Biological N2-fixation in grass-clover ley in response to N application in cattle slurry vs. mineral fertilizer

Ammonia (NH3), methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) emissions from livestock farms contribute to negative environmental impacts such as acidification and climate change. A significant part of these emissions is produced from the decomposition of slurry in livestock facilities, during storage and treatment phases. This research aimed at evaluating the effectiveness of the additive “SOP LAGOON” (made of agricultural gypsum processed with proprietary technology) on (i) NH3 and Greenhouse Gas (GHG) emissions, (ii) slurry properties and N loss. Moreover, the Life Cycle Assessment (LCA) method was applied to assess the potential environmental impact associated with stored slurry treated with the additive. Six barrels were filled with 65 L of cattle slurry, of which three were used as a control while the additive was used in the other three. The results indicated that the use of the additive led to a reduction of total nitrogen, nitrates, and GHG emissions. LCA confirmed the higher environmental sustainability of the scenario with the additive for some environmental impact categories among which climate change. In conclusion, the additive has beneficial effects on both emissions and the environment, and the nitrogen present in the treated slurry could partially displace a mineral fertilizer, which can be considered an environmental credit.

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Nitrogen Pools in Tropical Plantations of N2-Fixing and Non-N2-Fixing Legume Trees under Different Tree Stand Densities

Nitrogen ◽

10.3390/nitrogen2010006 ◽

2021 ◽

Vol 2 (1) ◽

pp. 86-98

Author(s):

Kelly Nery Bighi ◽

Ranieri Ribeiro Paula ◽

Marcos Vinícius Winckler Caldeira ◽

Diego Lang Burak ◽

Eduardo de Sá Mendonça ◽

...

Keyword(s):

N2 Fixation ◽

Stand Density ◽

N Accumulation ◽

Biological N2 Fixation ◽

Nitrogen Acquisition ◽

Nitrogen Pools ◽

Acquisition Strategies ◽

Tropical Plantations ◽

Schizolobium Parahyba ◽

Slow Growing

We investigated the nitrogen pools in monocultures of legume species widely used in reforestation in Brazil that have contrasting growth and nitrogen acquisition strategies. The plantations were established with the slow-growing and N2-fixing tree Anadenanthera peregrina var. peregrina, and the fast-growing and non-fixing tree Schizolobium parahyba var. amazonicum. The measurements of N pools in the tree biomass and the soil followed standard methods and were carried out on 54 experimental plots. The N2 fixation pools were evaluated by abundance natural of 15N and the N accretion methods. The soil N content was of similar magnitude between species and stand densities. The species showed similar amounts of N in the biomass, but divergent patterns of N accumulation, as well as the 15N signature on the leaves. S. parahyba accumulated most N in the stem, while A. peregrina accumulated N in the roots and leaves. However, the N accumulation in biomass of A. peregrina stand was less constrained by environment than in S. parahyba stands. The percentage of N derived from N2 fixation in A. peregrina stands decreased with the increase of stand density. The biological N2 fixation estimates depended on the method and the response of tree species to environment.

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Biological N2-fixation on Mangrove Pneumatophores: Preliminary Observations and Perspectives

AMBIO ◽

10.1579/0044-7447-31.7.612 ◽

2002 ◽

Vol 31 (7) ◽

pp. 612-613 ◽

Cited By ~ 23

Author(s):

Charles Lugomela ◽

Birgitta Bergman

Keyword(s):

N2 Fixation ◽

Biological N2 Fixation

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Growth and yield of common bean cultivars at two soil phosphorus levels under biological nitrogen fixation

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2000000400019 ◽

2000 ◽

Vol 35 (4) ◽

pp. 809-817 ◽

Cited By ~ 14

Author(s):

ADELSON PAULO ARAÚJO ◽

MARCELO GRANDI TEIXEIRA ◽

DEJAIR LOPES DE ALMEIDA

Keyword(s):

Common Bean ◽

N2 Fixation ◽

Soil Phosphorus ◽

Block Design ◽

Growth And Yield ◽

Yield Potential ◽

Genotypic Differences ◽

Biological N2 Fixation ◽

Randomized Block Design ◽

P Supply

The genotypic differences on growth and yield of common bean (Phaseolus vulgaris L.) in response to P supply were evaluated in a field experiment under biological N2 fixation. Eight cultivars were grown at two levels of applied P (12 and 50 kg ha-1 of P -- P1 and P2 respectively), in randomized block design in factorial arrangement. Vegetative biomass was sampled at three ontogenetic stages. The effects of genotype and phosphorus were significant for most traits, but not the genotype ´ phosphorus interaction. The cultivars presented different patterns of biomass production and nutrient accumulation, particularly on root system. At P1, P accumulation persisted after the beginning of pod filling, and P translocation from roots to shoots was lower. The nodule senescence observed after flowering might have reduced N2 fixation during pod filling. The responses of vegetative growth to the higher P supply did not reflect with the same magnitude on yield, which increased only 6% at P2; hence the harvest index was lower at P2. The cultivars with highest yields also presented lower grain P concentrations. A sub-optimal supply of N could have limited the expression of the yield potential of cultivars, reducing the genotypic variability of responses to P levels.

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