Browsing by Autor "Cleyton dos Santos Fernandes"

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Concentration of Traces Metals in Underground Dams in the Semi-Arid of the Rio Grande do Norte State, Brazil: Case Study of the Sub-Basin of the Cobras River
(Springer Science+Business Media, 2020) Alexandre de Oliveira Lima; Nildo da Silva Dias; Cleyton dos Santos Fernandes; Francisco Pinheiro Lima‐Filho; René Chipana Rivera; Yago Leopoldo Eleuterio Gurgel de Sousa; Líssia Letícia de Paiva Oliveira; José Dárcio Abrantes Sarmento; Hozano de Souza Lemos Neto
Green onion production under strategies of replacement and frequencies of circulation of brackish nutritive solutions
(Federal University of Uberlândia, 2019) Fernando José da Silva Júnior; José Amilton Santos Júnior; Nildo da Silva Dias; Hans Raj Gheyi; René Chipana Rivera; Gerônimo Ferreira da Silva; Cleyton dos Santos Fernandes
The cultivation of vegetables in semi-arid regions, especially in the context of the use of brackish water, has been made possible by the use of the hydroponics technique. Thus, two experiments were carried out between December 2016 and January 2017 in a protected environment at the Federal Rural University of Pernambuco (UFRPE), Recife – PE, Brazil (8° 1”7” South latitude and 34° 56” 53” West longitude, and average altitude of 6.5 m), aiming at evaluating the production of green onion (cv. “Todo dia” Evergreen - Nebuka) in plants exposed to brackish nutrient solution (1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 dS m-1), applied at two frequencies of circulation (twice a day - at 8 and 16 hours, and three times per day - at 8, 12 and 16 hours) in low-cost hydroponics system. In Experiment I, the nutrient solution evapotranspirated by the plants was replaced with the respective brackish water used in its preparation, and in Experiment II with UFRPE supply water (0.12 dS m-1). In both cases, a completely randomized experimental design was used, in a 6 x 2 factorial scheme, with five replications. It was concluded that under replacement with brackish water, the increase in the frequency of circulation attenuated the losses imposed by the salinity to the biometric variables and of the production of fresh and dry phytomass of the plants; the water supply replenishment had a greater mitigating role in relation to the damage caused by the salinity with the increase of the electrical conductivity of the nutrient solution.
Green onion production under strategies of replacement and frequencies of circulation of brackish nutritive solutions
(2019) Fernando José da Silva Júnior; José Amilton Santos Júnior; Nildo da Silva Dias; Hans Raj Gheyi; René Chipana Rivera; Gerônimo Ferreira da Silva; Cleyton dos Santos Fernandes
The cultivation of vegetables in semi-arid regions, especially in the context of the use of brackish water, has been made possible by the use of the hydroponics technique. Thus, two experiments were carried out between December 2016 and January 2017 in a protected environment at the Federal Rural University of Pernambuco (UFRPE), Recife – PE, Brazil (8° 1”7” South latitude and 34° 56” 53” West longitude, and average altitude of 6.5 m), aiming at evaluating the production of green onion (cv. “Todo dia” Evergreen - Nebuka) in plants exposed to brackish nutrient solution (1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 dS m-1), applied at two frequencies of circulation (twice a day - at 8 and 16 hours, and three times per day - at 8, 12 and 16 hours) in low-cost hydroponics system. In Experiment I, the nutrient solution evapotranspirated by the plants was replaced with the respective brackish water used in its preparation, and in Experiment II with UFRPE supply water (0.12 dS m-1). In both cases, a completely randomized experimental design was used, in a 6 x 2 factorial scheme, with five replications. It was concluded that under replacement with brackish water, the increase in the frequency of circulation attenuated the losses imposed by the salinity to the biometric variables and of the production of fresh and dry phytomass of the plants; the water supply replenishment had a greater mitigating role in relation to the damage caused by the salinity with the increase of the electrical conductivity of the nutrient solution.
Irrigation Management Strategies with Brackish Water in Production and Post-harvest Quality of “Toad Skin” Melon
(Springer Science+Business Media, 2021) Cícero Pereira Cordão Terceiro Neto; José Francismar de Medeiros; Nildo da Silva Dias; Hans Raj Gheyi; José Amilton Santos Júnior; René Chipana Rivera; Stella Ribeiro Prazeres Suddarth; Breno Leonan de Carvalho Lima; Cleyton dos Santos Fernandes; Hozano de Souza Lemos Neto
Melon cultivation irrigated with saline waters promote chemical alterations in an acrisol
(Federal University of Uberlândia, 2020) Francisco Aécio Lima Pereira; Hans Raj Gheyi; José Francismar de Medeiros; Nildo da Silva Dias; Cleyton dos Santos Fernandes; René Chipana Rivera
The objective of the present study was to evaluate the salinization process and the changes in the chemical properties of an Acrisol cultivated with melon irrigated with water of different saline concentrations. The experiment was carried out in the field conditions using the experimental design of randomized blocks, arranged in split-plot. The plots were composed of salinity levels of irrigation water, expressed in terms of water electrical conductivity (ECw): 0.54; 1.48; 2.02 dS m-1; and the sub-plots for melon cultivars: Sancho and Medellín (Toad Skin), Mandacaru (Yellow), Nectar (Galia) and Sedna (Cantaloupe). Soil samples were collected at the beginning and end of the crop cycle to evaluate the changes in the physical-chemical properties of the soil. The electrical conductivity of saturation extract in the soil profile varied for each cultivar, observing high salinity values in soils with cultivars with lower water demand (Sedna and Nectar). The salinity of the soil was lower than the electrical conductivity of the irrigation water in the treatments with high values of ECw. The soil pH values showed little reaction in relation to the initial values. The exchangeable sodium percentage values were approximate twice the sodium adsorption ratio of the saturation stratum.
