Crescimento e Componentes de Produção do Girassol em Função da Irrigação com Água Salina e Adubação Nitrogenada

Ribeiro, Paulo Henrique; Silva, S.; Neto, J. Dantas; Oliveira, Camila Soares de; Chaves, L. H. G.

doi:10.13083/1414-3984/reveng.v23n1p48-56

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…1D). This significant effect of nitrogen doses on plant height is consistent with the results obtained by Biscaro et al (2008) that also observed similar response in sunflower height depending on the doses of N. However, Freitas et al (2012) and Ribeiro et al (2015) did not find significant effects of nitrogen fertilization on sunflower growth. Ivanoff et al (2010), reported that application of N must be divided and provided as close to the stage of development, when plant needs or can use it.…”

Section: Plant Heightsupporting

confidence: 91%

“…The reduction of photosynthesis causes significant growth reduction as few metabolic are produced. Photosynthesis products are essential to nurture and ensure the perpetuation of the species, and not leaving sufficient quantities to be stored, reflected in the low plant growth (Ribeiro et al, 2015). The leaf area as a function of N doses also showed a quadratic fit, despite not having decrease in the adjustment curve, in which the values ranged from 22 to 36 dm 2 at doses of 30 and 120 kg ha -1 N, respectively (Fig.…”

Section: Leaf Areamentioning

confidence: 92%

“…The reduction of total dry biomass and heads to increased water and N doses can theoretically be a reflection of the values observed especially for leaf area and plant height in response to decreased photosynthesis. It leads to the conclusion that exposure to the tested levels cause low production of achenes and make production in areas with low water availability and N unfeasible or uneconomical (Andrade and Abreu, 2007;Ribeiro et al, 2015). Silva et al (2012) observed that the sunflower biomass is significantly affected when the water deficit occurs in different phenological phases.…”

Section: Weight Of Thousand Seeds Per Headmentioning

confidence: 99%

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Growth and biomass of sunflower under different nitrogen levels and available water in the soil of a semi-arid region

Silva¹,

Cardoso²,

Oliveira³

et al. 2017

Aust J Crop Sci

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The adequate water supply and nitrogen in the soil is essential for the growth and development of plants. Sunflower is the target of several studies of such factors due to the economic importance and the needs to expand in the semi-arid regions of Brazil. This work aimed to evaluate the growth variables, measured at 80 days after sowing (DAS), and the biomass obtained at 100 DAS of the Helio 253 sunflower hybrid under the effect of nitrogen and water levels. The experiment was conducted in a greenhouse in the city of Campina Grande-PB, in split-plot of a completely randomized design with four moisture levels in the soil (50, 75, 100 and 125% of available water) and four nitrogen rates (30, 60, 90 and 120 kg ha -1 ). Among all levels of available water in the soil, the stem diameter (SD) ranged from 13.6 to 19.6 mm and the plant height (PH) from 93 to 107 cm. Plants with 100% AW showed a leaf area (LA) 45% greater than the treatment with higher water stress. The heads had an average diameter between 83 and 98 mm, the dry biomass of the heads (DBC) and total dry biomass (TDB) ranged from 45 to 55 g and of 65 to 101 g, respectively. The weight of a thousand seeds per head (W1000) obtained minimum and maximum of 49 and 66 g. The stem diameter ranged between 14.4 to 18.3 mm and the minimum and maximum plant height values were 93 and 110 cm, using applied N levels. The leaf area varied from 22 to 36 dm 2 and the heads had average diameter of 86 to 99 mm. With respect to the dry biomass of the heads, there was a variation of 38 to 68 g and TDB of 68 to 107 g and W1000 valued between 52 and 65 g under doses of N. There is considerable variation in all variables mainly due to increased water level in the soil and nitrogen fertilization.

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Section: Plant Heightsupporting

confidence: 91%

Section: Leaf Areamentioning

confidence: 92%

Section: Weight Of Thousand Seeds Per Headmentioning

confidence: 99%

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Growth and biomass of sunflower under different nitrogen levels and available water in the soil of a semi-arid region

Silva¹,

Cardoso²,

Oliveira³

et al. 2017

Aust J Crop Sci

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“…As condições de déficit hídrico durante a floração levam à redução da fertilização do grão de pólen, devido à desidratação, que pode resultar na redução do peso de mil aquênios (RIBEIRO et al, 2014), o que pode explicar os piores resultados obtidos na lâmina de 274,84 mm para o espaçamento de 0,45 m.…”

