01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
Navegar
2 resultados
Resultados da Pesquisa
Item Massa de forragem e valor nutritivo de capim-braquiária [Urochloa decumbens (Stapf) R. D. Webster] sob pastejo em monocultivo, com ou sem adubação, e em sistema silvipastoril(2024-10-01) Cavalcanti, Isaque da Silva; Cunha, Márcio Vieira da; Silva, Rita de Cássia Manso; http://lattes.cnpq.br/0329511011280265; http://lattes.cnpq.br/8936474723708253; http://lattes.cnpq.br/5434373242065945Silvopastoral systems provide significant ecological, economic, and social benefits. These systems can mitigate the negative effects of monoculture on soil by diversifying production through the integration of forestry practices, promoting animal welfare through shading, and enhancing nutrient cycling, which can improve soil fertility, particularly when involving tree legumes. Signal grass (Urochloa decumbens Stapf.) is the most widespread forage species in Brazilian pastures. The hypothesis of this study is that the silvopastoral system with the tree legume sabiá (Mimosa caesalpiniifolia Benth.) improves the nutritional value of Signal grass compared to monoculture, especially without fertilization, without significantly impacting herbage mass. The objective of this thesis was to evaluate herabage mass and the nutritional value of signal grass in monoculture, with or without fertilization (50 kg of N, P, and K ha⁻¹ year⁻¹), and in a silvopastoral system with the sabiá legume, during the rainy season (March to August 2023) and dry season (December 2022 to February 2023 and September to November 2023), in the semi-arid region of Pernambuco, Brazil. The grazing method used was continuous stocking with variable stocking rates, utilizing non-castrated male crossbred Nelore cattle with an average initial live weight of 170 kg. The experimental design was randomized block with three repetitions. The silvopastoral system showed a lower dry mass of green signal grass forage (2045 kg ha⁻¹) compared to the fertilized monoculture (2703 kg ha⁻¹), while it did not differ from the unfertilized monoculture (2327 kg ha⁻¹). Herbage mass was greater during the rainy season (2987 kg ha⁻¹). The silvopastoral system had a lower amount of senescent material compared to the unfertilized monoculture. Additionally, it exhibited a higher incidence of invasive plants compared to monocultures. There were no significant effects of treatments and seasons on the levels of dry matter, mineral matter, organic matter, neutral detergent fiber corrected for ash and protein, and hemicellulose of signal grass (296 g kg⁻¹ DM, 84 g kg⁻¹ DM, 916 g kg⁻¹ DM, 725 g kg⁻¹ DM, and 39 g kg⁻¹ DM, respectively). The crude protein content of the grass in the silvopastoral system was higher (51 g kg⁻¹ DM) than that of the unfertilized monoculture (41 g kg⁻¹ DM) and did not differ from that of the fertilized monoculture (44 g kg⁻¹ DM). However, it was not affected by the time of year. The levels of neutral detergent fiber and acid detergent fiber in signal grass were higher during the rainy season, averaging 794 and 402 g kg⁻¹ DM, respectively. The in vitro digestibility of dry matter of the forage was higher in the dry season (499.8 g kg⁻¹ DM). The silvopastoral system with the sabiá legume, while promoting lower signal grass herbage mass compared to fertilized monoculture, offers nutritional and structural advantages, such as increased crude protein content and reduced dead material, which can enhance animal diet and consumption.Item Uso do aplicativo Canopeo para estimativa da massa de forragem do capim-elefante consorciado ou não com cunhã(2022-06-03) Silva, Joás José da; Silva, Valdson José da; http://lattes.cnpq.br/6499654247132691; http://lattes.cnpq.br/6650079186954491Destructive assessment methods to estimate forage mass, although considered more accurate, are more labor intensive compared to non-destructive methods. Canopeo is a mobile app developed at the University of Oklahoma for Android and IOS systems and has been considered a good tool for estimating canopy coverage. This study aimed to evaluate the use of Canopeo to estimate forage mass of Elephant grass [Cenchurus purpureus (Schumach.) Morrone syn. Pennisetum purpureum Schum.] of different sizes intercropped or not with butterfly pea (Clitoria ternatea L.). The experiment was conducted at the Carpina Sugarcane Experimental Station (EECAC)/Federal Rural University of Pernambuco (UFRPE) between 2019 and 2022. Four elephant grass genotypes, being two of tall size (IRI-381 and Elephant B) and two dwarf size (Taiwan A-146 2.37 and Mott) in intercropped or not with cunhã were harvested every 60d. Data from two representative harvests in the rainy season of 2019 and 2022 were considered. Images were collected using a cell phone with a camera attached at the top and in the profile of the vegetation at a representative point of the average condition of each plot to estimate the green cover and percentage of pixel of green color in the canopy profile. The regression equations obtained to estimate the total forage mass generally showed the best R2 value in the intercropped condition during the 2019 rainy season, with R² 0.71. For estimates of total forage mass from the percentage of green in the canopy profile, the R² varied from 0.58 and 0.70 in the first year and from 0.62 to 0.63 in the the second year. The values of green cover of the top of the vegetation obtained with Canopeo application presented, in general, a better level of association with the total forage mass and green biomass in comparison with the measurements carried out from the canopy profile. The Canopeo application can be considered an interesting tool to estimate the total forage mass and leaf mass of elephant grass genotypes intercropped or not with butterfly pea.