Effect of different levels of water deficit on rapeseed (Brassica napus L.) crop

Bilibio, Carolina; Carvalho, Jacinto de Assunção; Hensel, Oliver; Richter, Uwe

doi:10.1590/s1413-70542011000400005

Cited by 25 publications

(22 citation statements)

References 20 publications

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“…It is the practice of deliberately under-irrigating crops to reduce water consumption while minimizing adverse effects of extreme water stress on yield (Ayana, 2011). Deficit irrigation does not always decrease yield, as deficits properly applied in some development stages may even increase crop yield (Bilibio et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Mofokeng

Steyn

Plooy³

et al. 2015

South African Journal of Botany

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Water stress is the most limiting factor in agricultural productivity in arid and semi-arid regions and causes very high losses in crop yield. Regulation of growth and stomatal conductance are the main mechanisms by which plants respond to water stress. Pelargonium sidoides is a medicinal plant that grows in South Africa and is used for the treatment of upper respiratory ailments. Cultivation has been considered as a viable means of reducing the pressure on natural populations of this species, but little to no information is available in this regard. Water and nitrogen supply are two of the most important factors that affect growth and yield of plants. This study therefore aimed at investigating the physiological and morphological response, in relation to growth, of P. sidoides to soil water and nitrogen levels. To achieve this objective, P. sidoides plants were grown under a rainshelter and exposed to three irrigation levels (well watered control, moderate water stress, and severe water stress treatment) and four nitrogen levels (0, 50, 100, and 150 kg · N · ha −1 ). Nitrogen and water level had no significant interaction effect on measured parameters. Water stress significantly reduced stomatal conductance, while nitrogen had no significant effect on it. The well watered control had a significantly higher leaf area index, plant height, leaf area, and fresh root yield compared to the water stressed treatments. Nitrogen level had a significant effect on number of leaves, where 100 kg · N · ha −1 had a significantly higher number of leaves compared to other nitrogen treatments. The study provides a first report on the response of P. sidoides to water and nitrogen and showed that the plant responds to water stress by closing its stomata and employing other morphological strategies like reducing plant growth.

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Section: Introductionmentioning

confidence: 99%

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Mofokeng

Steyn

Plooy³

et al. 2015

South African Journal of Botany

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“…Bilibio et al (2011), Dogan et al (2011, Kamkar et al (2011) and Sharghi et al (2011) studied the effects of different levels of water stress (0, 30 and 60% of canola crop evapotranspiration) and found that number of branches, number of pods, dry weight, yield and oil content were significantly affected. Istanbulluoglu et al (2010) evaluated the effect of supplemental irrigation applied at different stages of canola development and found Regarding different levels of nitrogen, we found significant differences in dry weight, thousand grain weight and oil content in 2012 (Table 3).…”

Section: Resultsmentioning

confidence: 99%

Canola yield under different irrigation frequencies and nitrogen levels in the Brazilian Cerrado

2017

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In the Brazilian Cerrado, canola is grown in the off-season. During this period, rainfall is insufficient to ensure the maximum crop yield, and irrigation is needed. Canola has a high demand for nitrogen; thus, the application of this nutrient is essential for obtaining a good crop yield. Therefore, a study was conducted at the Federal University of Grande Dourados in 2012 and 2013 using a randomized block split-plot design with four repetition treatments in the plot that consisted of three irrigation frequencies (no irrigation, weekly irrigation and irrigation three times per week). Subplots received different doses of nitrogen: 0, 30, 60, 90 and 120 kg ha -1 in 2012 and 0, 60, 120, 180 and 240 kg ha -1 in 2013. In both periods, the irrigation frequencies significantly affected plant height, dry weight, grain yield, thousand grain weight and oil content. The nitrogen levels significantly affected dry weight, thousand grain weight and oil content in 2012, as well as plant height, number of pods, dry weight, grain yield and oil yield in 2013. The highest yields were obtained when irrigation was performed three times per week, corresponding to 3,001.84 kg ha -1 in 2012 and 2,516.7 kg ha -1 in 2013.Index terms: Brassica napus L.; oil seeds; tensiometry. RESUMONo Cerrado brasileiro, a canola está sendo cultivada na estação seca, sendo que durante este período a precipitação não é suficiente para garantir o máximo rendimento da cultura, por isso há necessidade de irrigação. A canola tem uma alta demanda de nitrogênio, portanto, a aplicação deste nutriente é essencial para a obtenção de um bom rendimento. Assim, foi realizado um estudo na Universidade Federal de Grande Dourados, em 2012 e 2013, utilizando-se um delineamento de blocos ao acaso com quatro repetições, os tratamentos na parcela composta por três frequências de irrigação (sem irrigação, irrigação semanal e irrigação três vezes por semana). As subparcelas receberam diferentes doses de nitrogênio: 0, 30, 60, 90 e 120 kg ha -1 em 2012; E 0, 60, 120, 180 e 240 kg ha -1 em 2013. Em ambos os períodos, as frequências de irrigação afetaram significativamente a altura da planta, o peso seco, o rendimento de grãos, o peso de mil grãos e o teor de óleo. Os níveis de nitrogênio afetaram significativamente o peso seco, o peso de mil grãos e o teor de óleo em 2012, assim como a altura da planta, o número de vagens, o peso seco, o rendimento de grãos e o rendimento de óleo em 2013. Os maiores rendimentos foram obtidos quando a irrigação foi realizada três vezes por semana, correspondendo a 3.001,84 kg ha-1 em 2012 e 2.516,7 kg ha -1 em 2013.Termos para indexação: Brassica napus L.; sementes oleaginosas; tensiometria.

