The effects of irrigation regimes and nitrogen rates on some agronomic traits of canola under a semiarid environment

Kamkar, Behnam; Daneshmand, A R; Behjou, Farshad Keivan; Shiranirad, A H; Langeroudi, A R Safahani

doi:10.1016/j.agwat.2011.01.009

Cited by 35 publications

(35 citation statements)

References 17 publications

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“…Increased application of nitrogen in the current study also led to an increase in dry matter production. Increased application of nitrogen could further increase dry matter production in canola under various moisture regimes (Kamkar et al, 2011). The true nature of nitrogen impact is its influence on photosynthesis and CO 2 assimilation (Kappen et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Changes in enzymatic and nonenzymatic antioxidant defense mechanisms of canola seedlings at different drought stress and nitrogen levels

Ahmadi¹,

Ebadi²,

Jahanbakhsh³

et al. 2015

Turk J Agric For

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To evaluate the responses of canola seedlings to different levels of drought stress and nitrogen at different growth stages, a factorial experiment was conducted in a completely randomized design with three replications at the experimental greenhouse of Mohaghegh Ardabili University in 2013. Treatments included three levels of drought stress (30%, 50%, and 70% of FC) and five levels of nitrogen (control, based on soil test results; 25% less than the recommended level; 50% less than the recommended level; 25% more than the recommended level; and 50% more than the recommended level). The recommended level of nitrogen, based on soil test results, was 0.09 g of nitrogen per kilogram of soil. Results showed that drought stress, nitrogen, and their interaction significantly affected the enzymatic activity of antioxidant catalase (CAT), polyphenol oxidase (PPO), and peroxidase (PO) at various stages of growth. Proline was also affected by drought stress and nitrogen. Maximum CAT activity (794.04 OD mg protein min -1 ) was observed at the 4-6 leaf stage under mild drought stress conditions (50% of FC) and a nitrogen application rate 50% less than the recommended level. Increased rates of nitrogen enhanced the PPO activity at the 4-6 and 6-8 leaf stages. PO had a negative response to increased rates of nitrogen application. The highest rate of increase in proline was at the 8-10 leaf stage: 205% and 207% higher under mild drought stress (50% of FC) and severe drought stress (30% of FC) conditions, respectively, compared to favorable moisture conditions (70% of FC). Increased nitrogen application led to an increase in proline production at all stages of sampling (4-6, 6-8, and 8-10 leaf stages).

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Section: Discussionmentioning

confidence: 99%

Changes in enzymatic and nonenzymatic antioxidant defense mechanisms of canola seedlings at different drought stress and nitrogen levels

Ahmadi¹,

Ebadi²,

Jahanbakhsh³

et al. 2015

Turk J Agric For

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“…With higher doses of nitrogen, 60 kg ha -1 , ElHoweity and Asfour (2012) obtained a higher number of pods per plant and of thousand grain weight. According to Beaudette et al (2010), the best yield results are achieved with a nitrogen level of 80 kg N ha -1 , whereas Dogan et al (2011) and Kamkar et al (2011) obtained higher yields with levels above 180 kg N ha -1 under irrigation. Canola is sensitive to water stress during periods of flowering and grain filling (Dogan et al, 2011;Mohammadi;Rokhzadi, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Canola grains generally contain 38 to 50% oil (Beaudette et al, 2010;Mohammadi;Rokhzadi, 2012;Pavlista et al, 2011). Regarding thousand grain weight, SANCHES, A. C. et al the literature reports values of 2.5 to 3.8 g (Dogan et al, 2011;Kamkar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen is essential to achieve canola yield potential (Hamzei;Soltani, 2012;Kaefer et al, 2014;Kamkar et al, 2011). With higher doses of nitrogen, 60 kg ha -1 , ElHoweity and Asfour (2012) obtained a higher number of pods per plant and of thousand grain weight.…”

Section: Introductionmentioning

confidence: 99%

“…However, other authors have reported yields above 4,000 kg ha -1 (Dogan et al, 2011;Kamkar et al, 2011). As few research studies have been performed with canola grown off-season in the Brazilian center-west region, we assessed crop yield potential under different irrigation frequencies and nitrogen levels over two years.…”

Section: Introductionmentioning

confidence: 99%

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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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Nitrogen availability impacts oilseed rape (Brassica napus L.) plant water status and proline production efficiency under water-limited conditions

Albert

Cahérec

Niogret

et al. 2012

Planta

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Large amounts of nitrogen (N) fertilizers are used in the production of oilseed rape. However, as low-input methods of crop management are introduced crops will need to withstand temporary N deficiency. In temperate areas, oilseed rape will also be affected by frequent drought periods. Here we evaluated the physiological and metabolic impact of nitrate limitation on the oilseed rape response to water deprivation. Different amounts of N fertilizer were applied to plants at the vegetative stage, which were then deprived of water and rehydrated. Both water and N depletion accelerated leaf senescence and reduced leaf development. N-deprived plants exhibited less pronounced symptoms of wilting during drought, probably because leaves were smaller and stomata were partially closed. Efficiency of proline production, a major stress-induced diversion of nitrogen metabolism, was assessed at different positions along the whole plant axis and related to leaf developmental stage and water status indices. Proline accumulation, preferentially in younger leaves, accounted for 25–85 % of the free amino acid pool. This was mainly due to a better capacity for proline synthesis in fully N-supplied plants whether they were subjected to drought or not, as deduced from the expression patterns of the proline metabolism BnP5CS and BnPDH genes. Although less proline accumulated in the oldest leaves, a significant amount was transported from senescing to emerging leaves. Moreover, during rehydration proline was readily recycled. Our results therefore suggest that proline plays a significant role in leaf N remobilization and in N use efficiency in oilseed rape.Electronic supplementary materialThe online version of this article (doi:10.1007/s00425-012-1636-8) contains supplementary material, which is available to authorized users.

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The effects of irrigation regimes and nitrogen rates on some agronomic traits of canola under a semiarid environment

Cited by 35 publications

References 17 publications

Changes in enzymatic and nonenzymatic antioxidant defense mechanisms of canola seedlings at different drought stress and nitrogen levels

Changes in enzymatic and nonenzymatic antioxidant defense mechanisms of canola seedlings at different drought stress and nitrogen levels

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

Nitrogen availability impacts oilseed rape (Brassica napus L.) plant water status and proline production efficiency under water-limited conditions

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