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Registros recuperados: 21
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Acúmulo de NPK e sódio na mamoneira sob estresse salino e adubação nitrogenada AGRIAMBI
Nobre,Reginaldo G.; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Lima,Geovani S. de; Lourenço,Givanildo da S.; Soares,Saulo da S..
Objetivou-se, com esta pesquisa, avaliar os efeitos da irrigação com água de diferentes salinidades e doses de nitrogênio, sobre a acumulação de NPK e sódio na parte aérea da mamoneira, em experimento conduzido em lisímetros. Utilizou-se aleatorização em bloco em esquema fatorial 5 x 5, com três repetições, estudando-se os cinco níveis de condutividade elétrica da água (CEa), variando de 0,4 a 4,4 dS m-1, associados a cinco doses de nitrogênio (50 a 150% da recomendada). Os teores de NPK e de sódio na cv. BRS Energia foram maiores nas folhas que no caule e entre as épocas de avaliação, aos 120 dias após a semeadura (DAS) em relação aos 46 DAS. Nas folhas os teores acumulados aos 46 DAS, variou na sequência K > Na > N > P e aos 120 DAS K > N...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ricinus communis L.; Nutrição mineral; Condutividade elétrica.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013001000007
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Aspectos de crescimento e produção da mamoneira irrigada com águas salinas e adubação nitrogenada AGRIAMBI
Lima,Geovani S. de; Nobre,Reginaldo G.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Lourenço,Givanildo da S.; Silva,Saulo S. da.
O trabalho foi desenvolvido objetivando avaliar o crescimento e a produção da mamoneira cv. BRS Energia cultivada em irrigação com água de diferentes níveis salinos e adubada com distintas doses de nitrogênio, em ensaio conduzido em lisímetros de drenagem sob condições de campo no CCTA/UFCG. O delineamento estatístico utilizado foi o de blocos ao acaso, em arranjo fatorial 5 x 4, com três repetições cujos tratamentos constaram de cinco níveis de condutividade elétrica da água - CEa (0,3; 1,2; 2,1; 3,0 e 3,9 dS m-1) e quatro doses de N (70; 100; 130 e 160 mg N kg-1). A irrigação com águas salinas reduziu o crescimento e a produção da mamoneira, observado pela diminuição na altura de planta, diâmetro caulinar, área foliar, fitomassa seca de folhas e de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ricinus communis L.; Salinidade; Nitrogênio.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000600008
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Crescimento de combinações copa - porta-enxerto de citros sob estresse hídrico em casa de vegetação AGRIAMBI
Soares,Lauriane A. dos A.; Brito,Marcos E. B.; Fernandes,Pedro D.; Lima,Geovani S. de; Soares Filho,Walter dos S.; Oliveira Filho,Eliamara S. de.
Neste trabalho se propôs identificar combinações entre variedades copas e porta-enxertos que apresentem melhores respostas ao estresse hídrico, desde o crescimento inicial até o início da floração. Utilizou-se o delineamento experimental em blocos casualizados, em esquema fatorial (4 x 2 x 2), sendo quatro níveis de água [50, 75, 100 (testemunha) e 125% da evapotranspiração real aplicados em duas variedades copa de citros enxertadas em dois porta-enxertos: limoeiro 'Cravo Santa Cruz' (Citrus limonia Osbeck) e híbrido trifoliado HTR-069. A redução na lâmina de água aplicada comprometeu o crescimento em número de folhas, diâmetro de caule do porta-enxerto, diâmetro de caule na linha de enxertia e diâmetro de caule da copa tal como a fitomassa seca da parte...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus spp.; Poncirus trifoliata; Déficit hídrico; Irrigação.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000300211
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Crescimento e componentes de produção da mamoneira sob estresse salino e adubação nitrogenada REA
Lima,Geovani S. de; Nobre,Reginaldo G.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Silva,Alexsandro O. da.