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“…Valores de tensão de água no solo para a cultura da canola com e sem irrigação ;(R 0,99 e P 0,01) 1 (0,5485 ) Na terceira e última coleta (Tabela 6) os resultados de AP são condizentes, pois, foram encontrados resultados significativos com irrigação superior a 1,2 m (Kirkegaard et al, 2012;EL-Howeity & Asfour, 2012;Dogan et al, 2011) e o NSP é reafirmado por Bilibio et al (2011).…”

Section: Resultsunclassified

Produtividade da canola sob irrigação e doses de adubação nitrogenada

Sanches

Gomes

Ramos

et al. 2014

Rev. bras. eng. agríc. ambient.

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R E S U M OO trabalho foi conduzido no período de maio a setembro de 2012, no Campus da Universidade Federal da Grande Dourados, com o objetivo de avaliar a produtividade e os componentes morfológicos e produtivos da cultura da canola (híbrido Hyola 61) submetidos a diferentes doses de nitrogênio em cobertura e irrigação. O delineamento experimental foi em blocos casualizado em esquema de parcelas subdivididas, com quatro repetições. As parcelas foram constituídas em irrigado e não irrigado. As subparcelas foram constituídas por três tratamentos com adubação nitrogenada em cobertura: 30, 60 e 90 kg ha -1 de nitrogênio. Com o uso da irrigação obtiveram-se os melhores resultados na altura de plantas, massa seca da parte aérea e no número de síliqua por planta. O teor de óleo e a massa de mil grãos apresentaram acréscimos significativos em função da irrigação e das doses de adubação nitrogenada. A produtividade sob irrigação foi superior à não irrigada, com valores iguais a 3145,65 e 1354,45 kg ha -1 , respectivamente. Productivity of canola under irrigation and nitrogen fertilization A B S T R A C TThe study was conducted in the May-September 2012 at the Universidade Federal da Grande Dourados, with the main to evaluate the productivity, morphological and productive components of canola (Hybrid Hyola 61) crop under different levels of nitrogen (topdressing) and irrigation. The experimental design was randomized blocks in a split-plot with four replications. The plots were irrigated and no irrigated. The subplots were three treatments with nitrogen (topdressing) doses of 30, 60 and 90 kg ha -1. With the use of irrigation crop attained better results in plant height, shoot dry mass and number of siliqua per plants. The oil content and thousand grain weights showed significant increases as a function of irrigation and nitrogen doses. The yield under irrigation was higher than nonirrigated, with values equal to 3145.65 and 1354.45 kg ha -1 , respectively. Palavras-chave:Brassica napus L. componentes morfológicos lâmina de irrigação

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Effect of different levels of water deficit on rapeseed (Brassica napus L.) crop

Cited by 25 publications

References 20 publications

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Growth of Pelargonium sidoides DC. in response to water and nitrogen level

Canola yield under different irrigation frequencies and nitrogen levels in the Brazilian Cerrado

Produtividade da canola sob irrigação e doses de adubação nitrogenada

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