Production of lettuce crop under foliar organo-mineral fertilization and environment
(Federal University of Uberlândia, 2019) Luiz Leonardo Ferreira; Alexandre Igor de Azevedo Pereira; Carmen Rosa da Silva Curvêlo; Francisco Vaniés da Silva Sá; Nildo da Silva Dias; René Chipana Rivera; Cleyton dos Santos Fernandes
The objective of the present work was to evaluate the effect of the organo-mineral foliar fertilization and the environment in the lettuce crop. The work was carried out in a soil classified as Quartzipsamments, with loam texture and low initial availability of nutrients. The experimental design used was randomized blocks with a factorial arrangement 2 x 2 x 5, corresponding to two cultivars of lettuce (Crisp Vanda and Crisp Lucy Brown), two environments (with and without shading mesh at 35%) and five concentrations of Ferti Garden liquid fertilizer multipurpose via foliar, (0; 5; 10; 15 and 20% of the product in the solution), with 4 repetitions, containing 20 plants. Soil preparation was done manually and fertilized with 30 m3 hectare-1 of bovine manure, dead cover was also used. The foliar fertilizer was applied three times, at intervals of seven days, through a constant pressure sprayer, from 12 days after transplanting the seedlings. At 33 days after the transplant the plants were harvested and evaluated in the variables of head diameter, number of leaves, fresh matter and productivity. The cultivar Crisp Lucy Brown proved to be more demanding in terms of luminosity and mineral nutrition in relation to the cultivar Crisp Vanda. Therefore, the highest development and productivity of the Crisp Lucy Brown cultivar is obtained without shading mesh, with fertilization before sowing of 30 kg ha-1 of fowl bed and fertilization with 9.1% of the foliar fertilizer. While for the cultivar Crisp Vanda the highest productivity is obtained with shading mesh, and only with fertilization before sowing.
Production of lettuce crop under foliar organo-mineral fertilization and environment
(2018) Luiz Leonardo Ferreira; Alexandre Igor de Azevedo Pereira; Carmen Rosa da Silva Curvêlo; Francisco Vaniés da Silva Sá; Nildo da Silva Dias; René Chipana Rivera; Cleyton dos Santos Fernandes
The objective of the present work was to evaluate the effect of the organo-mineral foliar fertilization and the environment in the lettuce crop. The work was carried out in a soil classified as Quartzipsamments, with loam texture and low initial availability of nutrients. The experimental design used was randomized blocks with a factorial arrangement 2 x 2 x 5, corresponding to two cultivars of lettuce (Crisp Vanda and Crisp Lucy Brown), two environments (with and without shading mesh at 35%) and five concentrations of Ferti Garden liquid fertilizer multipurpose via foliar, (0; 5; 10; 15 and 20% of the product in the solution), with 4 repetitions, containing 20 plants. Soil preparation was done manually and fertilized with 30 m3 hectare-1 of bovine manure, dead cover was also used. The foliar fertilizer was applied three times, at intervals of seven days, through a constant pressure sprayer, from 12 days after transplanting the seedlings. At 33 days after the transplant the plants were harvested and evaluated in the variables of head diameter, number of leaves, fresh matter and productivity. The cultivar Crisp Lucy Brown proved to be more demanding in terms of luminosity and mineral nutrition in relation to the cultivar Crisp Vanda. Therefore, the highest development and productivity of the Crisp Lucy Brown cultivar is obtained without shading mesh, with fertilization before sowing of 30 kg ha-1 of fowl bed and fertilization with 9.1% of the foliar fertilizer. While for the cultivar Crisp Vanda the highest productivity is obtained with shading mesh, and only with fertilization before sowing.
Variation of the water table and salinity in alluvial aquifers of underground dams in the semi-arid region of Rio Grande do Norte, Brazil
(Federal University of Uberlândia, 2019) Alexandre De O. Lima; Francisco Pinheiro Lima‐Filho; Nildo da Silva Dias; René Chipana Rivera; Miguel Ferreira Neto; Anderson de Souza; Priscila Regina do Aragão Rego; Cleyton dos Santos Fernandes
Despite the growing progress in the construction of underground dams, there are few studies to evaluate and monitor these reservoirs after their construction. Thus, a research study was carried out to evaluate the water table level in alluvial aquifers and water salinity in four underground dams selected in the Cobras river basin, Parelhas municipality, Rio Grande do Norte. Water level variation was monitored using the traditional method and the Ground Penetrating Radar with generation of 3D virtual models. Water samples were collected between the months of December 2010 and December 2011 for electrical conductivity analysis. The results indicate that the accumulation of groundwater and salinity (expressed by electrical conductivity) in the reservoirs were affected by the spatial position within the hydrographic basin (limited occurrence of alluvial aquifer recharge area in headwater sectors) and the presence of surface reservoirs (upstream dams), which promote a more continuous recharge, greater renovation, and reduction of the salinity of the waters of the alluvial aquifer downstream.