Esta pesquisa foi realizada com o propósito de avaliar o crescimento e os componentes de produção da mamoneira cv. BRS Energia sob diferentes níveis de salinidade da água de irrigação e de doses de nitrogênio em condições de campo, no Neossolo Regolítico eutrófico típico de textura franco-arenosa, no município de Pombal - PB, em delineamento de blocos ao acaso, testando-se cinco níveis de salinidade da água de irrigação-CEa (0,4-controle, 1,4; 2,4; 3,4 e 4,4 dS m-1) e cinco doses de N (50; 75; 100; 125 e 150 mg kg-1), em esquema fatorial 5 x 5, com três repetições. O aumento da CEa, a partir de 0,4 dS m-1, promoveu redução do número de folhas (NF), da altura de planta (AP), do diâmetro de caule (DC), da massa seca da parte aérea (MSPA), do comprimento do...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ricinus communis; Água salina; Nitrogênio.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000500005
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Cultivation of CNPA G3 sesame irrigated with saline water and fertilized with nitrate-N and ammonium-N AGRIAMBI
Lima,Geovani S. de; Dias,Adaan S.; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Camara Neto,José P.; Oliveira,Luan D. de.
ABSTRACT The study aimed to evaluate the effects of irrigation with saline water and fertilization with nitrate (NO3--N) and ammonium (NH4+-N) ratios on growth, flowering, water consumption and water use efficiency of the sesame cv. CNPA G3. The treatments were distributed in randomized blocks in a 5 x 5 factorial with three replicates, referring to five levels of electrical conductivity of the irrigation water - ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m-1) and nitrate (NO3--N) and ammonium (NH4+-N) (200/0, 150/50, 100/100, 50/150, 0/200 mg kg-1) ratios. Irrigation with saline water above 0.6 dS m-1 inhibited the growth, delayed flowering and promoted early maturation of capsules of sesame, cv. CNPA G3. The proportion of 0/200 mg kg-1 of NO3--N/NH4+-N promoted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sesamum indicum L.; Salt stress; NO3--N and NH4+-N ratios.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100014
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Fitomassa e produção do girassol cultivado sob diferentes níveis de reposição hídrica e adubação potássica AGRIAMBI
Soares,Lauriane A. dos A.; Lima,Geovani S. de; Chaves,Lucia H. G.; Xavier,Diego A.; Fernandes,Pedro D.; Gheyi,Hans R..
Na região semiárida do Nordeste do Brasil a reduzida disponibilidade hídrica e a ocorrência de solos pouco férteis, principalmente em potássio, estão entre os fatores que mais têm limitado a produção agrícola. Neste sentido objetivou-se, com este trabalho, avaliar a fitomassa e a produção do girassol cv. ‘Hélio 251’ em função da irrigação com diferentes níveis de reposição hídrica e adubação potássica sob condições de ambiente protegido do Centro de Tecnologia e Recursos Naturais da UFCG, Campina Grande, PB. Usou-se o delineamento estatístico de blocos casualizados estudando-se cinco níveis de reposição hídrica (40, 60, 80 100 (testemunha) e 120% da evapotranspiração real-ETr) associada a doses de adubação potássica (50; 75; 100; 125 e 150% da recomendação...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L.; Lâminas de irrigação; Potássio.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000400336
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Formation of ‘Crioula’ guava rootstock under saline water irrigation and nitrogen doses AGRIAMBI
Souza,Leandro de P.; Nobre,Reginaldo G.; Silva,Evandro M. da; Lima,Geovani S. de; Pinheiro,Francisco W. A.; Almeida,Luana L. de S..
ABSTRACT The objective of this research was to evaluate the growth and formation of fresh and dry weight of ‘Crioula’ guava rootstock irrigated with waters of different saline levels and nitrogen (N) doses, in an experiment conducted in plastic tubes under greenhouse conditions. The experimental design was randomized blocks, in a 5 x 4 factorial scheme with four replicates, and the treatments consisted of five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the cultivation of guava seedlings, cv. ‘Paluma’). The dose referring to 100% corresponds to 773 mg of N dm-3. The highest growth of ‘Crioula’ guava rootstock was obtained with ECw of 0.3 dS m-1 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Psidium guajava L.; Water electrical conductivity; Nitrogen.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800739
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Gas exchanges and growth of passion fruit under saline water irrigation and H2O2 application AGRIAMBI
Andrade,Elysson M. G.; Lima,Geovani S. de; Lima,Vera L. A. de; Silva,Saulo S. da; Gheyi,Hans R.; Silva,André A. R. da.
