with six replications of four seedlings in the seedling formation phase and five replications of two plants in the fruit production phase. The seedlings were produced in trays with 72 cells, and fruit production was conducted in 13-liter pots. There was a little influence of the substrates on the emergence of cucumber cultivars: the substrates with 75 and 100% of cattle manure provided the best conditions for seedling formation, as well as the highest yield and the largest amount of fruits. On the best substrates, the cultivar Caipira had fruits with higher mass and larger average fruit diameter, but in smaller numbers.

Organic residue addition to soil is a recommended practice for arracacia production. This study was aimed at analyzing the agroeconomic productivity of arracacia cultivated with different doses (0, 5, 10, 15, and 20 Mg ha −1) and residue types in broiler manure (sawdust and rice hulls). From the arrangement in a 5 × 2 factorial scheme, ten treatments resulted, in a randomized complete block design with four replications. The highest leaf mass production was obtained with 11.2 Mg ha −1 of broiler manure. The use of broiler manure containing sawdust at 16 Mg ha −1 resulted in the highest shoot and root productivities. The maximum numbers of shoots were 649,500 ha −1 and 651,560 ha −1 , with 12.48 Mg ha −1 and 9.20 Mg ha −1 of broiler manure containing sawdust and rice hulls, respectively. The maximum number of marketable roots was obtained by using 11.77 Mg ha −1 and 12.21 Mg ha −1 of broiler manure containing sawdust and rice hulls, respectively. The costs per hectare varied by R$ 3,233.55 between the lowest and highest costs. It was concluded that the highest productivity of marketable arracacia roots was obtained with 16 Mg ha −1 of broiler manure containing sawdust. The highest gross and net incomes were obtained with 15 Mg ha −1 of broiler manure containing sawdust.