Section: Resultsunclassified

CULTIVO DO GIRASSOL (Helianthus annuus L) SOB DIFERENTES LÂMINAS DE ÁGUA E ESPAÇAMENTO EM TANGARÁ DA SERRA – MT

Oliveira

Dallacort

Seabra

et al. 2018

Reveng

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Objetivou-se com esse trabalho avaliar a inﬂuência de lâminas de irrigação e diferentes espaçamentos entre linhas sobre as características produtivas do girassol em Tangará da Serra - MT. O experimento foi conduzido na Universidade do estado de Mato Grosso - UNEMAT, sendo o delineamento experimental adotado o de blocos ao acaso com quatro repetições em esquema fatorial 4 x 3 x 2, sendo quatro lâminas de irrigação (30, 70, 110 e 150% da ET0), três cultivares de girassol (H34, H39 e C42) e dois espaçamentos entre linhas (0,45 e 0,90 m). Foram determinados o diâmetro do capítulo, massa de mil aquênios, produtividade e eficiência no uso da água. A produtividade apresentou diferenças significativas para os efeitos nos níveis de lâminas para as cultivares e também entre os níveis de lâminas para os níveis de espaçamento. Independente da lâmina de água aplicada, as médias das variáveis analisadas no espaçamento de 0,45 m foram superiores ao de 0,90 m. A maior produtividade foi obtida com a lâmina de 369,46 mm (70% da ET0) e espaçamento de 0,45 m, sendo 4758,74 kg ha-1. Contudo, as menores lâminas de água proporcionaram a maior eficiência no uso da água pela cultura.

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“…The concentrations of salts in the irrigation water and/or soil in amounts higher than those tolerated by plants may cause reduction in the soil osmotic potential and thus reduce water availability to plants, besides leading to toxicity and nutritional imbalance (Nobre et al, 2010). Thus, the use of saline water in irrigation is conditioned to the tolerance of the crops to salinity, besides management practices of irrigation and fertilization, which should avoid environmental impacts and consequent damages to the crops (Amorim et al, 2010;Ribeiro et al, 2015). In the productive process, besides the importance of adequate water supply in terms of quantity and quality, fertilization emerges as a preponderant factor to obtain positive result and, among the micronutrients required by plants, N is one of the most important, because it participates in their structure, being a component of amino acids, proteins, enzymes, RNA, DNA, ATP, chlorophyll, among other compounds.…”

Section: Introductionmentioning

confidence: 99%

Quality of soursop (Annona muricata L.) seedlings under different water salinity levels and nitrogen fertilization

Veloso¹,

Nobre²,

Lima³

et al. 2018

Aust J Crop Sci

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The edaphoclimatic characteristics of the Brazilian Northeast region favor the exploitation of soursop, a crop that is appreciated by the population of the whole country. However, due to the water limitation in this region, it is necessary to study techniques that make saline water feasible in the cultivation of the species. The present study aimed to evaluate phytomass production and quality of soursop cv. 'Morada Nova' seedlings, irrigated with waters of different salinity levels and fertilized with nitrogen (N) doses. The experiment was carried out in a greenhouse at the Center of Sciences and Agri-food Technology of the Federal University of Campina Grande (Pombal-PB), using a randomized block experimental design, in 5 x 4 factorial scheme, which corresponded to 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 mg of N dm-3 of soil), with four replicates and two plants per plot. At 90 days after applying the treatments, the following variables were evaluated to assess the quality of the seedlings: fresh and dry phytomass of stem and leaves, dry phytomass of shoots (aerial parts), roots and total, and Dickson's quality index. Irrigation water with ECw of up to 2.0 dS m-1 allows the production of soursop seedlings, cv. 'Morada Nova', with acceptable reduction of growth. The N dose of 70 mg dm-3 stimulates phytomass production and quality of the seedlings. There was no significant interaction between the factors on the studied variables of seedlings at 90 days after application of the treatments. Water of 2.0 dS m-1 associated with nitrogen fertilization using 70 mg of urea dm-3 of soil should be used in the formation of soursop seedlings.

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Crescimento e Componentes de Produção do Girassol em Função da Irrigação com Água Salina e Adubação Nitrogenada

Cited by 3 publications

References 15 publications

Growth and biomass of sunflower under different nitrogen levels and available water in the soil of a semi-arid region

Growth and biomass of sunflower under different nitrogen levels and available water in the soil of a semi-arid region

CULTIVO DO GIRASSOL (Helianthus annuus L) SOB DIFERENTES LÂMINAS DE ÁGUA E ESPAÇAMENTO EM TANGARÁ DA SERRA – MT

Quality of soursop (Annona muricata L.) seedlings under different water salinity levels and nitrogen fertilization

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