Salinity interferes in the physiology of seedlings from germination and seedling emergence, so it is necessary to adopt measures to mitigate its effects. The objectives of this research were to evaluate irrigation frequency, saline water, polymer, and container volume in the emergence and physiology of Talisia esculenta (A. St.-Hil.) Radlk. The treatments were obtained from the combination of polymer doses (0.0; 0.2; 0.6; 1.0; and 1.2 g dm-3), electrical conductivities of the irrigation water (0.3; 1, 1; 2.7; 4.3; and 5.0 dS m-1), and irrigation frequencies (daily and alternate), plus two additional treatments to assess the volume of the container. A randomized block design was used. Emergence and leaf indices of chlorophyll, fluorescence, and gas exchange were analyzed 100 days after sowing. The increase in electrical conductivity reduced and delayed seedling emergence. Decreasing irrigation frequency reduced the chlorophyll b index, stomatal conductance, transpiration, net CO2 assimilation, and carboxylation efficiency. The magnitude of the effects of electrical conductivity of water and polymer were associated with the frequency of irrigation. However, both salinity and polymer reduced practically all physiological variables. The reduction in container volume also affected the physiology of the seedlings, with more effects when irrigated on alternate days. The T. esculenta seedlings are considered sensitive to salinity, should be irrigated daily with water with less electrical conductivity than 1.0 dS m-1, as well as higher capacity containers used (0.75 vs 1.30 dm3).
RESUMONo presente trabalho objetivou-se determinar a marcha de acumulação de macro e de micronutrientes cultivado sob fertirrigação. O experimento foi realizado em área pertencente à Empresa Ecofértil Brazilian Journal of DevelopmentBraz. 12655Agropecuária LTDA localizada no município de Aracati (CE). O experimento foi instalado em delineamento de blocos casualizados com 9 tratamentos, correspondentes a 9 períodos de avaliação 14, 21, 28, 35, 42, 49, 56, 63, 70 dias após transplantio com quatro repetições. Em intervalos de sete em sete dias, as plantas foram coletadas e separadas em folha, caule, fruto e semente para fins da determinação de N, P, K, Ca, Mg, S, Fe, Mn, B, Zn e Cu, para a quantificação dos totais acumulados destes nutrientes. Na ocasião da coleta de planta, uma amostra de solo foi coletada em cada parcela para a determinação dos nutrientes. De acordo com os resultados, o acúmulo de massa seca nas partes reprodutivas foi maior que nas partes vegetativas, sendo os frutos os órgãos de maior acúmulo de massa seca. Já a marcha de acúmulo de nutrientes seguiu a seguinte ordem:K>Ca>N>Mg>P>S>Fe>Cu>B>Zn>Mn. Palavras-chave:Cucumis melo L., nutrição mineral, melão amarelo, acúmulo de massa seca. ABSTRACTThe objective of this study was to determine the progression of macro and micronutrients accumulation of the melon cultivated under fertirrigation. The experiment was carried out in an area belonging to the Company Ecofértil Agropecuária Ltda located in the city of Aracati (CE). The experiment was carried out in a randomized block design with 9 treatments, corresponding to 9 evaluation periods 14, 21, 28, 35, 42, 49, 56, 63, 70 days after transplanting (DAT) with four replications. The useful part for the purpose of collection was constituted of 8 plants becoming the four centers of each row. At intervals of seven days, the plants were collected and separated into leaf, stem, fruit and seed for the determination of N, P, K, Ca, Mg, S, Fe, Mn, B, Zn and Cu, for The quantification of accumulated totals of these nutrients. At the time of plant collection, a soil sample was collected in each plot to determine the nutrients. According to the results, the accumulation of dry mass in the reproductive parts was higher than in the vegetative parts, the fruits being the organs
O objetivo com essa pesquisa é classificar os potenciais impactos ambientais resultantes de empreendimentos de curtumes e sugerir medidas de controle ambiental para tais impactos. A metodologia utilizada consistiu em levantamentos e estudos bibliográficos, através de leituras de artigos científicos, livros, manuais (Manual de Impactos Ambientais do Banco do Nordeste), Relatórios e Estudos de Impacto Ambiental, tendo a finalidade de coletar informações necessárias para a identificação e classificação dos impactos ambientais resultantes da implantação de curtumes. Torna-se evidente que os impactos ambientais significativos, sejam eles positivos ou negativos, resultantes de todas as atividades realizadas em todas as etapas de um projeto de um determinado empreendimento, devem ser estudados, com a finalidade de se avaliar a viabilidade ambiental para a implantação do projeto. A fase de planejamento não apresenta impactos ambientais significativos e que os impactos ambientais significativos são mais observados na fase de implantação do empreendimento. Os fatores ambientais: solo e recursos hídricos, bem como os fatores bióticos fauna e flora apresentaram uma grande quantidade de impactos significativos negativos. Dos 38 impactos identificados, 32 foram considerados significativos, destes 29 foram considerados negativos, 3 foram considerados positivos e 6 foram considerados não significativos.
Currently, Brazil is the world's largest sugarcane producer, with a planted area of approximately 8.59 million hectares. For being a crop of great prominence in the world economy, sugarcane has been widely researched, especially in the study of the causes that limit its productivity, with emphasis on water availability, an important factor to be considered in Brazil, because much of the cultivation takes place in drought regions, and the producing locations are limited to seasonal rainfall. However, sugarcane may present certain mechanisms for tolerance to water stress, especially with the use of foliar fertilization for that tolerance. Therefore, this study aimed to analyze the effects of foliar fertilization as a form of tolerance to water deficit in sugarcane crop. Water stress is the responsible factor for promoting physiological changes in the crop, enabling structural and functional alterations at various organizational levels of the plant. Furthermore, another approach to minimize the effects of water stress in sugarcane is to explore the plant's defense mechanisms, especially with the use of foliar fertilization as an alternative to tolerance to water deficit, considering the several benefits caused by this application method. Plant regulators are a viable option for reducing the negative physiological causes of water stress in plants, besides helping the plant to maintain physiological processes with a rapid recovery after overcoming water stress.
O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.
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
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.