Strategies to Improve Nitrogen Use Efficiency in Winter Cereal Crops under Rainfed Conditions

Arregui, Luis M.; Quemada, Miguel

doi:10.2134/agrojnl2007.0187

Cited by 29 publications

(19 citation statements)

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“…Even though fall fertilizer was applied at a relatively small rate (around 45 kg N ha -1 ), it had a significant impact on N export. A closer monitoring of crop growth and synchrony between applied and soil available (mineralized) nutrient supply and demand is necessary to reduce hydrological loss of N in agricultural watersheds (Arregui and Quemada 2008;Quemada et al 2013).…”

Section: Impact Of Watershed Management On Nitrogen Export and Balancesmentioning

confidence: 99%

Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US

et al. 2018

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We constructed a seasonal nitrogen (N) budget for the year 2008 in the Calapooia River Watershed (CRW), an agriculturally dominated tributary of the Willamette River (Oregon, U.S.) under Mediterranean climate. Synthetic fertilizer application to agricultural land (dominated by grass seed crops) was the source of 90% of total N input to the CRW. Over 70% of the stream N export occurred during the wet winter, the primary time of fertilization and precipitation, and the lowest export occurred in the dry summer. Averaging across all 58 tributary subwatersheds, 19% of annual N inputs were exported by streams, and 41% by crop harvest. Regression analysis

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Section: Impact Of Watershed Management On Nitrogen Export and Balancesmentioning

confidence: 99%

Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US

et al. 2018

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“…During the past 50 years Tunisian nitrogen (N) fertilisers consumption increased by 5.14% annually on average till 2013 (Jarrahi et al , ) leading to an average durum wheat yield increase of 33 kg ha −1 year −1 (Latiri et al , ). Therefore, the study of crop responses to N and its agronomic efficiencies is fundamental in order to promote an environmentally friendly use of N fertiliser without hindering production levels (Arregui & Quemada, ). Improved wheat requires large amounts of fertilisers to reach maximum yield and high protein content.…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrogen rates on grain yield and nitrogen agronomic efficiency of durum wheat genotypes under different environments

et al. 2015

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Durum wheat is an important staple food crop in Tunisia and other Mediterranean countries and is grown in various climatic conditions. Production and yield are however severely limited not only by drought events but also by reduced levels of nitrogen fertilisation. A study was carried out at two locations in the sub-humid area of Tunisia: Mateur in 2009-10 and 2010-11 and Beja in 2011-12 and 2012-13 under rainfed conditions. Four durum wheat genotypes (landraces: Bidi, Azizi; improved: Om Rabia, Khiar) were evaluated for nitrogen agronomic efficiency and related agronomic traits under various nitrogen rates: 0, 50, 100, 150, 200 and 250 kg N ha −1 , with three replications. There was a significant interaction effect (P ≤ 0.001) environments × genotypes × N treatments for grain yield (GY), biomass yield (BY), harvest index (HI), partial factor productivity of applied nitrogen (PFP N ) and nitrogen agronomic use efficiencies (NAE). GY was the most affected trait by nitrogen applied showing an increase of 94% under high N treatment (250 kg N ha −1 ) compared to control plots without N treatments. A significant linear regression exists between GY (0 N) and GY for the different N rates (r = 0.70; P < 0.001). This effect was more pronounced for improved genotypes than landraces for all parameters excepting BY and NAE BY . BY showed +11% increase in landraces than improved genotypes. PFP N showed an average decrease of 65% under high-N fertilisation with 10% prevalence for improved genotypes. Landraces tend to promote vegetative growth while grain filling efficiency was higher for improved genotypes.

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“…There are important management differences between growing winter cereals for grain versus forage, including timing and amount of N fertilizer. Studies investigating N needs for wheat or barley grain often split N applications between the fall (at or just after planting) and one or more growth stages in the spring (Alcoz, Hons, & Haby, ; Arregui & Quemada, ; Ayoub, Guertin, Lussier, & Smith, ; Cui, Zhang, Chen, Dou, & Li, ; Delogu et al., ; Ellen & Spiertz, , ). In general for grain production, N is applied at tiller initiation with recommendations for a split application at a later growth stage, such as stem elongation, boot or antithesis, to reduce risk of lodging and increase NUE (Ayoub et al., ; Cui et al., ; Dilz, ; Ellen & Spiertz, ; Sowers, Pan, Miller, & Smith, ).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen response models for winter cereals grown for forage

Lyons

Tang

Booth

et al. 2018

J Agronomy Crop Science

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Forage double cropping can increase production, reduce erosion risk and improve soil health. Farmer experience in the north‐eastern USA shows that winter cereals can, in 3–4 weeks (Feekes 9 harvest), produce high quality forage given sufficient N at dormancy break. Here, we evaluate crop response models to determine the most economic rate of N (MERN) for forage winter cereals. Sixty‐three on‐farm N‐rate trials (0, 34, 67, 101, 135 kg N/ha) were conducted in New York from 2013 to 2016. Trials were divided into four categories: (a) no yield response to N (group 1; 20 trials); (b) yield plateau exceeded the highest N rate (group 2; one trial); (c) the MERN was below the lowest N rate (group 3; seven trials) and (d) all other N‐responsive trials (group 4; 35 trials). For group 4, three statistical models were compared (quadratic plateau, exponential and square root plateau). Statistical, environmental and economic criteria showed that the quadratic plateau fits the data best and had the most stable predictions across scenarios. The four‐category analysis is effective in determining MERNs of individual trials, and the quadratic plateau is best for determining forage winter cereal MERNs and yields at MERNs for individual trials in the north‐eastern USA.

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Strategies to Improve Nitrogen Use Efficiency in Winter Cereal Crops under Rainfed Conditions

Cited by 29 publications

References 0 publications

Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US

Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US

Effects of nitrogen rates on grain yield and nitrogen agronomic efficiency of durum wheat genotypes under different environments

Nitrogen response models for winter cereals grown for forage

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