The objective of this study was to compare rehydrated corn grain silages using water or whey and inoculated (Lactobacillus plantarum and Propionibacterium acidipropionici) or not. We also verified whether rehydration with whey associated with the bacterial inoculant improves material conservation. The treatments were as follows: silages rehydrated with water without inoculant (SWa); silages rehydrated with water and inoculated (SWaI); silages rehydrated with whey without inoculant (SWe); silages rehydrated with whey and inoculated (SWeI). A completely randomized design was used, with three replications, treatments in a 2 × 2 factorial scheme (RE: rehydration with water or whey, and IN: inoculation or addition of water without chlorine), during the following storage periods (T): 0, 4, 8, 16, 32, and 64 days. There was an RE x IN x T interaction (P < 0.001) for dry matter (DM), with lower values over time for SWe and higher values in SWeI. An interaction between RE x IN (P < 0.001) and IN x T (P < 0.001) was observed for pH, with higher values for SWe at 64 days of storage and a reduction from the first days of ensiling for SWaI and SWeI. The microbiological variables showed an RE x IN x T interaction (P < 0.001), with the highest counts of lactic acid bacteria for SWaI and SWeI up to 8 days of storage and subsequent higher counts in SWa and SWe. Higher counts were obtained in SWe. For the variables of fermentative losses, there was an RE x IN x T interaction (P < 0.001), with SWeI showing lower losses. The inoculation associated with whey for rehydration of corn grain improved the fermentation profile of the silage, with lower pH values and reduced losses.
A adubação nitrogenada possibilita aumentar a capacidade de suporte das pastagens, entretanto, o uso de elevadas doses pode causar efeitos negativos no crescimento de gramíneas forrageiras. A partir do pressuposto, objetivou-se avaliar a influência de doses crescentes de nitrogênio sob as características morfogênicas e estruturais, acúmulo de biomassa e eficiências de conversão e recuperação do nitrogênio em pastagem de Megathyrsus maximus cv. BRS Zuri. Foram testadas cinco doses de nitrogênio (0, 200, 400, 600 e 800 Kg de nitrogênio/ha) em delineamento experimental de blocos casualizados, com quatro repetições. Foi observado comportamento quadrático para as taxas de alongamento e aparecimento foliar, tempo de vida e o filocrono. Houve aumento no número de perfilhos e na produção de matéria seca quando as plantas foram submetidas à adubação, porém, tanto a eficiência de utilização quanto a recuperação aparente do nitrogênio reduziram linearmente com o aumento do nível de nitrogênio. O uso de fertilizante nitrogenado promoveu melhora nas características morfogênicas (P<0,05) exceto para taxa de alongamento de colmo e taxa de senescência foliar que se mantiveram estáveis. A Adubação com nitrogênio acelera as taxas de crescimento do Megathyrsus maximus cv. BRS Zuri. As respostas máximas nas variáveis morfogênicas, no número de folhas vivas e totais por perfilho são obtidas com doses próximas de 500 kg/ha, enquanto que doses variando de 600 a 647 kg/ha proporcionam maior tamanho de folha por perfilho, densidade populacional de perfilhos e produção de matéria seca. As eficiências de utilização e recuperação do nitrogênio reduzem com o aumento das doses de nitrogênio.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.