ABSTRACT:In order to provide scientific information about the irrigated cauliflower production in Northeast of Para, an experiment was installed in the Federal Rural University of Amazonia farm with the Desert hybrid under different water tensions on the ground and boron doses in the municipality of Igarapé-Açu -PA. The experimental design was a randomized block in a 4 x 4 factorial, sixteen treatments with three replications. The treatments consisted of four water tensions on the ground (15, 30, 45 and 60 kPa) as an indicative of the time to irrigate and four boron doses (0, 2, 4 and 6 kg ha -1 ). The irrigation was performed with drippers and irrigation management with tensiometers. Each plot, 4 m 2 , consisted of 8 plants located in the spacing of 1.0 m between lines and 0.5 m between plants. The hybrid is promising for cultivation in the soil and climatic conditions of the region where it was evaluated, with productivity of 17.1 t ha -1 , fresh mass of the inflorescence of 0.85 kg plant -1 , inflorescence diameter of 18 cm, in 38 kPa tension. The optimal dose of boron which ensured greater production of dry mass was 3 kg ha -1 .
Viabilidade econômica da produção de couve-flor irrigada por gotejamento no Nordeste Paraense Economic viability of cauliflower production drip irrigated in Northeast Paraense Contribuição dos autores: Michel Emerson Martins Pereira conduziu o experimento, a análise estatística e a redação do artigo; Joaquim Alves de Lima Junior supervisionou e acompanhou todas as etapas, além das análises estatísticas e redação do artigo; Valdeides Marques Lima contribuiu com a revisão bibliográfica e a redação do artigo; Sérgio Antonio Lopes de Gusmão contribuiu com a revisão bibliográfica e a redação do artigo; Pedro Daniel de Oliveira colaborou com revisão ortográfica, gramatical e redação científica. André Luiz Pereira da Silva contribuiu com a redação do artigo e com a revisão ortográfica e gramatical Agradecimentos: Ao Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico (CNPq), pelo suporte e financiamento, e
Soil carbon (C) content is a sensitive indicator of agricultural management impact. Different methods are usually adopted to determine soil C content, which can lead to variable results and therefore hinder the correct interpretation of management impacts. In this study, we tested three commonly used soil C determination methods (dry combustion with elemental analysis, dry combustion with loss-on-ignition, and wet combustion) with soil samples from agricultural sites under different management conditions (fire and fire-free land preparation) and forest. The wet combustion method underestimated soil C content in relation to the standard method (dry combustion with elemental analysis). We found high determination coefficients of predictive equations of total C (dry combustion with elemental analysis) based on concentration values determined either through wet combustion or losson-ignition. Thus, we recommend the use of the loss-on-ignition method, which is cheap, fast, and of low environmental impact, to predict total soil C concentration under the studied management conditions. RESUMO: O teor de carbono (C) no solo é um indicador sensível de impacto de manejo agrícola. Diferentes métodos são atualmente adotados para determinar o teor de C do solo, o que pode levar a resultados variados e, dessa maneira, dificultar a interpretação dos impactos do manejo. Neste estudo, testamos três métodos de determinação de C comumente usados (combustão via seca em analisador elementar, combustão via seca por perda de massa por ignição e combustão via úmida), com amostras de solo de áreas agrícolas sob diferentes manejos (preparo de área com e sem queima) e de floresta. O método de combustão via úmida subestimou o teor de C do solo em relação ao método padrão (combustão via seca em analisador elementar). Encontramos altos coeficientes de determinação das equações de predição do C total (combustão via seca em analisador elementar), baseada em valores determinados tanto por combustão via úmida quanto por combustão via seca por perda de massa por ignição. Portanto, recomendamos o uso do método de perda de massa por ignição, que é barato, rápido e de baixo impacto ambiental, para predizer a concentração total de C sob as condições de manejo estudadas.
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.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.