ABSTRACT The study was carried out to evaluate the photosynthetic efficiency and growth of yellow passion fruit, cultivated under different levels of irrigation water salinity and exogenous application of hydrogen peroxide. The experiment was carried out in greenhouse of the Universidade Federal de Campina Grande, PB, Brazil, using drainage lysimeters with capacity for 100 dm3, filled with Entisol of sandy texture. The experimental design was randomized blocks using a 4 x 4 factorial scheme, with three repetitions, corresponding to four water salinity (0.7; 1.4; 2.1 and 2.8 dS m-1) and four concentrations of hydrogen peroxide (0, 20, 40 and 60 µM). The different concentrations of hydrogen peroxide were applied by soaking the seed for a period of 24 h and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Passiflora edulis; Antioxidant enzyme; Salinity.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200945
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Gas exchanges and photochemical efficiency of West Indian cherry cultivated with saline water and potassium fertilization AGRIAMBI
Dias,Adaan S.; Lima,Geovani S. de; Sá,Francisco V. da S.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Fernandes,Pedro D..
ABSTRACT The problem of the lack of adequate water resources for agriculture has intensified in recent years, making it necessary to use waters with relatively high concentration of salts for the irrigation of crops all over the world. The objective of this study was to evaluate the influence of potassium (K) fertilization as a salt stress attenuator on gas exchanges and photochemical efficiency of West Indian cherry. The crop was cultivated under greenhouse conditions in the municipality of Campina Grande, PB, in lysimeters filled with 250 kg of sandy loam soil. Treatments were distributed in randomized blocks, in a 2 x 4 factorial scheme, with two levels of electrical conductivity of irrigation water - ECw (0.8 and 3.8 dS m-1) and four K doses (50, 75,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malpighia emarginata; Saline stress; Physiology; Fruit crops.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000900628
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Growth and fiber quality of colored cotton under salinity management strategies AGRIAMBI
Soares,Lauriane A. dos A.; Fernandes,Pedro D.; Lima,Geovani S. de; Suassuna,Janivan F.; Brito,Marcos E. B.; Sá,Francisco V. da S..
ABSTRACT Using saline water in the agricultural activity has become a reality in several regions of the world. Due to the increase in the demand for fresh water, it is necessary to use cultivation strategies and genotypes tolerant to saline stress to make the production viable. In this context, effects of irrigation management strategies with low-salinity water (0.8 dS m-1) and high-salinity water (9.0 dS m-1) were evaluated, varying the phenological stages of the plants, on the growth and fiber quality of colored cotton. Three cotton cultivars submitted to seven irrigation management strategies were used, constituting a 3 x 7 factorial scheme, in a randomized block design with three replicates, in plots and in protected environment. Saline water...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gossypium hirsutum L.; Saline stress; Phenological stages.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000500332
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Growth and gas exchanges in soursop under irrigation with saline water and nitrogen sources AGRIAMBI
Silva,Evandro M. da; Lima,Geovani S. de; Gheyi,Hans R.; Nobre,Reginaldo G.; Sá,Francisco V. da S.; Souza,Leandro de P..
ABSTRACT Nitrogen (N) fertilization has been tested for the mitigation of salt stress in some species including fruit crops. However, special attention should be paid to the source of N, due to the different compositions and saline indices of the fertilizers, particularly when irrigation is conducted using waters with salinity levels that are restrictive to agriculture. Thus, this study evaluated the effect of fertilization with N sources on the growth and gas exchanges of soursop irrigated with saline water after transplanting. The experiment was carried out in greenhouse at the Center of Technology and Natural Resources of the Federal University of Campina Grande, and treatments were arranged in randomized blocks, in 4 x 4 factorial scheme, corresponding...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Annona muricata L.; Salinity; Nitrogen; Photosynthesis.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100776
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Growth and production components of West Indian cherry cultivated with saline waters and potassium fertilization AGRIAMBI
Lima,Geovani S. de; Pinheiro,Francisco W. A.; Dias,Adaan S.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Silva,Saulo S. da.
ABSTRACT Due to water limitations in terms of both quantity and quality in the semi-arid region of northeastern Brazil, the use of waters with high concentrations of salts become necessary in irrigated agriculture. Thus, this study aimed to evaluate the growth and production of grafted West Indian cherry under saline water irrigation and potassium fertilization. The experiment was carried out in drainage lysimeters under protected environment conditions, using a Regolithic Neosol with sandy loam texture. Treatments resulted from the combination of two levels of electrical conductivity - ECw (0.8 and 3.8 dS m-1) of irrigation water and four doses of potassium (50, 75, 100 and 125% of the recommendation of Musser), arranged in a randomized block design, with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malpighia emarginata; Salt stress; Osmoregulation.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400250
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Growth and yield of colored-fiber cotton grown under salt stress and nitrogen fertilization AGRIAMBI
Lima,Geovani S. de; Dias,Adaan S.; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Nobre,Reginaldo G.; Souza,Leandro de P..
