Understanding the variability in soybean nitrogen fixation across agroecosystems

Schipanski, Meagan; Drinkwater, Laurie E.; Russelle, Michael P.

doi:10.1007/s11104-009-0165-0

Cited by 99 publications

(93 citation statements)

References 66 publications

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“…The similar data were obtained when crops growth at specific landscape positions is influenced by several interacting hill slope process across a typical soil arena (Schipanski et al 2010;Snapp and Kravchenko, 2015;Russenes et al 2016). Influence of landscape position and terrain attributes an annual crop yield has been studied.…”

Section: Introductionsupporting

confidence: 52%

Crops Adaptation Management in the Conditions of Steppe Landscape of Ukraine

Kharytonov¹,

Velychko²

2017

AgricultForest

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SUMMARYPreformed study approved for studied crops the dependency between crop nutrient uptake and concentration as well the impact of landscape positions, adaptation potential of species, varieties and hybrids occurrence. Perennial legumes (alfalfa, sainfoin) were more unpretentious. Pea varieties are moderately pretentious appeared to be better than cereal crops -megatrophs (barley, corn) in terms of edification for growing on slopes. The consumption of nutrients for the production of 1 ton of corn grain and relative quantity of byproducts was lower for the slope of the southern position than for the flat and the northern hill slope of the landscape position. The uneven appearance of the resource potential factors for eroded lands dictates the need for differentiated use of arable lands.

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Section: Introductionsupporting

confidence: 52%

Crops Adaptation Management in the Conditions of Steppe Landscape of Ukraine

Kharytonov¹,

Velychko²

2017

AgricultForest

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“…The intercropping of gliricidia, maize, and cowpea produced the highest amounts of aboveground biomass in the previous years (Martins et al, 2013) and probably also the highest amounts of belowground biomass. The decomposition of this biomass could increase the availability of mineral N, and it has been shown that high N availability reduces N fixation (Schipanski et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Nitrogen symbiotically fixed by cowpea and gliricidia in traditional and agroforestry systems under semiarid conditions

Martins

Freitas

Menezes

et al. 2015

Pesq. agropec. bras.

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-The objective of this work was to estimate the amounts of N fixed by cowpea in a traditional system and by cowpea and gliricidia in an agroforestry system in the Brazilian Northeast semiarid. The experiment was carried out in a randomized complete block design, in a split-plot arrangement, with four replicates, in the semiarid region of the state of Paraíba, Brazil. Plots consisted of agroforestry and traditional systems (no trees), and split-plots of the three crops planted between the tree rows in the agroforestry system. To estimate N fixation, plant samples were collected in the fourth growth cycle of the perennial species and in the fourth planting cycle of the annual species. In the agroforestry system with buffel grass and prickly-pear cactus, gliricidia plants symbiotically fix high proportions of N (>50%) and contribute with higher N amounts (40 kg ha -1 in leaves) than in the traditional system (11 kg ha -1 in grain and 18 kg ha -1 in straw). In the agroforestry system with maize and cowpea, gliricidia plants do not fix nitrogen, and N input is limited to the fixation by cowpea (2.7 kg ha -1 ), which is lower than in the traditional system due to its lower biomass production.Index terms: Gliricidia sepium, Vigna unguiculata, biological nitrogen fixation, natural abundance, 15 N. Nitrogênio fixado simbioticamente por feijão-caupi e gliricídia em sistemas tradicional e agroflorestal sob condições semiáridasResumo -O objetivo deste trabalho foi estimar as quantidades de N fixadas em feijão-caupi em sistema tradicional e em feijão-caupi e gliricídia em sistema agroflorestal, sob condições semiáridas do Nordeste brasileiro. O experimento foi conduzido em blocos ao acaso, em arranjo em parcelas subdivididas, com quatro repetições, no semiárido da Paraíba. As parcelas consistiram dos sistemas agroflorestal e tradicional (sem árvores), e as subparcelas, dos três cultivos entre as linhas das árvores, no sistema agroflorestal. Para estimar a fixação de N, amostras das plantas foram coletadas no quarto ciclo de crescimento das espécies perenes e no quarto ciclo de cultivo das espécies anuais. No sistema agroflorestal com capim-buffel e palma forrageira, a gliricídia fixa simbioticamente altas proporções de N (>50%) e adiciona quantidades maiores de N (40 kg ha -1 nas folhas) que no sistema tradicional (11 kg ha -1 nos grãos e 18 kg ha -1 na palhada). No sistema agroflorestal com milho e feijão-caupi, a gliricídia não fixa N e a adição de N é limitada à fixação no feijão-caupi (2,7 kg ha -1 ), que é menor que no sistema tradicional em razão da sua baixa produção de biomassa.Termos para indexação: Gliricidia sepium, Vigna unguiculata, fixação biológica do nitrogênio, abundância natural, 15 N.

