Nitrogen Transformations Near Urea in Soil With Different Water Potentials

Singh, Yadvinder; Beauchamp, E. G.

doi:10.4141/cjss88-055

Cited by 19 publications

(4 citation statements)

References 15 publications

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“…Also, surface application potentially resulted in a larger loss of NH 3 through ammonia volatilization (Malhi, 1992). Our finding is consistent with Singh and Beauchamp (1988), who found that the nitrification was completely inhibited within 0–2 cm of urea placement.…”

Section: Discussionsupporting

confidence: 93%

Application methods influence biochar–fertilizer interactive effects on soil nitrogen dynamics

Neupane

et al. 2020

Soil Science Soc of Amer J

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The potential nitrogen (N) losses from soils with fertilizer addition can be reduced when biochar is co‐applied, but this effect is influenced by the methods of biochar and fertilizer application. In a 60‐d laboratory incubation experiment, we investigated how two fertilizer application methods (surface placement and soil incorporation) affected N transformation in soils under the following treatments: control (soil with no biochar and urea [C]), biochar (150 mg N g−1 soil [B]), urea (150 mg N g−1 soil [U]), and the combination of B + U (75 mg N g−1 soil each B and U). Our results showed that at Day 30, the concentrations of soil NH4+–N and NO3−–N remained significantly higher for U but were relatively similar to control for biochar‐included treatments, indicating that the presence of biochar slowed the mineralization of urea during that period. The concentration of soil NO3−–N and cumulative N2O production under B + U treatment at 60 d was around two times higher for incorporation treatment compared with the surface treatment, indicative of a longer‐term N regulatory effect of biochar with the surface application method. Additionally, we observed a higher number of amoA gene transcripts when B + U was incorporated in the soil compared with applied to the surface at the later stage of incubation, indicative of higher potential nitrification activity. These results suggest that the surface application of B + U can be used as a slow release N source that can provide long‐term N supply to the crops, while the soil incorporation method could be used for crops that need low N at the beginning of the growth but require a substantial amount of it later. Surface co‐application of B + U can also be a good strategy to reduce soil N losses by slowing down ammonification, nitrification, N2O emission, and ammonia oxidizing bacteria activity.

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Section: Discussionsupporting

confidence: 93%

Application methods influence biochar–fertilizer interactive effects on soil nitrogen dynamics

Neupane

et al. 2020

Soil Science Soc of Amer J

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“…Addition of urea-N had significant direct effects on AOB abundance in the Tibetan alpine steppes of the present study (Figure 2). This result is contrary to most findings, which indicate that direct effects of fertilizer are limited because they are restricted to a very localized area around individual fertilizer granules (Beauchamp, 1988;Singh & Beauchamp, 1988). In the soil, urea could be hydrolyzed by urease, hence increasing the NH 4 + -N content (Reed et al, 2010).…”

Section: Effects Of N Additionmentioning

confidence: 63%

Responses of ammonia‐oxidizing archaea and bacteria to nitrogen and phosphorus amendments in an alpine steppe

