The objective was to verify possible modifications of the soil structure and the pattern of the spectral response of pasture vegetation cover to animal trampling. The study was carried out on a farm in the Agreste region of Pernambuco, Brazil in an area with continuous grazing by heifers. Soil samples were collected at 36 regular points, before and after the grazing period, where the physical properties of the soil were determined at a 0.00—0.10 m depth. Before and after grazing, images of the Sentinel-2A satellite were also obtained to observe the pasture vegetation response pattern over time through Vegetation Indexes. The soil attribute data were submitted to multivariate factorial analysis. The vegetation index maps were evaluated for spatial variability. The results showed that after the grazing, there was a significant change in soil attributes and pasture, which can indicate possible degradation processes.
Brazil is the largest producer and exporter of sugarcane in the world, and the sugar and ethanol sector has invested in the development of new technologies and methods of planting to meet the market demand. Thus, the aim of this study was to evaluate the performance of sugarcane at the acclimation phase and under field conditions, from pre-sprouted seedlings exposed to supplementary lighting, through light-emitting diode, in the period of acclimation in a greenhouse. The experiment was carried out in Carpina, PE, Brazil, from January to September 2017. The experimental plots were composed of pre-sprouted seedlings acclimated in greenhouse, exposed to the supplementary lighting systems, 90% Red + 10% Blue (R:B 90/10), 80% Red + 20% Blue (R:B 80/20), 70% Red + 30% Blue (R:B 70/30) and a control. The evaluation of seedling growth was performed through the measurement of biometric indicators: plant height (cm); stem length (cm); stem diameter (cm) and number of tillers. The biometric indicators showed no significant differences, but plants under lighting systems with a greater proportion of the red wavelength (R:B 80/20 and R:B 90/10) showed higher percentage of survival in the field.
The greater use of crop fields by increasing plant population is an alternative to minimize losses to the farmers who use crop intercropped provides other benefits such as lower incidence of diseases and pests, and better exploitation and enrichment agroecosystem. The objective of this study was to evaluate the effect of the population of peanuts with and without inoculation and intercropping with forage palm on growth, productivity and biomass peanut. The treatments consisted of different populations of peanut (one, two and three rows of peanut row spacing of two meters of cactus pear), with and without inoculant, analyzed in subdivided plot scheme (3 × 2), totalizing six treatments in a randomized block design with four replications. The variables evaluated were plant height, number of branches, shoot dry mass and root nodule number, nodule dry weight, biomass productivity and legumes. The largest population of plants in number of lines of peanut intercropped with forage cactus promotes greater total biomass production and yield of beans and does not alter the height, branch number, dry mass of aerial part roots and nodules. The inoculant application did not result in to increased productivity biomass and growth of peanut plants, their use is not indicated. The planting of a row of peanuts between the rows of palm is not economically recommended.
Caesalpinia ferrea Mart. Ex Tul. is a tropical arboreal species used in naval and civil construction, and in the recovery of degraded areas. The substrate used and temperature can interfere directly in the germination of this species. This work aimed to evaluate the influence of different substrates and temperature regimes on the seed germination potential and initial growth of C. ferrea seedlings. The experiment was conducted at the Plant Propagation Laboratory of the Federal University of Alagoas, Brazil. A completely randomized design was used in a 5 × 4 factorial scheme with five substrates (paper roll, paper, sand, and vermiculite) and four temperatures (20, 25, 30 and 35°C). The evaluated characteristics were first count of germination, germination, germination speed index, dry mass, and seedling length. Results showed that C. ferrea seeds could germinate under different temperatures and substrate conditions. The sand substrate and the temperature of 30°C are excellent for evaluating the physiological quality of the seeds.
Resumo: O estudo da evapotranspiração é de fundamental importância na correta utilização dos recursos hídricos, para o gerenciar de forma sustentável. Com isso, objetivou-se com esse trabalho avaliar, comparar e recomendar um ou mais métodos de estimativa de evapotranspiração com menor número de variáveis meteorológicas para a região de Nossa Senhora da Glória, Sergipe. Os dados de janeiro de 2018 a dezembro 2019, foram obtidos da estação meteorológica localizada na unidade experimental da Embrapa, campus Nossa Senhora da Glória. Foram aplicados os métodos de Blaney-Criddle, Camargo, Linacre, Jensen-Haise, Hargreaves & Samani e Penman-Momteih, que é o padrão da FAO. Os valores estimados por meio destes métodos foram comparados com os obtidos do método de Penman-Monteith, sendo avaliados através dos indicadores estatísticos do índice de concordância de Willmott, coeficiente de determinação (r2), coeficiente de correlação de Pearson (r), erro padrão de estimativa (SEE) e do índice de desempenho c. Em relação desempenho do índice c, os métodos foram classificados como, Blaney-Criddle (péssimo), Camargo (mau), Linacre (bom), Jensen-Haise (muito bom) e Hargraves & Samani (muito bom). Portanto o método de Jensen-Haise foi o mais indicado para estimar evapotranspiração de referência com menor número de variáveis climáticas, na região de realização do estudo.
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