Biological N2 Fixation in wetland rice fields: Estimation and contribution to nitrogen balance

Roger, Pierre-Armand; Ladha, J. K.

doi:10.1007/bf00011309

Cited by 173 publications

(68 citation statements)

References 35 publications

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“…Soil N and BNF by associated organisms are major sources of N for low land rice. The 50-60% N requirement is met through the combination of mineralization of soil organic N and BNF by free living and rice plant associated bacteria (Roger and Ladha, 1992). To achieve food security through sustainable agriculture, the requirement for fixed nitrogen must be increasingly met by BNF rather than by industrial nitrogen fixation.…”

Section: Blue Green Algae (Bga)mentioning

confidence: 99%

Organic Farming for Crop Improvement and Sustainable Agriculture in the Era of Climate Change

Roychowdhury¹,

Banerjee²,

Sofkova³

et al. 2013

OnLine Journal of Biological Sciences

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Sustainable development has caught the imagination and action of the world for more than a decade. Sustainable agriculture is necessary to attain the goal of sustainable development. According to the Food and Agriculture Organization (FAO), sustainable agriculture is the successful management of resources to satisfy the changing human needs while maintaining or enhancing the quality of environment and conserving natural resources. All definitions of sustainable agriculture lay great emphasis on maintaining an agricultural growth rate, which can meet the demand for food of all living beings without draining the basic resources towards crop improvement. Organic farming is one of the several approaches found to meet the objectives of sustainable agriculture. Most of the techniques used in organic farming like intercropping, mulching and integration of crops and livestock are not alien to agriculture systems including the traditional agricultural practices. However, organic farming is based on various laws and certification programmes, which prohibit the use of almost all synthetic inputs and the central theme of this method is the health of soil. The adverse effects of modern agricultural practices on the farm and also on the health of living beings and thus on the environment has been well documented all over the world. Application of technology, particularly the use of chemical fertilizers and pesticides all around us has persuaded people to think aloud. As a result of global climatic changes, their negative effects on the environment are manifested through soil erosion, water shortages, salination, soil contamination, genetic erosion, Organic farming is one of the widely used methods, which is thought as the best alternative to avoid the ill effects of chemical farming. It also has far more advantages over the conventional and other modern agricultural practices that are available today.

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Section: Blue Green Algae (Bga)mentioning

confidence: 99%

Organic Farming for Crop Improvement and Sustainable Agriculture in the Era of Climate Change

Roychowdhury¹,

Banerjee²,

Sofkova³

et al. 2013

OnLine Journal of Biological Sciences

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“…Research on biological nitrogen (N) fixation and its role in maintaining soil N fertility in wetland ecosystems has focused on coastal wetlands such as salt marshes, mangroves (Pelegri and Twilley 1998;Bagwell and Lovell 2000;Nielsen et al 2001;Tyler et al 2003; Lee and Joye 2006;Moseman 2007), and on rice fields (Eskew et al 1981;Roger and Ladha 1992;Roger 1995). Data from freshwater wetlands, however, are rather limited (Bristow 1973;Tjepkema and Evans 1976;Scott et al 2008;Č erná et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Nutrient enrichment in tropical wetlands: shifts from autotrophic to heterotrophic nitrogen fixation

et al. 2010

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We used established long-term experimental P-amended plots in freshwater marshes of northern Belize to determine the impact of P input on nitrogen (N) fixation. Marshes with different conductivities and sulfate concentrations were selected to elucidate the effect of salinity and the contribution of sulfur reducing bacteria to the overall N fixation. Rates of N fixation in sediment, roots, and cyanobacterial mats was measured in laboratory incubation experiments (acetylene reduction assay calibrated by 15 N 2 reduction assay) with and without the addition of sodium molybdate (sulfur reducing bacteria inhibitor). P has increased macrophyte primary production significantly, which led to the rapid elimination of cyanobacterial mats and the elimination of autotrophic N fixation. P addition enhanced heterotrophic N fixation in both the sediments and rhizosphere due primarily to increased C supply to the sediment. When expressed on a dry weight basis, root associated N fixation was higher than sediment N fixation, but the contribution of the root associated fixation to the total N fixation was small when expressed per square meter. Sulfur reducing bacteria were an important component of N fixation, contributing from 20 to 53% to the overall N fixation. A simple N budget was created to determine if N demands are met following P addition. The heterotrophic N fixation substituted in part for autotrophic cyanobacterial N fixation when P limitation was alleviated.

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“…Research on biological N fixation and its role in maintaining soil N fertility in wetland ecosystems has focused on rice fields (Roger & Ladha, 1992;Roger, 1995) and coastal wetlands such as salt marshes and mangroves (Pelegri & Twilley, 1998;Bagwell & Lovell, 2000;Nielsen et al, 2001;Tyler et al, 2003;Moseman, 2007). However, such research is rather limited in freshwater marshes (Bristow, 1973;Tjepkema & Evans, 1976;Inglett et al, 2004;Scott et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic nitrogen fixation in oligotrophic tropical marshes: changes after phosphorus addition

et al. 2009

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In order to determine the impact of nutrient enrichment on phosphorus (P) limited wetlands, we established experimental P additions in marshes throughout northern Belize. P significantly increased macrophyte primary production, which led to the rapid elimination of cyanobacterial mats. The replacement of cyanobacterial mats by macrophytes constrained autotrophic nitrogen (N) fixation, increased the quantity, and changed the quality of organic matter input to the sediments. We predicted that the activity of sediment heterotrophic N fixers will be impacted by these alterations in carbon input. We used the acetylene reduction technique to measure potential (glucose amended) nitrogenase activity (NA) in sediments from controls and treatment plots that have been P enriched for four years and dominated either by Eleocharis cellulosa, or Typha domingensis for two years. NA in P-enriched plots was 2-3 orders of magnitude higher than NA in controls. NA was positively correlated with the soil reactive P, both total organic and microbial carbon, live root biomass, and total phospholipid fatty acids (PLFA) as an indicator of active microbial biomass. It was negatively correlated with the concentration of ammonium-N. Path analysis revealed that the indirect effect of P on NA through the root biomass was more important than the direct effect of P. NA of the upper sediment layer was consistently higher in Eleocharis than in Typha dominated plots, despite the higher litter input by Typha. We feel that the higher levels of lignin and phenolics occurring in Typha litter, relative to Eleocharis, constrained NA in Typha plots.

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Biological N2 Fixation in wetland rice fields: Estimation and contribution to nitrogen balance

Abstract: Introduction

Cited by 173 publications

References 35 publications

Organic Farming for Crop Improvement and Sustainable Agriculture in the Era of Climate Change

Organic Farming for Crop Improvement and Sustainable Agriculture in the Era of Climate Change

Nutrient enrichment in tropical wetlands: shifts from autotrophic to heterotrophic nitrogen fixation

Heterotrophic nitrogen fixation in oligotrophic tropical marshes: changes after phosphorus addition

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