Seasonal pattern of denitrification under an irrigated wheat-maize cropping system fertilized with urea and farmyard manure in different combinations

Mahmood, Tariq; Ali, Rehmat; Malik, K. A.; Aslam, Z.; Ali, Sehrish

doi:10.1007/s00374-005-0869-0

Cited by 32 publications

(15 citation statements)

References 23 publications

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“…However a simulation was performed using the MOBILE-DNDC model (de Bruijn et al 2009) which estimated annual emissions by denitrification ranging between −3.3 and −7.3 kg N ha -1 y -1 on the given period. This estimate is coherent with existing data on agricultural crops (Barton et al 1999;Mahmood et al 2005;Mahmood et al 1998;Sanchez et al 2001). These relatively small emissions can also be explained by the relatively dry soil, especially during the spring when nitrogen was applied to the field (Fig.…”

Section: Other Nitrogen Fluxessupporting

confidence: 78%

Carbon, nitrogen and Greenhouse gases budgets over a four years crop rotation in northern France

et al. 2011

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Croplands mainly act as net sources of the greenhouse gases carbon dioxide (CO₂) and nitrous oxide (N₂O), as well as nitrogen oxide (NO), a precursor of troposheric ozone. We determined the carbon (C) and nitrogen (N) balance of a four-year crop rotation, including maize, wheat, barley and mustard, to provide a base for exploring mitigation options of net emissions. The crop rotation had a positive net ecosystem production (NEP) of 4.4 +/- 0.7 Mg C ha(-1) y(-1) but represented a net source of carbon with a net biome production (NBP) of -1.3 +/- 1.1 Mg C ha(-1) y(-1). The nitrogen balance of the rotation was correlated with the carbon balance and resulted in net loss (-24 +/- 28 kg N ha(-1) y(-1)). The main nitrogen losses were nitrate leaching (-11.7 +/- 1.0 kg N ha(-1) y(-1)) and ammonia volatilization (-9 kg N ha(-1) y(-1)). Dry and wet depositions were 6.7 +/- 3.0 and 5.9 +/- 0.1 kg N ha(-1) y(-1), respectively. Fluxes of nitrous (N₂O) and nitric (NO) oxides did not contribute significantly to the N budget (N₂O: -1.8 +/- 0.04; NO: -0.7 +/- 0.04 kg N ha(-1) y(-1)) but N₂O fluxes equaled 16% of the total greenhouse gas balance. The link between the carbon and nitrogen balances are discussed. Longer term experiments would be necessary to capture the trends in the carbon and nitrogen budgets within the variability of agricultural ecosystems

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Section: Other Nitrogen Fluxessupporting

confidence: 78%

Carbon, nitrogen and Greenhouse gases budgets over a four years crop rotation in northern France

et al. 2011

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“…This phenomenon is highly pronounced under heavy irrigation or excessive rainfall and especially on light textured soils. In some studies leaching losses were measured in clay type of soils (Mahmood et al, 2005). There is a greater potential for NO3 -leaching as it moves through the soil with diffusion and mass flow of water (Hermann et al, 2005).…”

Section: Nitrogen Losses Associated With Nitrification and Environmenmentioning

confidence: 99%

“…Denitrification is usually based on the aerobic heterotrophic bacteria that have ability to reduce NO3 -in limited supply of oxygen (Mahmood et al, 2000;Mahmood et al, 2005) such as Pseudomonas aeruginosa, Bacillus nitrosus, Escherichia coli, and aspergillus flavus can reduce NO3 -to gaseous forms such as N2O, NO and elemental nitrogen (N2) into the atmosphere, under poor soil aeration (Di et al, 2002;Subbarao et al, 2006). Denitrification occurs when microbes convert ammonium to nitrate and use the nitrate as a terminal electron acceptor under saturated soil conditions.…”

Section: Denitrificationmentioning

confidence: 99%

Nitrogen Management in Calcareous Soils: Problems and Solutions

Maqsood¹,

Awan²,

Aziz³

et al. 2016

PAKJAS

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Nitrogen (N) is the most widely applied plant nutrient and is a key constituent of animal manures. Improvement in crop yields and high economic returns have been made possible through supplementation of crops with organic and inorganic fertilizers. The movement of N in the environment has been extensively studied and documented. The fate of N ranges from nitrification, denitrification, nitrous oxide formation, leaching of nitrate, and volatilization of ammonia. Even with this knowledge the variation in N movement within the soil, air and water varies greatly with changed edaphic factors. For instance the fate of N fertilizer under calcareous soil systems still has not been investigated widely. We reviewed the sporadic information available on N fate and management in calcareous soils especially in Pakistan. We discussed the sources and fate of N in calcareous soils of Pakistan and also the currently adopted and newly developed method to reduce the N losses.

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“…The highestrates are often measured in spring and fall, which indicates that soil water status, is a strong controlling factor. Hence, floodirrigated cropping systems are especially prone to denitrification and recovery of fertilized nitrogen is often poor (Aulakh et al, 2001;Mahmood et al, 2000Mahmood et al, , 2005. To minimize the nitrogen losses, the feasible option is to focus on agricultural practices.…”

Section: Consequences Of Denitrification For Agriculturementioning

confidence: 99%

“…Fertilization can also affect the N 2 O to N 2 ratio from denitrification, and N 2 O emissions are most likely increasing due to an increased input of fertilization (Skiba and Smith, 2000). It has often been suggested that denitrification is limited under field conditions by NO3-availability (Bronson et al, 1992;Mahmood et al, 2005), which in turn is influenced by the fertilizer type and application rate together with timing and application method. For example, losses by denitrification are often highest shortly after fertilization application and these losses can account for 50-75% of the annual loss in afield (Ellis et al, 1998;Mogge et al, 1999).…”

Section: Presence Of Fertilizersmentioning

confidence: 99%