Reducing ammonia volatilization from paddy field with rice straw derived biochar

Sun, Xue; Zhong, Ting; Zhang, Lu; Zhang, Kangshu; Wu, Weixiang

doi:10.1016/j.scitotenv.2018.12.450

Cited by 102 publications

(18 citation statements)

References 44 publications

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“…Similar results for active Co chemisorption by hydroxyl functional groups were described by Liu et al [61]. Sun et al [27] showed that oxygen-containing surface functional groups, for example, C-O, C-O-C, and C=O increased biochar capability for element immobilization [62], suggesting that these groups play important roles in metal sorption. The quantities and quality of functional groups on biochar surface vary, depending on biochar production conditions and feedstock types used.…”

Section: Discussionsupporting

confidence: 73%

“…A comparison with other forms of carbonaceous sorbents shows that biochar is a promising adsorbent with lower cost for metal removal from water. Much research has recently been conducted to explore biochar efficiency for heavy metal, including Co removal from an aqueous solution [24][25][26][27]. Most of this research has provided sorption mechanisms for metals as a group, however, a comparison of mechanisms for removal of different metals is necessary to describe biochar capacity for heavy metal sorption.…”

Section: Introductionmentioning

confidence: 99%

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Wheat Straw Biochar as a Specific Sorbent of Cobalt in Soil

et al. 2020

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There is an urgent need to search for new sorbents of pollutants presently delivered to the environment. Recently biochar has received much attention as a low-cost, highly effective heavy metal adsorbent. Biochar has been identified as an efficient material for cobalt (Co) immobilization from waters; however, little is known about the role of Co immobilization in soil. Hence, in this study, a batch experiment and a long-term incubation experiment with biochar application to multi-contaminated soil with distinct properties (sand, loam) were conducted to provide a brief explanation of the potential mechanisms of Co (II) sorption on wheat straw biochar and to describe additional processes that modify material efficiency for metal sorption in soil. The soil treatments with 5% (v/w) wheat straw biochar proved to be efficient in reducing Co mobility and bioavailability. The mechanism of these processes could be related to direct and indirect effects of biochar incorporation into soil. The FT-IR analysis confirmed that hydroxyl and carboxyl groups present on the biochar surface played a dominant role in Co (II) surface complexation. The combined effect of pH, metal complexation capacity, and the presence of Fe and Mn oxides added to wheat straw biochar resulted in an effective reduction of soluble Co (II), showing high efficiency of this material for cobalt sorption in contaminated soils.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Wheat Straw Biochar as a Specific Sorbent of Cobalt in Soil

et al. 2020

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“…Second, HC could release organic acid and phenol, which showed a negative effect on rice growth and its N uptake 30 . Moreover, HC application might have an impact on soil microbial community 32,43 . Soil microbial community should be considered for further biochar application study focus on PAV.…”

Section: Why Low Ph Hydrochar Didn't Reduce Pav?mentioning

confidence: 99%

Hydrochar did not reduce rice paddy NH3 volatilization compared to pyrochar in a soil column experiment

Liu

Cheng

Liu

et al. 2020

Sci Rep

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Pyrochar (PC) is always with high pH value, and improper application might increase rice paddy ammonia volatilization (PAV), which is the main nitrogen loss through air during rice production. Differently, hydrochar (HC) takes the advantages of high productive rate and always with lower pH value compared with PC. However, effect pattern and mechanism of HC on PAV are still unclear. In the present study, soil column experiments were conducted to investigate the effect of PC and HC application on PAV. In total, treatments with four types of biochar (WPC, SPC, WHC and SHC, i.e., PC and HC prepared with wheat straw and sawdust, respectively) and two application rates (0.5% and 1.5%, w/w) were set up and non-biochar application was used as control. Results showed that, application of HC with low pH value could not reduce PAV compared with PC. Total PAV increased significantly as the increase of HC application rate (especially for WHC). The increment of PAV under high rate HC application might be due to the strong buffer capacity of soil, the aging of biochar, the high nitrogen from HC. The results indicated that HC should be pretreatment before utilization in agricultural environment considering PAV reduction.

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“…The ventilation method was used to measure ammonia volatilization (AV) (Xu et al, 2012;Sun et al, 2019a). After soaking with phosphoglycerol, two sponges (diameter = 15 cm and thickness = two cm) were laid in a PVC pipe (diameter = 15 cm and height = 20 cm) to collect the NH 3 .…”

Section: Ammonia Volatilizationmentioning

confidence: 99%

Nitrogen fertilizer reduction in combination withAzollacover for reducing ammonia volatilization and improving nitrogen use efficiency of rice

Yang

Liu

et al. 2021

PeerJ

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Background Excessive nitrogen (N) application rate with low N use efficiency (NUE) caused a considerable amount of N losses, especially ammonia volatilization (AV). Proper N fertilizer reduction (RN) could significantly reduce AV. However, continuous RN led to a nutrient deficiency in the soil and therefore negatively impacted the NUE and rice yield. Paddy Azolla, a good green manure, is considered as a promising measure to decrease AV and improve NUE and grain yield of rice. However, there is limited information on the integrated effects of RN and Azolla cover on the AV, NUE, and rice yield, especially in the highly fertilized rice-growing systems. Methods The experiment was conducted including eight treatments: the control (without N fertilizer and Azolla cover), Azolla cover without N fertilizer (A), farmer’s N application rate (FN), FN + Azolla cover (FNA), 15% RN from FN (RN15), RN15 + Azolla cover (RN15A). 30% RN from FN (RN30), RN30 + Azolla cover (RN30A). The integrated effects of N fertilizer reduction and Azolla cover on AV, NUE, and rice grain was evaluated. Results RN15A and RN30A substantially reduced total AV by 50.3 and 66.9% compared with FN, respectively, primarily due to the lower surface water ammonia concentrations and pH. RN improved the efficiency of Azolla cover on reducing AV, with 4.1–9.9% higher than for FN. Compared with the FN, RN15A and RN30A enhanced apparent N recovery efficiency (ANRE) by 46.5 and 39.1%, which might be responsible for the lower NH3 emission and the increased total N uptake / total chemical N applied. Furthermore, RN15A and RN30A reduced yield-scaled volatilization by 52.3 and 64.3% than for FN, respectively. Thus, combining 15–30% RN with Azolla cover may be a way to reduce AV and improve ANRE without decreasing rice grain yield.

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Reducing ammonia volatilization from paddy field with rice straw derived biochar

Cited by 102 publications

References 44 publications

Wheat Straw Biochar as a Specific Sorbent of Cobalt in Soil

Wheat Straw Biochar as a Specific Sorbent of Cobalt in Soil

Hydrochar did not reduce rice paddy NH3 volatilization compared to pyrochar in a soil column experiment

Nitrogen fertilizer reduction in combination withAzollacover for reducing ammonia volatilization and improving nitrogen use efficiency of rice

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