Revista Engenharia na Agricultura - REVENG 2024-04-03T09:55:34-03:00 RENATA CÁSSIA CAMPOS Open Journal Systems <p>Engenharia na Agricultura é uma revista de fluxo contínuo que tem como objetivo divulgar e difundir a produção científica das diversas áreas da Engenharia Agrícola. É necessário que os diversos leitores interessados no assunto tenham acesso aos novos conhecimentos científicos e às inovações tecnológicas, e a publicação numa revista constitui uma forma prática, usual e eficiente para se divulgar trabalhos dessa natureza. O objetivo desta Revista é divulgar conhecimento científico atualizado, com a presteza e agilidade que não é possível ao livro e com a abrangência que é própria da revista.</p> Emergence and initial growth of cowpea varieties at different temperatures 2023-08-10T11:32:34-03:00 Magno do Nascimento Amorim José Aliçandro Bezerra da Silva Diego Ariel Meloni Edson Pereira da Silva Késsia Caroline Dantas da Silva Marcelo da Silva Martins <p>Brazil is the largest producer and consumer of beans in the world; however, the prospect of climate change could affect this production. Among these changes, the incidence of rising temperatures can directly affect the crop cycle, influencing biochemical processes that occur during seed germination and seedling emergence. The objective of this work was to determine the optimum temperature level for the emergence and initial growth of three varieties of cowpea. The experiment was conducted in a laboratory linked to the Federal University of the São Francisco Valley, Juazeiro Campus, state of Bahia, with a completely randomized design (DIC), in a 6x3 factorial scheme, with six treatments at different temperature levels: 20, 25, 30, 35, 40 and 45 °C; and three varieties of cowpea: BRS Pajeú, BRS Nova Era and BRS Pujante. The following variables were assessed: speed index, average time, relative frequency and percentage of emergence; stem length and diameter; accumulation of fresh and dry biomass in the stem, leaf and root. The ideal temperature range found for the emergence and initial growth of the cowpea varieties BRS Pajeú ranged from 27 to 32 ºC, for BRS Nova Era between 30 and 41 ºC and for BRS Pujante between 29 and 35 ºC. As the BRS Nova Era variety performs better in high temperature conditions, it could be an alternative for growing beans in the face of climate change.</p> 2024-03-01T00:00:00-03:00 Copyright (c) 2024 Revista Engenharia na Agricultura - REVENG Nitric Oxide as an Attenuator of Copper Toxicity in the concentration of Nutrients in maize Seedlings 2024-04-03T09:55:34-03:00 Ana Ecidia de Araújo Brito Priscilla Andrade Silva Job Teixeira Oliveira Cassiano Garcia Roque Tulio Russino Castro Cândido Ferreira de Oliveira Neto <p>The maize crop is highlighted in the worldwide and Brazilian agribusiness, presenting itself as a raw material for both human and animal nutrition. Nitric oxide (NO) stands out as a signalling molecule playing a crucial role in plant responses to abiotic stresses as caused by heavy metals. Therefore, the objective of this work was to evaluate the effect of nitric oxide on the levels of macro and micronutrients, such as cationic magnesium, calcium, iron, copper, zinc and manganese. The copper bioaccumulation and translocation factor, in the initial growth of maize seedlings were subjected to copper toxicity. The seeds were soaked for 48 hours in Germitest paper using a solution containing sodium nitroprusside Na<sub>2</sub>[Fe(CN)<sub>5</sub>NO]2H<sub>2</sub>O as a donor of nitric oxide, sodium ferrocyanide Na<sub>4</sub>Fe (CN)<sub>6</sub> as compensator and deionized water (control). The experiment was carried out in a 4 x 3 completely randomized factorial design with 12 treatments and 8 repetitions, totaling 96 trays containing 25 seeds per repetition. The results showed that the doses of nitric oxide were not sufficient to attenuate the copper toxicity, highlighting the metal accumulation in the roots. The doses of sodium nitroprusside and sodium ferrocyanide provided toxicity, changing the mineral balance in the mobilization of macro and cationic micronutrients and their translocation to the aerial part of K9606VIP3 maize seedlings in the initial growth.</p> 2024-07-11T00:00:00-03:00 Copyright (c) 2024 Revista Engenharia na Agricultura - REVENG