Effect of urease, nitrification and algal inhibitors on ammonia loss and grain yield of flooded rice in Thailand

Freney, J. R.; Keerthisinghe, D. G.; Phongpan, S.; Chaiwanakupt, P.; Harrington, Kevin J.

doi:10.1007/bf00750469

Cited by 31 publications

(14 citation statements)

References 36 publications

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“…In a collection of papers, Freney and his colleagues find a wide range of denitrification rates. For 15 studies of flooded rice, denitrification ranged from 3 to 56% of the Nr applied, with a median value of 34% (Simpson et al 1984;Cai et al 1986;Galbally et al 1987;Simpson and Freeney 1988;De Datta et al 1989;Zhu et al 1989;Freney et al 1990;Keerthisinghe et al 1993;Freney et al 1995). An investigation of irrigated wheat found 50% of the applied Nr denitrified (Freney et al 1992).…”

Section: Agroecosystemsmentioning

confidence: 99%

Nitrogen Cycles: Past, Present, and Future

et al. 2004

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This paper contrasts the natural and anthropogenic controls on the conversion of unreactive N 2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global N budgets for 1860 and the early 1990s and to make projections for the global N budget in 2050. Regional N budgets for Asia, North America, and other major regions for the early 1990s, as well as the marine N budget, are presented to highlight the dominant fluxes of nitrogen in each region. Important findings are that human activities increasingly dominate the N budget at the global and at most regional scales, the terrestrial and open ocean N budgets are essentially disconnected, and the fixed forms of N are accumulating in most environmental reservoirs. The largest uncertainties in our understanding of the N budget at most scales are the rates of natural biological nitrogen fixation, the amount of Nr storage in most environmental reservoirs, and the production rates of N 2 by denitrification.

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Section: Agroecosystemsmentioning

confidence: 99%

Nitrogen Cycles: Past, Present, and Future

et al. 2004

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“…Application of urease inhibitors limits urease activity at the soil surface and allows urea to move into the deeper soil layer before hydrolysis. Ammonium released then remains in the cation exchange complex in the soil (Freney et al 1995). In some laboratory and greenhouse experiments, the urease inhibitors phenylphosphorodiamidate (PPD) and N-(n-butyl)thiophosphoric triamide (NBPT) performed successfully in reducing ammonia volatilization loss (Byrnes et al 1983;Cai et al 1989).…”

Section: Urease and Algal Inhibitorsmentioning

confidence: 98%

“…Algal inhibitors can retard the growth of algae, which contribute to the rise of soil pH, and thus can reduce the ammonia volatilization loss. Freney et al (1995) found that application of an algal inhibitor (copper sulfate þ terbutryn) decreased ammonia volatilization loss resulting an increase in rice yield by 0.3-0.6 t ha 21 . Rawluk, Grant, and Racz (2001) reported that ammonia volatilization loss was decreased by 28 -88% due to NBPT application with granular urea.…”

Section: Urease and Algal Inhibitorsmentioning

confidence: 98%

Nitrogen Fertilizer Losses from Rice Soils and Control of Environmental Pollution Problems

Choudhury

Kennedy

2005

Communications in Soil Science and Plant Analysis

224

107

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Nitrogen (N) requirements of rice crop are met from both the soil and fertilizers. Because of acute N deficiency in most rice soils, fertilizer N must be applied to meet the crop demand. N fertilizer applied to rice crops is partially lost through different mechanisms, including ammonia volatilization, denitrification, and leaching. These losses may cause environmental problems such as polluting the atmosphere, aquatic systems, and groundwater. These problems cannot be alleviated completely. However, they can be reduced a considerable extent by various techniques. Research has been conducted around the world to minimize N fertilizer losses. This paper reviews this information on N fertilizer losses, indicating management practices for minimizing these losses from the soil-water system.

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“…When urea is applied to soil surface during hydrolysis it increases the pH until nitrification process accelerates (Sommer et al, 2004). So, if the relative concentration of NH3 increases from 0.1 to 1%, 10% and 50% as the pH changes from 6 to 7, 8 and 9 respectively (Freney et al, 1995).…”

Section: Factors Affecting Ammonia Volatilizationmentioning

confidence: 99%

“…Plants spend 20 moles of adenosine triphosphate (ATP) for assimilation of nitrate (NO3 -), while 5 moles of ATP in terms of NH4 + uptake by plants (Salsac et al, 1987). Hence ammonium forming fertilizers are preferred source of N. Strategies to Minimize Denitrification Losses (NO3 -, N2O, NO, N2): Inefficient use of nitrogen fertilizer not only causes considerable monetary economic loss to producers due to denitrification, but also leads to sever environmental pollution due to nitrate leaching and nitrous oxide emission (Freney et al, 1995;Azam et al, 2002;Reeves et al, 2002). Fields under alternate flooding and drying, show significant amount of nitrogen loss due to nitrification followed by denitrification as a result of oxidation and reduction (Burford & Bremner, 1975).…”

Section: N2mentioning

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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Effect of urease, nitrification and algal inhibitors on ammonia loss and grain yield of flooded rice in Thailand

Cited by 31 publications

References 36 publications

Nitrogen Cycles: Past, Present, and Future

Nitrogen Cycles: Past, Present, and Future

Nitrogen Fertilizer Losses from Rice Soils and Control of Environmental Pollution Problems

Nitrogen Management in Calcareous Soils: Problems and Solutions

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