The use of saline water for irrigation in semi-arid regions has become a reality due to the water scarcity that occurs in most of the year. In this scenario, exogenous application of salicylic acid may be a strategy to mitigate the deleterious effects of salt stress on plants and ensure the production of socioeconomically important crops in the semiarid region of Northeast Brazil, such as bell pepper. Thus, this study examines the osmoprotective effect of salicylic acid on gas exchanges, chloroplast pigments and production components of ‘All Big’ bell pepper plants irrigated with water with different saline levels. The experiment was carried out in greenhouse conditions in Campina Grande - PB, Brazil. Treatments consisted of four levels of electrical conductivity on the irrigation water (0.8, 1.6, 2.4 and 3.2 dS m-1) and four concentrations of salicylic acid (0, 1.2, 2.4 and 3.6 mM), which were distributed in a 4 × 4 factorial arrangement in a randomized block design with three replicates. Increases in irrigation water salinity from 0.8 dS m-1 resulted in changes in gas exchange and total chlorophyll levels of ‘All Big’ bell pepper plants. The estimated salicylic acid concentration of 1.7 mM reduced the effects of salinity on stomatal conductance, transpiration, CO2 assimilation rate, instantaneous carboxylation efficiency, total chlorophyll and fruit diameters. Irrigation with water of 1.8, 0.8 and 1.6 dS m-1 salinity associated with the estimated salicylic acid concentration of 1.6 mM increased the biosynthesis of chlorophylls a and b and the number of fruits, respectively, in bell pepper plants.
ESTRATÉGIAS DE IRRIGAÇÃO COM DÉFICIT HÍDRICO NOS ESTÁDIOS FENOLÓGICOS DO FEIJÃO-CAUPI SOB ADUBAÇÃO POTÁSSICA LAURIANE ALMEIDA DOS ANJOS SOARES1; THAMARA LAYSE FREITAS MEDEIROS2; VICTORIA CRISTINA GOMES COLMAN3; IRLAN VICTOR DE SOUSA PALMEIRA4; IDELVAN JOSÉ DA SILVA5 E ROMULO CARANTINO LUCENA MOREIRA6 1 Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, Brasil. E-mail: laurispo.agronomia@gmail.com 2 Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, Brasil. E-mail: thamaraamedeiross@gmail.com 3 Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, Brasil. E-mail: vikcolman@gmail.com 4 Unidade Acadêmica de Ciências Agrárias, Universidade Federal de Campina Grande, UFCG, Rua Jario Vieira Feitosa, 1770, Bairro dos Pereiros, Pombal, PB, Brasil. E-mail: irlan7764@gmail.com 5 Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, Brasil. E-mail: idelvan3@hotmail.com 6 Unidade Acadêmica de Engenharia Agrícola, Universidade Federal de Campina Grande, UFCG, Rua Aprígio Veloso, 882 -Universitário, Campina Grande, PB, Brasil. E-mail: romulocarantino@gmail.com 1 RESUMO Palavras-chave: Vigna unguiculata L., tolerância à seca, nutrição mineral SOARES, L. A. dos A.; MEDEIROS, T. L. F.; COLMAN, V. C. G.; PALMEIRA, I. V. de S.; SILVA, I. J. da; MOREIRA, R. C. L. IRRIGATION STRATEGIES WITH WATER DEFICIT IN THE PHENOLOGICAL STAGES OF THE COWPEA UNDER POTASSIC FERTILIZATION 2 ABSTRACT In semi-arid regions, water deficiency is the main environmental factor that influences the yield of plants, in these regions the proper management of resources is essential in order to guarantee the sustainability of the production system. Thus, this study aimed to evaluate the morphology and phytomass partition of cowpea (Vigna unguiculata L.), to cultivate BRS Marataoã, when submitted to water deficit management strategies in different phenological stages of the crop and fertilization doses potassium. A randomized block design was used, in a 5 x 5 factorial scheme, with three replications, with the treatments being defined according to the five potassium fertilization doses (50, 75, 100, 125, and 150% of K2O) associated with five water deficit management strategies at the different phenological stages of the crop. The application of water deficit associated with potassium doses favored the growth and accumulation of phytomass in the flowering phase. Increasing doses of potassium when associated with water deficit in the flowering and fruiting stages compromise the number of pods and pod length. In the early stages of the development of cowpea, irrigation with water deficit can be applied without significant losses in the production components. Keywords: Vigna unguiculata L., drought tolerance, mineral nutrition
Aims: To study the growth and gas exchanges of arugula plants under water stress and phosphate fertilisation as attenuator. Study Design: The experimental design was randomised blocks, with treatments arranged in a 5 x 2 factorial scheme, corresponding to five doses of P 2 O 5 (0, 50, 100, 150 and 200 mg dm-3) and two irrigation depths, 50% of the real evapotranspiration (ETr) and 100% ETr, with four replicates, totaling 40 experimental units.
Todos os direitos reservados. 1ª edição Editoração eletrônica/ diagramação: Walter Rodrigues Organização e preparação de originais: Deividy Edson Projeto de capa: dos organizadores Dados Internacionais de Catalogação na Publicação (CIP) de acordo com ISBD P472 Pesquisa e Inovação em Sistemas Agrícolas e Ambientais [recurso eletrônico] / vários autores; organizado por Francisco de Assis da Silva, Mirandy dos
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