Symbiotic N2 fixation by soybean in organic and conventional cropping systems estimated by 15N dilution and 15N natural abundance

Oberson, Astrid; Nanzer, Simone; Bosshard, Ch.; Dubois, David; Mäder, Paul; Frossard, Emmanuel

doi:10.1007/s11104-006-9122-3

Cited by 61 publications

(66 citation statements)

References 35 publications

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“…Although in the present study 42% to 65% of soybean N was obtained from BNF, this could not turn then balance into a positive one. Similar soybean N balances have been reported for Argentina [34] and Switzerland [35]. In fact, in their review of BNF studies that had been conducted between 1966 and 2006, [8] observed that the amount of fixed N in soybean (a grain legume as opposed to non-grain legumes or legumes where the grain is usually not harvested) was, in most cases, insufficient to replace all the N removed in harvested seed.…”

Section: Nitrogen Fixed and N Balancessupporting

confidence: 58%

Effects of Tillage and Crop Residue Application on Soybean Nitrogen Fixation in a Tropical Ferralsol

Kihara

Martius²,

Bationo³

et al. 2011

Agriculture

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This study was aimed at quantifying soybean (Glycine max) nitrogen fixation under reduced tillage (RT) and conventional tillage (CT) in a tropical Ferralsol of the sub-humid zone of western Kenya, using the isotope 15 N dilution method. Crop residue (CR) management was a superimposed treatment in soybean-maize rotation and intercropping systems. This study quantified N in abscised soybean leaves. Soybean-N derived from the atmosphere (%NDfA) ranged between 41-65%; it was higher (P < 0.05) in RT (55.6%) than in CT (46.6%). Total fixed-N under 'RT + CR' was more than in the other treatments by at least 55% in intercropping and 34% in rotation system. Nitrogen fixed in soybean aboveground parts was 26-48 kg N ha , with 54% NDfA. Annual nitrogen balances with soybean and maize grain removed were better in RT (−9 to −32 kg N ha −1 ) than in CT (−40 to −60 kg N ha −1 ). Application of P increased nodule weight (P < 0.05) by 3 to 16 times over the control. Soybean residues should be returned to the field after harvest to reduce soil N mining. We conclude that 'RT + CR' increases biological nitrogen fixation in soybean, over CT, and that phosphorus application is needed for better soybean nodulation in western Kenya. OPEN ACCESSAgriculture 2011, 1 23

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Section: Nitrogen Fixed and N Balancessupporting

confidence: 58%

Effects of Tillage and Crop Residue Application on Soybean Nitrogen Fixation in a Tropical Ferralsol

Kihara

Martius²,

Bationo³

et al. 2011

Agriculture

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“…To calculate the B value, we used was the most negative value detected, which in soybean was -1.43‰, and in red clover was -1.84‰. This is similar to earlier reported values for soybean (-1.2‰) (Oberson et al, 2007).…”

Section: Plant Measurementssupporting

confidence: 86%

“…An on-farm study that evaluated a gradient of management practices that varied in reliance on organic N amendments found evidence for downregulation of BNF in fields with enhanced soil inorganic N and other altered edaphic properties (Schipanski and Drinkwater 2012). However, a field experiment using 15 N natural abundance and dilution techniques demonstrated the opposite effect: elevated soybean BNF rates under organic and compost-based management were found with enhanced soil organic N pools, relative to N-fertilizer management (Oberson et al, 2007). Neither of these studies were performed over multiple years, and seasonal effects in rain-fed production systems are expected to be important as soil moisture has been shown to strongly regulate BNF in many legumes (Purcell et al, 2004).…”

Section: Compost Legacy Down-regulates Biological Nitrogen Fixation Imentioning

confidence: 99%

“…The 15 N natural abundance method was used to provide an integrated measure of biological N fixation in soybean and red clover (Oberson et al, 2007). Non-nod soybean isolines (cultivar Williams) provided a non-fixing N reference value and were established in microplots (2 by 2. where "ref" are non-fixing and "fix" are nitrogen-fixing plants grown under the same conditions, and "b" is the fixing plant grown with atmospheric N 2 as the sole external nitrogen source (Oberson et al, 2007).…”

