Este trabalho objetivou avaliar a produtividade e os caracteres fenotípicos de sete variedades locais de milho e um híbrido em plantio direto orgânico com dois manejos de palha. O experimento foi conduzido em delineamento de blocos ao acaso no município de Carazinho (RS), no ano de 2019/2020, em esquema bifatorial (2 x 8), com dois manejos de palha (Roçada e Rolo-faca). As coberturas verdes utilizadas foram Avena sativa L. e Vicia sativa L. Foram avaliados o ciclo e a floração dos genótipos, seus caracteres fenotípicos e a produtividade. ‘Oito carreiros’, ‘Ferro’, ‘Bico de ouro’ e ‘Palha roxa’ foram mais precoces no manejo com roçada (149, 148 e 149 DAS), e ‘Cabo roxo’ no manejo com rolo-faca (146 DAS). Nos caracteres fenotípicos, ‘Palha roxa’ e híbrido demonstraram menor porte no manejo com rolo-faca (171,1 e 177,5 cm) diferindo significativamente dos demais. Na altura de espiga, híbrido (69,3 cm), ‘Cabo roxo’ e ‘Palha roxa’ (84,4 e 87,1 cm), no manejo com rolo-faca, diferiram dos outros genótipos. Não houve diferença entre os tratamentos em: peso de grãos por espiga, diâmetro de colmo e comprimento de espiga. No manejo com roçada, apenas ‘Cabo roxo’ não superou os genótipos do manejo com rolo-faca no estande de plantas. ‘Brancão’ apresentou alta produtividade (11980 kg.ha-1) no manejo com roçada. Em um ano agrícola de severa estiagem, verificou-se boas produtividades das variedades locais em relação ao híbrido na produção orgânica com plantio direto e dois manejos de palha.
The objective of this study was to verify if Landrace maize compared to conventional hybrid corn differ in cycle and morphoagronomic traits when grown in agroecological system. The experiment was conducted at the Center for Agricultural Research at the Passo Fundo University, in a randomized block design with five replications, three Landraces of Creole maize (“Cabo roxo”, “Aztequinha” and “FrancoBrazileiro”) and hybrid maize. conventional (22s18 - Sementes Sempre). The fertilizer inputs were made with organic compost and Efficient Microorganisms (MS). Spontaneous species population, phenological cycle, stem diameter, ear and grain characteristics and yield per hectare were evaluated. The treatments did not differ significantly in the evaluation of the cycle in days presenting statistical difference only in plant height at the end of the cycle, where the Landrace “Cabo roxo” presented height of 209,9 cm. Regarding plant and ear characterization, the treatments differed significantly only in the evaluation of grain weight per ear, where the conventional hybrid reached 170,4 g. Thus, it was found that there is little significant difference between the local breeds and the conventional hybrid in the agroecological production system using mulch mass.
Animal production systems and agribusinessShort communication Efficiency of chemical preservatives used in raw milk samples for bacterial counts by flow cytometryABSTRACT -The objective of this study was to evaluate and compare two chemical preservatives in terms of their sample preservation capabilities, considering the individual bacterial count (IBC) and time and temperature variables. Samples were collected in expansion tanks in three commercial dairy farms located in the northwest of Rio Grande do Sul, characterized as G1: low IBC values, G2: average IBC values, and G3: high IBC values. The tanks were stored at three different temperatures (4, 10, and 25 °C) for 14 d. Samples supplemented with the preservative Azilat in G1 (lower IBC group) exhibited the best results at a temperature of 4 °C, whereas for G2 and G3, the results showed no statistically significant difference between temperatures 4 and 10 °C. The temperature 25 °C exhibited the worst results. For samples preserved with Azidiol, regardless of the studied group (G1, G2, and G3), the temperatures of 4 and 10 °C did not present a significant difference regarding the preservation of the samples, with the temperature of 25 °C exhibiting the worst results. Azilat was effective in keeping the samples conserved when they presented low IBC, being able to fluctuate with the increase in IBC and temperature variation. Azidiol was effective regardless of the initial IBC level.
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