Effects of Biochar Addition on Nitrogen Leaching Loss in the Vegetable Soil

The use of water-saving irrigation techniques has been encouraged in rice fields in response to irrigation water scarcity. Straw return is an important means of straw reuse. However, the environmental impact of this technology, e.g., nitrogen leaching loss, must be further explored. A two-year (2017–2018) experiment was conducted to investigate the vertical migration and leaching of nitrogen in paddy fields under water-saving and straw return conditions. Treatments included traditional flood irrigation (FI) and two water-saving irrigation regimes: rain-catching and controlled irrigation (RC-CI) and drought planting with straw mulching (DP-SM). RC-CI and DP-SM both significantly decreased the irrigation input compared with FI. RC-CI increased the rice yield by 8.23%~12.26%, while DP-SM decreased it by 8.98%~15.24% compared with FI. NH4+-N was the main form of the nitrogen leaching loss in percolation water, occupying 49.06%~50.97% of TN leaching losses. The NH4+-N and TN concentration showed a decreasing trend from top to bottom in soil water of 0~54 cm depth, while the concentration of NO3−-N presented the opposite behavior. The TN and NH4+-N concentrations in percolation water of RC-CI during most of the rice growth stage were the highest among treatments in both years, and DP-SM showed a trend of decreasing TN and NH4+-N concentrations. The NO3−-N concentrations in percolation water showed a regular pattern of DP-SM > RC-CI > FI during most of the rice growth stage. RC-CI and DP-SM remarkably reduced the amount of N leaching losses compared to FI as a result of the significant decrease of percolation water volumes. The tillering and jointing-booting stages were the two critical periods of N leaching (accounted for 74.85%~86.26% of N leaching losses). Great promotion potential of RC-CI and DP-SM exists in the lower reaches of the Yangtze River, China, and DP-SM needs to be further optimized.

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Biochar mitigates dissolved organic carbon loss but does not affect dissolved organic nitrogen leaching loss caused by nitrogen deposition in Moso bamboo plantations

Global Ecology and Conservation ◽

10.1016/j.gecco.2018.e00494 ◽

2018 ◽

Vol 16 ◽

pp. e00494

Author(s):

Zhaofeng Lei ◽

Quan Li ◽

Xinzhang Song ◽

Weifeng Wang ◽

Zhiting Zhang ◽

...

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

Nitrogen Deposition ◽

Dissolved Organic Nitrogen ◽

Organic Nitrogen ◽

Nitrogen Leaching ◽

Moso Bamboo ◽

Carbon Loss ◽

Leaching Loss

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Biostimulants decreased nitrogen leaching and NH3 volatilization but increased N2O emission from plastic-shed greenhouse vegetable soil

Environmental Science and Pollution Research ◽

10.1007/s11356-021-16039-y ◽

2021 ◽

Author(s):

Jiyuan Xu ◽

Ju Min ◽

Haijun Sun ◽

Bhupinder Pal Singh ◽

Hailong Wang ◽

...

Keyword(s):

N2o Emission ◽

Nitrogen Leaching ◽

Nh3 Volatilization ◽

Vegetable Soil ◽

Greenhouse Vegetable

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Correction to: Biostimulants decreased nitrogen leaching and NH3 volatilization but increased N2O emission from plastic-shed greenhouse vegetable soil

Environmental Science and Pollution Research ◽

10.1007/s11356-021-16462-1 ◽

2021 ◽

Author(s):

Jiyuan Xu ◽

Ju Min ◽

Haijun Sun ◽

Bhupinder Pal Singh ◽

Hailong Wang ◽

...

Keyword(s):

N2o Emission ◽

Nitrogen Leaching ◽

Nh3 Volatilization ◽

Vegetable Soil ◽

Greenhouse Vegetable

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Nitrogen Leaching Loss Estimation from Paddy Soil in the Taihu Lake Region of China by a Newly Developed Simple Model

Journal of Agronomy Research ◽

10.14302/issn.2639-3166.jar-19-3097 ◽

2019 ◽

Vol 2 (3) ◽

pp. 19-30

Author(s):

Wen-Ming Xie ◽

You Ma ◽

Shi-Jun Li ◽

Wei-Ming Sh ◽

...

Keyword(s):

Paddy Soil ◽

Taihu Lake ◽

Agricultural Land ◽

Surface Water Quality ◽

Exponential Model ◽

Nitrogen Leaching ◽

Loss Estimation ◽

N Leaching ◽

Leaching Loss ◽

Lake Region

Nitrogen leaching as a direct pathway of N loss from agricultural land can negatively affect groundwater and surface water quality. However, a simple and efficient method for nitrogen leaching loss estimation is still inefficient. In this study, an exponential model was developed using the experimental data from a two-year field experiment conducted in the Taihu Lake region of China to simulate the N leaching from the paddy soil. The results showed the leached N was in the range of 5.66 to 8.45 kg N/ha during the whole rice season, which was accounted for 1.7%-2.1% of the applied N. A good agreement between the measured and model predicted results for N leaching loss was observed, suggesting the validity of the established model. The model was further validated with the data of other studies in other regions. The results demonstrated this model is able to simulate the N leaching loss accurately and can provide a beneficial tool for users to predict N leaching loss in paddy soil.

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