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“…Soybeans can also meet their N needs from soil inorganic N pools. Because BNF is energy intensive (Silsbury 1977), soybeans are expected to favor inorganic N uptake when N availability in soil increases (Peoples et al 1995b;Schipanski et al 2010). This expectation for a changing contribution of BNF to the aboveground biomass has been tested in field studies.…”

Section: Introductionmentioning

confidence: 99%

A reassessment of the contribution of soybean biological nitrogen fixation to reactive N in the environment

Gelfand

Robertson

2014

Biogeochemistry

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The expansion of soybean (Glycine max (L.) Merr) acreage, increasing yields, and recent nitrogen (N) fertilization recommendations could have a major effect on the contribution of biological N fixation (BNF) in soybeans to reactive nitrogen (N r ) in the environment. We used 15 N natural abundance to separate fixed N into grain, aboveground vegetative biomass, and roots along a 9-point N-fertilizer gradient to ask: 1) is the belowground BNF contribution sufficiently different from aboveground to affect regional estimates of soybean N r production based on harvested biomass, and 2) how does N fertilizer affect soybean yield and BNF's contribution to different tissues? The contribution of root and vegetative biomass to overall plant BNF was five times lower than that for grain. Including this difference in BNF extrapolations translates to 3.5 ± 0.5 Tg N r yr -1 for total US soybean production, *37 % lower than earlier estimates that did not differentiate tissue source. Production of N r ranged between 35 ± 11 and 73 ± 5 g Nr kg -1 grain and was affected by both fertilization and irrigation. In all cases N credits to the next rotational crop were minor. N-fertilization at even very low levels (17-50 kg N ha -1 ) did not affect yield, but grain N content increased with fertilizer level. The percent BNF contributed to plant N decreased linearly with increasing fertilization, in grain from 49 ± 8 % in unfertilized plots to a plateau of 16 ± 6 % at fertilization C85 kg N ha -1 ; in aboveground vegetative biomass from 77 ± 4 % to a plateau of 11 ± 11 % at 146 kg N ha -1 ; and in roots from 88 ± 12 % to a plateau of 41 ± 6 % at 146 kg N ha -1 . The average whole-plant BNF contribution decreased from *84 % in unfertilized plots to a plateau of *34 % at fertilization rates greater than 84 kg ha -1 . Results underscore the unnecessary expense and environmental burden of adding N fertilizer to modern soybean varieties, and provide a refined lower estimate for the contribution of soybean N fixation to the US and global N r budgets of 3.5 and 10.4 Tg Nr yr -1 , respectively.

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Understanding the variability in soybean nitrogen fixation across agroecosystems

Cited by 99 publications

References 66 publications

Crops Adaptation Management in the Conditions of Steppe Landscape of Ukraine

Crops Adaptation Management in the Conditions of Steppe Landscape of Ukraine

Nitrogen symbiotically fixed by cowpea and gliricidia in traditional and agroforestry systems under semiarid conditions

A reassessment of the contribution of soybean biological nitrogen fixation to reactive N in the environment

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