ABSTRACT This research was conducted in order to evaluate the growth and production of colored-fiber cotton, cv. ‘BRS Rubi’, irrigated with water of different salinities and nitrogen (N) doses. The experiment was carried out in drainage lysimeters filled with soil material from an eutrophic Regolithic Neosol with sandy-loam texture under greenhouse conditions in Campina Grande, PB. The experiment was conducted in a randomized block design and the treatments consisted of five levels of irrigation water salinity with the following electrical conductivities - ECw (5.1, 6.1, 7.1, 8.1 and 9.1 dS m-1), combined with five N doses - ND (65; 100; 135; 170; 205 mg of N kg-1 of soil), distributed in a 5 x 5 factorial scheme with three replicates. The growth of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gossypium hirsutum L.; Saline water; Nitrogen; BRS Rubi.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600415
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Morphophysiology of guava under saline water irrigation and nitrogen fertilization AGRIAMBI
Bezerra,Idelfonso L.; Nobre,Reginaldo G.; Gheyi,Hans R.; Souza,Leandro de P.; Pinheiro,Francisco W. A.; Lima,Geovani S. de.
ABSTRACT The aim of this study was to evaluate the growth of grafted guava cv. ‘Paluma’ subjected to different concentrations of salts in irrigation water and nitrogen (N) fertilization. The plants were transplanted to 150 L lysimeters and under field conditions at the Science and Agri-food Technology Center of the Federal University of Campina Grande, in the municipality of Pombal - PB. The experiment was conducted in randomized block design in a 5 x 4 factorial scheme, with three replicates, and the treatments corresponded to five levels of electrical conductivity of irrigation water - ECw (0.3; 1.1; 1.9; 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the crop). The doses equivalent to 100% corresponded to 541.1...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Psidium guajava L.; Electrical conductivity; Nitrogen.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100032
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Nutrient contents and growth of corn fertigated with human urine and cassava wastewater AGRIAMBI
Araújo,Narcísio C. de; Lima,Vera L. A. de; Lima,Geovani S. de; Andrade,Elysson M. G.; Ramos,Jailton G.; Oliveira,Suenildo J. C..
ABSTRACT This study aimed to evaluate the contents of macronutrients (NPK and S) and the growth of ‘Potiguar’ corn fertigated with human urine, cassava wastewater and their associations with NPK. The experiment was set up in greenhouse located on Campus I of Universidade Federal de Campina Grande. A completely randomized experimental design was used, consisting of eight treatments, corresponding to fertigation with mineral fertilizer NPK formula; organic, composed of yellow water, cassava wastewater and human urine associated with cassava wastewater; organomineral, composed of human urine associated with phosphorus and potassium, cassava wastewater associated with nitrogen and phosphorus and human urine associated with cassava wastewater and phosphorus,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays L.; Agricultural use of waste; Eco-sanitation; Yellow waters.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000900681
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Potassium fertilization in the cultivation of colored cotton irrigated with saline water AGRIAMBI
Silva,André A. R. da; Lima,Geovani S. de; Azevedo,Carlos A. V. de; Soares,Lauriane A. dos A.; Gheyi,Hans R.; Oliveira,Raucha C. de.
ABSTRACT The objective of this study was to evaluate growth, flowering and production components of the cotton cv. ‘BRS Topázio’ irrigated with water of different salinity levels and potassium (K) doses in the soil. The research was conducted in a greenhouse. The experiment was set in a randomized complete block design with four replicates, in 4 x 4 factorial arrangement with 4 levels of irrigation water salinity (1.5, 3.0, 4.5 and 6.0 dS m-1) and four K doses (50, 75, 100 and 125% of the recommendation); the dose of 100% corresponded to 150 mg K2O kg-1 of soil. Irrigation water salinity reduced stem diameter, plant height, number of leaves and leaf area of the cotton cv. ‘BRS Topázio’. Leaf area at 53 DAS was the most affected variable. The highest K dose...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gossypium hirsutum L.; ‘BRS Topázio’; Salt stress; Potassium.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900628
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Saline-sodic soil treated with gypsum, organic sources and leaching for successive cultivation of sunflower and rice AGRIAMBI
Santos,Petrônio D. dos; Cavalcante,Lourival F.; Gheyi,Hans R.; Lima,Geovani S. de; Gomes,Everaldo M.; Bezerra,Francisco T. C..
