2015
DOI: 10.2134/agronj14.0639
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Biologically Fixed Nitrogen in Legume Intercropped Systems: Comparison of Nitrogen‐Difference and Nitrogen‐15 Enrichment Techniques

Abstract: Biological N2 fixation (BNF) via legume intercrops can provide an alternative to inorganic N fertilizer and thereby minimize the economic and environmental costs of bioenergy feedstock and forage production. The objectives of this study were to (i) verify switchgrass (Panicum virgatum L.) as a non‐N2–fixing reference plant for distinguishing between soil‐ and atmosphere‐derived N; (ii) determine BNF levels via the 15N enrichment method for one cool‐season legume (red clover [Trifolium pratense L.]) and three w… Show more

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Cited by 36 publications
(25 citation statements)
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References 38 publications
(66 reference statements)
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“…Percent N and total N in aboveground plant tissue differed among the three tested environmental conditions. In general, the amount of fixed N in pea in this study was relatively lower than previous reports (McCauley et al 2012;Ashworth et al 2015). McCauley reported that the amount of fixed N in pea varied between 74 to 84 kg ha −1 , while Ashworth reported approximately 84 kg ha −1 .…”
Section: Environmental Effects On N Fixationcontrasting
confidence: 76%
“…Percent N and total N in aboveground plant tissue differed among the three tested environmental conditions. In general, the amount of fixed N in pea in this study was relatively lower than previous reports (McCauley et al 2012;Ashworth et al 2015). McCauley reported that the amount of fixed N in pea varied between 74 to 84 kg ha −1 , while Ashworth reported approximately 84 kg ha −1 .…”
Section: Environmental Effects On N Fixationcontrasting
confidence: 76%
“…Intercropping tree legumes (Fabaceae family) with forage grasses in a silvopastoral system can increase the nutrient, mainly nitrogen, content in the soil through biological fixation by legume rhizobia (Ashworth;West, 2015;Xavier et al, 2011). This management practice has been successfully used in the recovery and maintenance of degraded pastures, with known impacts on the soil chemistry and quality (Apolinário et al, 2016;Silva et al, 2013), but no information has been reported about the influence on soil microbial communities.…”
Section: Introductionmentioning
confidence: 99%
“…Biological nitrogen fixation (BNF) and nitrification (stages of N cycling) are directly linked to the action of bacteria and archaea (Canfield;Glazer;Falkowski, 2010). In BNF, atmospheric nitrogen (N 2 ) is converted to ammonium (NH4 + ) in root nodules formed by legume-rhizobia symbiosis (Ashworth et al, 2015) and by the free-living diazotrophic bacteria present in the soil (Wurzburger et al, 2012). N fixation is due to the performance of the enzymatic nitrogenase complex, which catalyses the reduction of dinitrogen (N 2 ) to ammonia (NH 3 ), which is protonated to form NH 4 + (Ipata;Pesi, 2015;Keuter;Veldkamp;Corre, 2014).…”
Section: Introductionmentioning
confidence: 99%
“…Pisum and Vicia are both leguminous species. These legumes may fix anywhere from 35 to 67 kg N ha −1 (Ashworth et al, 2015a(Ashworth et al, , 2015bFlynn and Idowu, 2015). Consequently, increased seed cotton yield under these genera is likely due to additional N produced by legumes.…”
Section: Moderator Impacts On Lint and Seed Yield And Weed Biomass Prmentioning
confidence: 99%