Cruz das Almas, Brazil
Cruz das Almas, Brazil

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Simoes K.S.,UFRB | Almeida A.T.,UFRB | Ledo C.A.S.,Embrapa Mandioca e Fruticultura
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

Wastewater from domestic sewage presents levels of macro and micro nutrients sufficient to support a large part of the crops. Besides being a viable alternative to increase water availability, it is an effective way to control pollution and preserve the environment. In this context, an experiment was carried out to evaluate the influence of applying different dilutions of treated wastewater from domestic sewage on the microbial activity of a distrophic cohesive yellow Latosol in the Recôncavo of Bahia. Its effect on early growth of dwarf castor bean plants MPB 01 were also evaluated. Soil microbial activity and growth characteristics such as plant height, stem diameter, shoot dry weight, root dry weight and root volume were evaluated. According to the results, the effluent of treated wastewater without dilution, stimulates microbial activity of distrophic cohesive yellow Latosol and impairs the early growth of dwarf castor bean MPB 01.

Santos Junior J.A.,Federal Rural University of Pernambuco | Gheyi H.R.,Nucleo de Engineering de Agua e Solo | Cavalcante A.R.,UFRB | Dias N.S.,UFERSA | Medeiros S.S.,Nucleo de Recursos Hidricos
Engenharia Agricola | Year: 2016

In view of the specific characteristics regarding infrastructure, soil, climate, hydrology and social conditions of the Brazilian semi-arid, it is of paramount importance the use of alternative cropping systems, which take into account such features, as well as considering local water quality. In this sense, our study aimed to evaluate saline stress effects on sunflower production and post-harvest which are grown in an alternative low-cost hydroponics. Experimental design consisted of completely randomized blocks in 4 × 3 factorial scheme, with three replications. Treatments assessed the effect four salinity levels in hydroponics nutrient solution (1.7 - control, 4.3, 6.0, and 9.0 dS m-1) on crop production of three sunflower cultivars ('Sol Noturno', 'Bonito de Outono', and 'Anão de Jardim'). Our results showed that even at a maximum salinity level in nutrient solution (9 dS m-1), number of petals postharvest life remained within commercial standards for both 'Sol Noturno' and 'Anão de Jardim' cultivars.

Coelho E.F.,Embrapa Mandioca e Fruticultura | Costa F.S.,Federal University of Campina Grande | da Silva A.C.P.,UFRB | Carvalho G.C.,Federal Rural University of Pernambuco
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The objective of this study was to evaluate the effects of concentration of urea and potassium nitrate in the irrigation water on the concentration of nitrate in the soil solution and in saturation extract of soil at two depths of root system of Plaintans banana cv Terra Maranhão under fertigation. The experiment was carried out during the period of January to December, 2008 and followed a randomized block design with three replications in a 2 × 4 factorial scheme where treatments consisted of the use of two nitrogen sources (urea and potassium nitrate) under four concentrations (2.7; 4.0; 6.5 and 7.2 g L-1), applied by drip irrigation with three 4 L h-1 emitter per plant. Soil and soil solution samples were collected monthly in all treatments at depths of 0.30 and 0.60 m and nitrate concentration was determined in the soil solution and saturation extract. Results allowed to conclude that the increase of nitrogen fertilizer concentration in fertigation water caused an increase of nitrate ion concentration in the soil solution and in saturation extract for the two applied sources.

de Souza R.M.,Federal University of Campina Grande | Nobre R.G.,Federal University of Campina Grande | Gheyi H.R.,UFRB | Dias N.S.,UFERSA | Soares F.A.L.,Brazilian National Council for Scientific and Technological Development
Revista Caatinga | Year: 2010

The aim of this research was to examine the response of utilization of wastewater and organic manure on the growth of sunflower (Helianthus annuus L. cv. Embrapa BRS Oásis). The study was carried out from April to July 2009 in a greenhouse. Sunflower plants were irrigated with wastewater and tap water combined with doses of humus (w/w) of 0.5, 1.0, 1.5 and 2.0% and two controls (wastewater + mineral NPK and tap water + NPK) with three replications. Humus application did not show significant effect on any variable analyzed except duration of post-harvest where all treatments presented duration more than the established by the market, while the wastewater was efficient in all assessments, promoting substantial increases in the growth of sunflower.

