O sorgo sacarino tem se destacado dentre as culturas bioenergéticas, e a torta de filtro frequentemente tem sido utilizada como biofertilizante, devido seu alto potencial nutritivo para as plantas. Neste contexto, estre trabalho teve como objetivo avaliar o efeito da aplicação de diferentes doses de torta de filtro sob as características de altura de plantas, diâmetro de colmo e produtividade de cultivares de sorgo sacarino. O delineamento experimental empregado foi o de blocos casualizados em esquema fatorial 5x2, com 4 blocos, sendo cinco doses de torta de filtro: 0, 15, 30, 45, 60 t ha -1 e duas cultivares comerciais de sorgo sacarino (CVSW 80007 e BRS 506), totalizando 40 parcelas experimentais. Os dados coletados foram submetidos à análise de variância associada ao teste de F a 5% de probabilidade. Para comparação entre as cultivares utilizou-se o teste de Tukey e para fator doses de torta de filtro a análise de regressão foi empregada. Todas características das cultivares de sorgo sacarino estudadas foram influenciadas pela aplicação de doses de torta de filtro e pela cultivar. A cultivar BRS 506 apresentou melhor desempenho agronômico quando comparada à CVSW 80007. Para todas as características estudadas a cultivar BRS 506 apresentou comportamento linear crescente em função das doses de torta de filtro aplicadas. Já a cultivar CVSW 80007 apresentou resposta quadrática para produtividade de massa verde, com dose ótima de torta de filtro de 44,74 t ha -1 , e, também para altura de plantas, cuja dose ótima foi de 41,25 t ha -1 .
The cultivation of sorghum for silage production has gained more space each year because of its satisfactory nutritional characteristics, resistance to water deficit and adaptability to various types of soil. Thus, the use of sorghum silage has been an alternative for periods of low forage production, providing quality food for ruminants. In this context, the objective was to evaluate the fermentation parameters and quality of sweet and biomass sorghum silages added with doses of vinasse. The experiment was a 2 x 5 factorial completely randomized design with three replications of two sorghum species (sweet and biomass) and five doses of vinasse applied to the soil: 0; 50; 100; 150 and 200 m3 ha-1, totaling 30 experimental silos. For silage, sorghum species were harvested in the 105-day cycle, with 30.5 and 32.3 g kg-1 dry matter, for biomass and sweet sorghum, respectively. The results showed that the biomass sorghum silage showed higher dry mass production. However, the sweet sorghum silage presented a lower buffering capacity, NH3-N, and higher concentration of lactic acid. Doses of vinasse increased the content of crude protein, in vitro digestibility of dry matter and ether extract and reduced fiber fractions in both sorghum species, showing that both species can be used for silage production. Vinasse is a promising alternative to organic fertilizer, since the use of 200 m3 ha-1 positively influenced the fermentation parameters and nutritional value of the sorghum silages.
The cultivation of lettuce in a hydroponic system is an alternative to optimize the production. Lettuce is an important food, being one of the most consumed vegetables in Brazil. The objective of this study was to evaluate the agronomic behavior of commercial cultivars of lettuce under a single nutritive solution in a hydroponic system. The experiment was carried out under greenhouse conditions. The experimental design was completely randomized, with five replicates. The treatments were composed of commercial lettuce cultivars (Americana Great Lakes, Rafaela-Americana, and Simpson Black Seed). At the time of harvest, the following parameters were evaluated: number of leaves, length of leaves and roots, fresh mass of shoot and root, and stem diameter. The collected data were submitted to an ANOVA. The cv. Rafaela-Americana presented higher leaf length. The evaluated cultivars did not present significant differences in the number of leaves, aerial green mass, green root mass, root length, and stem diameter. The cultivars showed similar variations in the number of leaves, aerial green mass, green root mass, root length, and stem diameter. The cultivar Rafaela-Americana presented a superior performance in the development of leaf length regarding the other cultivars.
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