Dong

Che

Jia³

et al. 2019

European J Soil Science

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With the increasing demands of livestock production, grasslands are under pressure from over‐intensified grazing. Phosphorus (P) and nitrogen (N) fertilization is widely employed to meet the nutrient demands of heavy grazing. Although soil ammonia‐oxidizers play a critical role in determining N dynamics after fertilizer application, their responses to fertilization are still not well understood in steppe grassland systems. Here, the individual and combined effects of N (0, 7.5 and 15 g N m−2 year−1) and P (0, 3.27, 6.55 and 13.09 g P m−2 year−1) applications on soil ammonia‐oxidizers were explored in the Tibetan alpine steppe. Ammonia‐oxidizing archaea (AOA) and bacteria (AOB) abundance and community composition were examined using qPCR, terminal restriction fragment length polymorphism and clone libraries. Results showed that AOB diversity was significantly increased by N fertilization and decreased by P fertilization. The abundance of AOB was significantly increased by N fertilization and its interactive effects with P application. In contrast, AOA community diversity and abundance remained unaffected by either N or P application. The AOB abundance and diversity were affected by the direct effects of N fertilization, as well as its indirect effects of N application through available N and ammonium (NH4+), and further analysis showed that NH4+ and pH were the main factors. The changes to the ammonia‐oxidizing community altered the total N content of plants and the N:P ratio of Gramineae. Plant P properties were influenced by P addition, which also interacted with soil pH and available N to indirectly affect AOB. Overall, AOB exhibited stronger responses to N and P fertilization of alpine steppe grassland than AOA, and appear to play a critical role in plant nutrient absorption under fertilization management. Highlights Effects of N and P application on AOA and AOB communities were evaluated. AOB, not AOA, responded to N or P, and their interaction, and NH4+ and pH were regulators of AOB. N application affected AOB community, resulting in changes to plant nutrient absorption. P addition affected plant tissue stoichiometry, and thus affected AOB community.

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“…Phosphate fertilization of plants with low Zn status may lead to visible Zn deficiency symptoms, a phenomenon referred to as P-induced Zn deficiency (Cakmak and Marschner, 1987). It is not clear whether decreased Zn uptake or dilution following increased biomass production are the primary reason for P-induced Zn deficiency (Singh et al, 1988; Gianquinto et al, 2000; Zhu et al, 2001; Li et al, 2003). Genes en-coding high-affinity orthophosphate transporters are up-regulated under Zn deficiency (Huang et al, 2000) resulting in higher P uptake, potentially accompanied by P toxicity which can be alleviated by addition of Zn (Marschner and Cakmak, 1986; Silber et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Elevated Phosphorus Impedes Manganese Acquisition by Barley Plants

Pedas¹,

Husted²,

Skytte³

et al. 2011

Front. Plant Sci.

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The occurrence of manganese (Mn) deficiency in cereal crops has increased in recent years. This coincides with increasing phosphorus (P) status of many soils due to application of high levels of animal manure and P-fertilizers. In order to test the hypothesis that elevated P my lead to Mn deficiency we have here conducted a series of hydroponics and soil experiments examining how the P supply affects the Mn nutrition of barley. Evidence for a direct negative interaction between P and Mn during root uptake was obtained by on-line inductively coupled plasma mass spectrometry (ICP-MS). Addition of a pulse of KH2PO4 rapidly and significantly reduced root Mn uptake, while a similar concentration of KCl had no effect. Addition of a P pulse to the same nutrient solution without plants did not affect the concentration of Mn, revealing that no precipitation of Mn–P species was occurring. Barley plants growing at a high P supply in hydroponics with continuous replenishment of Mn2+ had up to 50% lower Mn concentration in the youngest leaves than P limited plants. This P-induced depression of foliar Mn accelerated the development of Mn deficiency as evidenced by a marked change in the fluorescence induction kinetics of chlorophyll a. Also plants growing in soil exhibited lower leaf Mn concentrations in response to elevated P. In contrast, leaf concentrations of Fe, Cu, and N increased with the P supply, supporting that the negative effect of P on Mn acquisition was specific rather than due to a general dilution effect. It is concluded that elevated P supply directly interferes with Mn uptake in barley roots and that this negative interaction can induce Mn deficiency in the shoot. This finding has major implications in commercial plant production where many soils have high P levels.

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Nitrogen Transformations Near Urea in Soil With Different Water Potentials

Cited by 19 publications

References 15 publications

Application methods influence biochar–fertilizer interactive effects on soil nitrogen dynamics

Application methods influence biochar–fertilizer interactive effects on soil nitrogen dynamics

Responses of ammonia‐oxidizing archaea and bacteria to nitrogen and phosphorus amendments in an alpine steppe

Elevated Phosphorus Impedes Manganese Acquisition by Barley Plants

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