Section: Plant Measurementsmentioning

confidence: 99%

“…Non-nod soybean isolines (cultivar Williams) provided a non-fixing N reference value and were established in microplots (2 by 2. where "ref" are non-fixing and "fix" are nitrogen-fixing plants grown under the same conditions, and "b" is the fixing plant grown with atmospheric N 2 as the sole external nitrogen source (Oberson et al, 2007). To calculate the B value, we used was the most negative value detected, which in soybean was -1.43‰, and in red clover was -1.84‰.…”

Section: Plant Measurementsmentioning

confidence: 99%

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Compost Legacy Down‐Regulates Biological Nitrogen Fixation in a Long‐Term Field Experiment

et al. 2017

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Core Ideas Compost‐based management enhanced soil organic matter in a Michigan Alfisol. Nitrogen fixation rates in soybean and red clover varied with management history. Weather markedly influenced the quantity of N fixed in three crop systems. Soil labile pool influence on N fixation can act as an internal regulator. Biological nitrogen fixation (BNF) is a fundamental process relied on in agriculture, yet few field studies have examined regulation through soil inorganic N feedbacks or considered seasonal effects. In a Michigan long‐term field experiment we examined soil labile C and N pools and impact on BNF in two species, over multiple years. The 15N natural abundance method was used to quantify BNF, with nodulated and non‐nodulated soybean [Glycine max (L.) Merr.] isolines and red clover (Trifolium pratense L.). Soil organic C status of plots was consistent with a gradient established through historical inputs: 0.8% (fertilizer management) to 0.9% (+ cover crop) to 1.2% (+ compost + cover crop). The fraction of nitrogen derived from atmosphere (fNdfa) in red clover and soybean over 3 yr was 61 to 58% with compost management, and 71 to 72% with fertilizer. This represented a downregulation of 19% (red clover) and 15% (soybean) in compost and cover crop managed plots, relative to inorganic fertilizer. In addition to management effects, we found that weather markedly influenced the total amount of N fixation over the 3 yr of the study. A mesic season supported vigorous soybean growth and 195 kg N ha−1 BNF, compared to 95 and 90 kg N ha−1 BNF in a dry and an excessively wet season. This study found that compost‐based management increased pools of labile C and N that internally downregulated BNF, while enhancing soybean yield compared to conventional management.

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Current and future agronomic perspectives on rainfed soybean production systems in South Africa

Haarhoff¹,

Swanepoel

2021

Agronomy Journal

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Alternative crop and soil management practices can offer additional tools to address current soybean [Glycine max (L.) Merr.] yield gaps in South Africa. Despite recent genetic advancements and the introduction of novel weed management strategies, soybean yield remained static. Inconsistent rainfall patterns, high temperatures, and soil compaction have been limiting soybean productivity. Uncertainty exists among farmers regarding optimal nitrogen fertilizer management due to inconsistent yield responses and likely due to a shortage of locally generated scientific information. The benefits provided by including soybean in a maize (Zea mays L.) monoculture production system has been identified, however, crop rotation effects on yield in combination with newly introduced agronomic practices such as no-tillage and crop residue retention are inconsistent. Modern germplasm offers several opportunities to improve water use efficiency by limiting water-stress conditions during the reproductive growth stages when yield components are highly sensitive. The introduction of less rigorous soil tillage practices alongside greater residue retention can lessen surface runoff and evaporation losses. Scientifically evaluated research is crucially needed to advance the understanding of current soybean yield gaps and to facilitate the development of tailored management practices to address farm-specific challenges while beneficial soil and crop conditions are taken advantage of.

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Symbiotic N2 fixation by soybean in organic and conventional cropping systems estimated by 15N dilution and 15N natural abundance

Cited by 61 publications

References 35 publications

Effects of Tillage and Crop Residue Application on Soybean Nitrogen Fixation in a Tropical Ferralsol

Effects of Tillage and Crop Residue Application on Soybean Nitrogen Fixation in a Tropical Ferralsol

Compost Legacy Down‐Regulates Biological Nitrogen Fixation in a Long‐Term Field Experiment

Current and future agronomic perspectives on rainfed soybean production systems in South Africa

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