Lobo D.M.,University Federal do Reconcavo Baiano | Silva P.C.C.,UFRB | do Couto J.L.,Agrarias e Consultor da Fundacao Mokiti Okada | Silva M.A.M.,UFRB | dos Santos A.R.,Solos e Nutricao de Plantas da CCAAB
Bioscience Journal | Year: 2012

The groundnut is a great agricultural alternative for the Northeast region of Brazil, but few studies have been carried out for this crop in relation to its fertilization. Thus, a study was conducted to evaluate the performance and visual characteristics of nutritional deficiency in groundnut (Arachis hypogaea L.) submitted to the absence of N, P, and K. The experiment was conducted in a greenhouse at the Federal University of Bahia Recôncavo, at the Center for Agricultural, Environmental and Biological Sciences, located in Cruz das Almas, BA, from August to October 2010. The experimental design was in randomized blocks, consisting of seven treatments and four replications. The treatments were: T1 - Complete Solution; T2 - Omission of N; T3 - Omission of P; T4 - Omission of K; T5 - Omission of NP; T6 - Omission of PK; and T7 - Omission of NPK. Throughout the crop cycle possible visual aspects of deficiency were assessed. At the end of the experiment, the data were evaluated in height and chlorophyll content. At sixty days after emergence (DAE) plants were collected and partitioned into leaves, stem and root for drying in air forced oven at 65°C until constant weight was obtained to measure the dry mass of shoot and root. Under these experimental conditions the omission of K was not a limiting factor for dry mass of leaves and stem in peanut plants. Phosphorus is an element that proved to be enough for the required growth in height and accumulation of dry mass of leaves and stem. The chlorophyll content of the plant was lower in the treatment in which there was the omission of N. The treatment with omission of NPK was the most limiting, demonstrating the importance of applying these nutrients to the groundnut plants.

Neto C.P.C.T.,EMATER | de Medeiros J.F.,UFERSA | Gheyi H.R.,UFRB | Dias N.S.,UFERSA | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

A study was carried out aiming to investigate management strategies for use of brackish water in the accumulation of dry matter and nutrients in two cultivars of melon (C1 - Sancho and C2 - Medellin) irrigated with low (S1 = 0.61 dS m-1) and high (S2 = 4.78 dS m-1) salinity water in different phases of crop: S1S1S2S2 - T1, S2S1S2S2 - T2, S2S2S1S2 - T3. The 1st, 2nd, 3rd and 4th term correspond, respectively, to different phases - initial growth, flowering, fruit maturation and harvest. Alternate irrigation during the crop cycle, two days of consecutive application with S1 water followed by one day with S2 water (S1 2 days + S2 1day - T4) and irrigation with S2 water throughout the cycle - T5 was also tested. Furthermore, as control, management practice at the farm where the experiment was conducted consisting of irrigation with a mixture of 37% S1 water and 63% of S2 water -T0 was used. The experiment was conducted in a completely randomized design in a 6 × 2 split-plots with four replications. The total dry matter accumulation in shoots of cv. Sancho was greater than Medellín in all management strategies. The nutrients required most by the two cultivars were calcium, potassium and nitrogen.

Dias N.S.,DCAT UFERSA | de Lima F.A.,UFERSA | da Silva C.R.,Federal University of Uberlandia | Neto O.N.S.,UFERSA | Gheyi H.R.,UFRB
Revista Caatinga | Year: 2011

In order to evaluated the impact of the high salinity reject brine from reverse osmosis desalination on hydroponics lettuce cultivated in greenhouse an investigation was carried out in Mossoro, Northeast of Brazil (5°11'S, 37°20'O and 18m above sea). Two lettuce cultivars ('Verônica' and 'Babá de verão') were cultivated with a basic nutrient solution with 1.1 dS m -1 (control) during the crop cycle (1-28 days after transplanting - DAT) - T 0 and with basic nutrient solution containing 50% of the reject water from desalinization with 4.8 dS m -1 exposed during 1-7, 21-28, 7-14 e 1-28 DAT (T 1, T 2, T 3 and T 4, respectively). The addition of 50% of brine reject from desalination into the hydroponic nutrient solution allows grow only 'Veronica' lettuce with no reduction in fresh biomass. This lettuce cultivar shows to be more tolerant to salinity for all exposure time with reject brine in the nutrition solution, despite the fact that 'Babá de Verão' cultivar is more productive.

