Supplemental irrigation during dry spells could reduce maize yield losses in tropical semi-arid regions, notably in small farms. However, good quality water reserves are not sufficient to meet the demands of farming communities. Consequently, our objective was to evaluate the productivity and profitability of maize under different simulated rainfall scenarios, with and without supplemental irrigation (SI) with brackish water. The field experiments were carried out during the cropping seasons of 2018 and 2019 on Ultisol. The experiment followed a randomized block design in the split-plot scheme with four replicates. The plots were formed by simulating the water supply in the soil corresponding to four water scenarios (rainy, normal, drought and severe drought), and the sub-plots with or without SI with brackish water (Electrical conductivity of 4.5 dS m -1 ). Mean yields of green maize ears were 13,083, 11,532, 10,358 and 9,609 kg ha -1 for rainy, normal, drought and severe drought scenarios, as supplemented with brackish water. For the same treatments without SI the values were 11,394, 7,896, 3,913 and 1,374 kg ha -1 , respectively. Data on farmer's income showed that under normal, drought and severe drought supplementation with brackish water becomes economically advantageous from 0.9, 1.0 and 2.4 ha, respectively, while maize cultivation without SI is not advantageous under the last two scenarios. For severe drought conditions, however, SI using brackish water reduced commercial yield by 27 % with negative effects on the farmers' profitability. In this case, it is necessary to use water with either lower salinity or select salt tolerant crops.
The use of management strategies or changes in the cultivation environment can reduce the impacts of irrigation water salinity on plant development. Therefore, in this research, physiological responses, initial growth, and plant quality of Anadenanthera colubrina (Vell.) Brenan (Angico Branco) were evaluated under different levels of shading and electrical conductivity of the irrigation water, seeking to identify the most favorable conditions for the development of this species using brackish water. The experiment was carried out in randomized blocks with split plots and four replications. The plots were formed by four environments with different shading levels: 0 (full sun), 30, 50, and 70%, and the subplots, formed by five increasing levels of electrical conductivity of the irrigation water: 0.4, 1.6, 2.8, 4.0, and 5.2 dS.m−1. The following variables were evaluated: substrate electrical conductivity, leaf gas exchange, plant height, biomass production, and Dickson quality index at 40 days in a nursery. The use of artificial shading favored plant development and photosynthesis rate, even when irrigated with moderate and high salinity water. The DQI showed that A. colubrina plants presented higher quality index when produced under intermediate shading (30% and 50%), with yield losses below 20% when irrigated with water with electrical conductivity up to 2.8 dS.m−1.
Proper management of brackish water can increase plant production in the Brazilian semi-arid region. The objective of this study was to evaluate the production performance and water use efficiency of two peanut genotypes irrigated with brackish water during the reproductive stage, in soil with and without soil cover. The study was conducted in a greenhouse. The experimental design used was randomized blocks, with four replicates, in a 2 x 2 x 2 factorial scheme (two electrical conductivities of irrigation water -ECw 0.9 and 5.0 dS m -1 , two peanut genotypes -AC 130 and cv. BR1, and the presence or absence of soil cover). At 72 days after sowing, harvest was performed and the following variables were evaluated: number of marketable pods, number of non-marketable pods, pod mass, diameter and length, production and water use efficiency. Salinity impacted production more than the water use efficiency in the two peanut genotypes, with the relative reduction in production being higher in cv. BR-1. Soil cover with dead plant material mitigated the effects of salinity on production and increased water use efficiency, only in genotype AC 130.
