Browsing by Autor "Helder Morais Mendes Barros"

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    Sunflower growth irrigated with sewage effluent under organic fertilization
    (Federal University of Uberlândia, 2019) Helder Morais Mendes Barros; Hans Raj Gheyi; Kaline Dantas Travassos; Nildo da Silva Dias; Moadir de Sousa Leite; Mara Karinne Lopes Veriato Barros; René Chipana Rivera
    In the semi-arid region of Brazil due to water scarcity, the use of alternative water sources is of vital importance, such as the use of saline waters and treated sewage effluents. Therefore, in the present work, the growth of sunflower plants irrigated with tap water and treated domestic sewage effluent, associated with organic fertilization was evaluated. The research was carried out in a protected environment at the Federal University of Campina Grande, Campus I, Campina Grande, PB. A completely randomized experimental design with factorial arrangement was used (4 x 2) + 2, with 5 repetitions. the treatments consisted of organic manure dosages (7.5, 10, 12.5 and 15% of manure on a weight basis) and two water sources (supply water and treated domestic sewage effluent). According to the results obtained, it can be indicated that the use of domestic sewage effluent for sunflower irrigation increased sunflower growth in relation to the use of water supply. The application of manure doses of 12.5 and 15% improved the early growth of the sunflower, with significant increases in the growth variables.
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    Water consumption of the sunflower crop irrigatedwith saline water
    (National University of Colombia, 2019) Kaline Dantas Travassos; Hans Raj Gheyi; Helder Morais Mendes Barros; Frederico Antônio Loureiro Soares; Cláudio Augusto Uyeda; Marcelo Tavares Gurgel; Nildo da Silva Dias; René Chipana Rivera
    The objective was to evaluate the water consumption of sunflower cultivars irrigated with saline waters. The experimental design utilized was in randomized blocks of a 2 x 4 factorial arrangement. This was composed of two levels of electrical conductivity (ECw) of irrigation water (N1 - 0.6 and N2 - 3.0 dS m-1 at 25 ºC) and four cultivars of sunflower (C1 - Helio 863, C2 - Embrapa 122-V2000, C3 - Catissol 01 and C4 - Multissol), with three replications, each of them with three plants totaling 72 experimental units. There was a reduction in water consumption of sunflower cultivars irrigated with saline water (N2 - 3.0 dS m-1). The irrigation with saline water resulted in a greater volume of drained water in all sunflower cultivars.