Primo D.C.,UFRB | de Fadigas F.S.,Campus Universitario Of Cruz Das Almas | Carvalho J.C.R.,Campus Universitario Of Cruz Das Almas | Schmidt C.D.S.,UFRB | Borges Filho A.C.S.,UFRB
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

The use of agroindustrial waste to produce organic compost can result in greater sustainability for agricultural systems. This study aimed to analyze the final quality of the organic compost, according to their nutrients and the presence of active toxic substances. The combinations of ground tobacco stem, bovine manure and rumen (TF+EB+RB), tobacco stem, cattle manure and Microsept Dust (TF+EB+MP) and tobacco stem and cattle manure (TF+EB) were evaluated. Mean samples of each compost were analyzed to determine the concentration of micro and macro nutrients at 60 and 120 days and to verify the nicotine concentration and the presence or absence of pesticide residues in the raw material (TF) and in the composts obtained at 120 days. The data obtained showed high concentrations of potassium (K), nitrogen (N), chloride (Cl) and iron (Fe) in the final compost compared to the other micro and macro nutrients. Neither pesticides in the raw material (TF), nor presence of nicotine in the mean samples obtained within 120 days was detected, demonstrating the absence of environmental impact risks in the agricultural use of these composts. At the end of the composting process, the mixture TF+EB was the one which resulted in an organic compost with the highest concentration in micro and macro nutrients.

de Medeiros D.C.,Federal University of Rio Grande do Norte | de Medeiros J.F.,UFERSA | Barbosa M.A.G.,UFRB | Queiroga R.C.F.,UFERSA | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

The region of Mossoró, RN, Brazil, underwent increasing problems with soil salinity and melon crop yields, mainly in areas with intense evaporation, deficient drainage and inadequate fertilizer use. With this concern, dry mass accumulation in different muskmelon plant organs was evaluated in a trial combining different irrigation water salinity levels and crop growth stages. The experiment was conducted in completely randomized block design with split plot arrangement, having four replications. Five irrigation water salinity levels (0.54, 1.48, 2.02, 3.03 and 3.90 dS m-1) were kept in main plots while the sub plots were assigned to four plant growth stages, represented by sampling during the stages of initial growth, full flowering, full frutification and harvesting stage (15, 30, 45 and 60 days after transplanting, respectively). Growth parameters were all influenced by irrigation water salinity. Water salinity affects the specific leaf area and shoot dry mass varied according to plant growth stage. Variables most affected by irrigation water salinity were leaf area and fruit dry mass, with decrease of 28.9 and 24.6%, respectively. The higher dry mass accumulation of "Pele de Sapo" muskmelon occurred between 30 and 45 days after transplanting.

Sampaio A.H.R.,Federal Institute of Science | Filho M.A.C.,Brazilian National Council for Scientific and Technological Development | Souza L.D.,Brazilian National Council for Scientific and Technological Development | Brito R.B.F.,UFRB | Da Silva R.O.,UFRB
Revista Brasileira de Fruticultura | Year: 2016

This study aimed to evaluate, under field conditions, different combinations between ‘Pera’ sweet orange and eight rootstocks: ‘Rangpur’ lime (RL), ‘Volkamer’ lemon (VL), ‘Cleopatra’ mandarin (CM), ‘Sunki Maravilha’ mandarin (SMM), ‘Indio’ and ‘Riverside’ citrandarins, and VL x RL (‘Rangpur’ lime)-010 and TH-051 hybrids. The soil water matric potential (Ѱm) was characterized for all scion-rootstock combinations at distance of 1.0m from the trunk at the plant row direction and depths of 0.25 m, 0.50 m 0.90 m in the dry and wet seasons. For two years, fruit production parameters and fruit quality were assessed. Differences of Ѱm among scion-rootstock combinations were observed during the dry season (p≤0.05). The lowest Ѱm values for RL and the highest for TH-051 indicate the existence of different intrinsic mechanisms affecting the water extraction of each scion-rootstock combination. Rootstocks have influenced fruit yield and quality (p≤0.05). The best combinations for fruit quality and production were sweet orange grafted on ‘Riverside’, ‘Indio’ and TH-051 rootstocks. © 2016, Sociedade Brasileira de Fruticultura. all rights reserved.

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