Nitrogen Use and Management in Orchards and Vegetable Fields in China: Challenges and Solutions

doi:10.15302/j-fase-2022443

Cited by 2 publications

(3 citation statements)

References 37 publications

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“…For instance, land used for growing vegetables, which often undergo multiple annual harvests, generally experiences higher irrigation and fertilizer application rates compared with cereal land. Consequently, these areas tend to accumulate more nitrogen in the vadose zone, thereby resulting in higher groundwater nitrate concentrations. ,,, Furthermore, it is important to consider potential point sources of nitrate pollution. Previous study has shown that point source pollution contributes significantly to the elevated nitrate concentration in the hill region of the NCP …”

Section: Results and Discussionmentioning

confidence: 99%

“…Consequently, these areas tend to accumulate more nitrogen in the vadose zone, thereby resulting in higher groundwater nitrate concentrations. 23,26,69,70 Furthermore, it is important to consider potential point sources of nitrate pollution. Previous study has shown that point source pollution contributes significantly to the elevated nitrate concentration in the hill region of the NCP.…”

Section: Key Features Impacting Lag Time-considered Nitrate Groundwat...mentioning

confidence: 99%

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Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Wu,

Guo,

Zhan

et al. 2024

ACS EST Water

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The North China Plain (NCP) has been facing declining groundwater levels and increasing nitrate contamination over the past few decades. Understanding the transport and accumulation of nitrogen in the subsurface is crucial to sustainable groundwater management. This work aims to evaluate the impact of historical nitrogen loading and fluctuating water tables on groundwater quality, estimate the distribution of the nitrate concentration in the aquifer, and assess the potential pollution risk associated with rising groundwater levels. The simulation involves determining the nitrate input to the aquifer and calculating the groundwater nitrate concentration using a mixing model. It is found that historical nitrogen loading has not significantly impacted shallow aquifer water quality yet, and deep groundwater nitrate concentrations remain stable. However, if groundwater levels are restored due to management strategies in the next 15 years, noticeable deterioration of shallow water quality would occur. The areas that are most vulnerable to nitrate contamination are expected to be the piedmont plain and southern and eastern parts of the central plain, with the pollution extending toward the central and northern regions. Moreover, it is estimated that the exceedance rate of nitrate concentration in the NCP could potentially double due to rising water levels by 2035.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Key Features Impacting Lag Time-considered Nitrate Groundwat...mentioning

confidence: 99%

Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Wu,

Guo,

Zhan

et al. 2024

ACS EST Water

View full text Add to dashboard Cite

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“…To some extent, it reflects the nitrogen use efficiency [58]. Therefore, clarifying the N surplus in an agricultural system is critical for controlling N losses [59]. It has been shown that a positive correlation does exist between nitrogen surplus and soil alkaline nitrogen content [60], indicating that the higher the alkaline nitrogen content, the higher the soil nitrogen surplus, along with a correspondingly increased potential risk of surface source pollution.…”

Section: Nitrogen Fertilizer Rate and N Surplusmentioning

confidence: 99%

Nitrogen Application Effect on Maize Yield, NH3, and N2O Emissions in Northeast China by Meta-Analysis

Zhang

Qiang

et al. 2023

Agronomy

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Ammonia volatilization (NH3) and nitrous oxide (N2O) emission are the main underliers of nitrogen loss in farmlands, which can decrease nitrogen use efficiency and trigger environmental problems regarding greenhouse effects. Previous studies have regional limitations and lack universal guiding significance, as they are primarily based on individual experiments related to the effects of applying nitrogen fertilizer on maize. In this study, we performed a meta-analysis on a regional scale to investigate the overall impact of nitrogen fertilizer application on maize yield, N2O, and NH3 in Northeast China. The database included 85 studies and 1147 pairs of experimental data that were analyzed. The results showed that applying nitrogen fertilizer significantly increased maize yield, N2O emissions, and NH3 volatilization effects, and the growth rates (E) were 50.64%, 64.39%, and 69.25%, respectively. In Northeast China, the average emission factors of N2O and NH3 were 0.72% and 8.21%, respectively. The optimum nitrogen application rate for maize in Northeast China was 205 kg ha−1, resulting in 8.37% nitrogen loss (through N2O and NH3). Soil texture, alkaline nitrogen (AN) content in the soil, mean annual precipitation (MAP), nitrogen application rate, and fertilizer type were the key influential factors affecting changes in maize yield and N loss (N2O and NH3). Yield-scaled N2O and NH3 were found to be the significant emission reduction parameters that ensured maize yield. However, there was a remarkable ‘seesaw effect’ between yield-scaled N2O and NH3 under the same natural conditions (MAP and soil texture). Therefore, human activities such as reducing N surplus in soil, and N fertilizer application rate, along with selecting suitable fertilizer types should be given more attention to reduce yield-scaled N2O and NH3. Moreover, minimizing NH3 and N2O dual emission should be the main objective for green agriculture in Northeast China, rather than over-emphasizing on single emission reduction.

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Nitrogen Use and Management in Orchards and Vegetable Fields in China: Challenges and Solutions

Cited by 2 publications

References 37 publications

Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Nitrogen Application Effect on Maize Yield, NH3, and N2O Emissions in Northeast China by Meta-Analysis

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