ABSTRACT Correction of saline and sodic soils aims to reduce salts dissolved in the solution and exchangeable sodium, respectively, to allow the growth and production of crops. In this context, an experiment was carried out between August/2011 and September/2012, in saline-sodic soil of the Irrigated Perimeter of São Gonçalo, in the municipality of Sousa, PB, Brazil. Agricultural gypsum, organic sources and continuous leaching for reducing salinity, sodicity and alkalinity in the saline-sodic soil and their effects on the production of the sunflower cultivar Embrapa 122/V-2000 and the rice variety Diamante were evaluated. The treatments were distributed in four randomized blocks and the soil was subjected to continuous leaching for 50 days and evaluated...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus; Correction of sodicity; Salinity; Soil conditioners.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200891
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Salinity and cationic nature of irrigation water on castor bean cultivation AGRIAMBI
Lima,Geovani S. de; Nobre,Reginaldo G.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Azevedo,Carlos A. V. de; Lima,Vera L. A. de.
ABSTRACT This study aimed to evaluate the water relations, cell damage percentage and growth of the castor bean cv. ‘BRS Energia’ as a function of salinity and cationic nature of the water used in irrigation. The experiment was conducted in drainage lysimeters under greenhouse conditions in eutrophic Grey Argisol of sandy loam texture. Six combinations of water salinity and cations were studied (S1 - Control; S2 - Na+, S3 - Ca2+, S4 - Na+ + Ca2+; S5 - K+ and S6 - Na+ + Ca2+ + Mg2+), in a randomized block design with four replicates. In the control (S1), plants were irrigated with 0.6 dS m-1 water, whereas the other treatments received 4.5 dS m-1 water, obtained by adding different salts, all in the chloride form. Higher relative water content in the leaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ricinnus communis (L.); Semi-arid region; Water shortage.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400267
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Salt stress and exogenous application of hydrogen peroxide on photosynthetic parameters of soursop AGRIAMBI
Silva,André A. R. da; Lima,Geovani S. de; Azevedo,Carlos A. V. de; Veloso,Luana L. de S. A.; Gheyi,Hans R.; Soares,Lauriane A. dos A..
ABSTRACT This study aimed to evaluate the gas exchanges and photosynthetic pigments of soursop seedlings cv. ‘Morada Nova’ irrigated with saline waters and subjected to exogenous application of hydrogen peroxide by seed soaking and foliar spraying. The study was carried out using plastic bags under greenhouse conditions at the Center of Technology and Natural Resources of the Federal University of Campina Grande, PB, Brazil, using a eutrophic Regolithic Neosol of sandy loam texture. Treatments were arranged in a randomized block design, in 5 x 5 factorial scheme, which consisted of five levels of electrical conductivity – ECw (0.7; 1.4; 2.1; 2.8 and 3.5 dS m-1) of irrigation water and five concentrations of hydrogen peroxide - H2O2 (0, 25, 50, 75 and 100...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Annona muricata L.; Saline waters; Physiology.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400257
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Sources and doses of nitrogen in the production of sunflower plants irrigated with saline water AGRIAMBI
Nobre,Reginaldo G.; Sousa,Welligton B. da; Lima,Geovani S. de; Gheyi,Hans R.; Dias,Adaan S.; Pinheiro,Francisco W. A..
ABSTRACT The cultivation of sunflower allows its use as bio-fuel and alternative forage. It is a viable alternative in the semiarid regions. Current study evaluates the effect of saline water use, sources and doses of nitrogen fertilization on the production of sunflower in the experiment conducted in drainage lysimeters between May and August 2012, under protected conditions, at Pombal - PB Brazil. The experiment consisted of a randomized block design, with a 2 x 3 x 4 factorial arrangement and three replications. The treatments consisted of two levels of electrical conductivity of water - ECw (0.3 and 3.0 dS m-1), three sources of nitrogen (urea, ammonium sulfate and calcium nitrate) and four levels of N (40, 80, 120 and 160% of recommended dose - 100 mg...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L.; Electrical conductivity of water; Mineral nutrition.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014001300059
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