INFLUÊNCIA DA IRRIGAÇÃO SUPLEMENTAR COM ÁGUAS RESIDUÁRIAS SOBRE AS TROCAS GASOSAS FOLIARES DO ALGODOEIRO ADRIANA CRUZ DE OLIVEIRA1; ANTONIO FLAVIO BATISTA DE ARAUJO2; CLAUDIVAN FEITOSA DE LACERDA3; JUVENALDO FLORENTINO CANJÁ4; LUCIANA LUZIA PINHO5 E NAARA IORRANA GOMES SOUSA6 1 Mestranda no Programa de Pós-Graduação em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: drica_fj@hotmail.com.br 2 Doutorando no Programa de Pós-Graduação em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: antonioflaviobatistadearaujo@gmail.com 3 Professor Titular do Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: cfeitosa@ufc.br 4Mestrando no Programa de Pós-Graduação em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: batchijuve@gmail.com 5 Mestranda no Programa de Pós-Graduação em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: englucianaufc@gmail.com 6 Mestranda no Programa de Pós-Graduação em Engenharia Agrícola, Departamento de Engenharia Agrícola, Universidade Federal do Ceará-UFC, Av. Mister Hull, s/n -Pici, Centro de Ciências Agrárias, Bloco 804, CEP: 60455-760, Fortaleza-CE, Brasil. E-mail: naara_iorrana@hotmail.com 1 RESUMO O uso de águas residuárias na irrigação tem crescido como suplementação para driblar a escassez hídrica. Contudo, pouco se sabe sobre as respostas das culturas sobre sua aplicação. Assim, objetivou-se avaliar os impactos da irrigação suplementar com águas residuárias tratadas sobre as trocas gasosas do algodoeiro (Gossypium hirsutum L), simulando-se cenários hídricos considerados normais, seca e seca severa, na presença e ausência de NPK. O experimento foi conduzido no município de Russas – CE, em área vizinha à lagoa de estabilização da CAGECE – Companhia de Água e Esgoto do Estado do Ceará, em DBC, no esquema de parcelas subsubdivididas, com quatro blocos. As parcelas foram cenários hídricos (normal, seca e seca severa); a subparcela foi a suplementação ou não com água residuária tratada nos veranicos simulados; a subsubparcela foi a aplicação ou não de NPK. A cultivar utilizada foi BR 433. Aos 25 dias após a semeadura foram analisadas fotossíntese, transpiração, concentração interna de CO2 e temperatura foliar. Os cenários de seca e seca severa apresentaram pequeno impacto sobre as trocas gasosas foliares do algodoeiro. Entretanto, a irrigação suplementar reduziu a temperatura foliar e atenuou os efeitos do cenário de seca sobre a fotossíntese, independente da aplicação ou não de NPK. Palavras-chave: Gossypium hirsutum L, Reúso de água, Seca. OLIVEIRA, A. C. de; ARAUJO, A. F. B. de; LACERDA, C. F. de; CANJÁ, J. F.; PINHO, L. L.; SOUSA, N. I. G. INFLUENCE OF SUPPLEMENTAL IRRIGATION WITH WASTEWATER ON COTTON LEAF GAS EXCHANGE 2 ABSTRACT The use of wastewater in irrigation has grown as a supplement to circumvent water scarcity. However, little is known about the responses of cultures to its application. Thus, the objective was to evaluate the impacts of supplementary irrigation with treated wastewater on gas exchange of cotton (Gossypium hirsutum L), simulating water scenarios considered normal, drought and severe drought, in the presence and absence of NPK. The experiment was conducted in the municipality of Russas - CE, in an area next to the stabilization pond of CAGECE - Companhia de Agua e Esgoto do Estado do Ceará, in DBC, in the subdivided plot scheme, with four blocks. The plots were water scenarios (normal, drought and severe drought); the subplot was supplemented or not with wastewater treated in the simulated summer days; the sub-installment was the application or not of NPK. The cultivar used was BR 433. At 25 days after sowing, photosynthesis, transpiration, internal CO2 concentration and leaf temperature were analyzed. The drought and severe drought scenarios had little impact on the cotton leaf gas exchange. However, supplementary irrigation reduced leaf temperature and attenuated the effects of drought scenario on photosynthesis, whether or not NPK was applied. Keywords: Gossypium hirsutum L, Water reuse, Drought.
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