Crops ›› 2024, Vol. 40 ›› Issue (1): 214-219.doi: 10.16035/j.issn.1001-7283.2024.01.028

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Experimental Study on Nitrogen Leaching Loss from Paddy Soil Solution for Different Irrigation Modes Based on Biochar

Yu Huawei1(), Zhu Shijiang1,2, Sun Aihua1,2(), Li Hu1,2, Zhong Yun1,2, Ye Xiaosi1, Hua Xin1, Zhang Tao3, Liu Changlin3   

  1. 1College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, Hubei, China
    2Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region, Ministry of Education, Yichang 443002, Hubei, China
    3Dongfeng Canal Irrigation District Management Station of Yichang, Yichang 443002, Hubei, China
  • Received:2022-09-28 Revised:2022-10-23 Online:2024-02-15 Published:2024-02-20
  • Contact: Sun Aihua E-mail:1850752780@qq.com;511373960@qq.com

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Abstract:

To explore the effects of biochar application on nitrogen leaching in paddy soil under different water management modes, three biochar application levels (B0: without biochar application, B1: biochar/soil was 2%, B2: biochar/soil was 4%) and three water management modes (W1: conventional water management, W2: mild water deficit, W3: severe water deficit) were set up in the experiment. Three years field experiment was conducted to analyze the leaching law of soil nitrogen in different treatments. The results showed that the variation trend of NH4+ concentration in paddy soil under different water management modes was similar, and reached the maximum on the 35th day after tillering. Under the same biochar application level, the degree of water deficit was negatively correlated with the cumulative leaching of NH4+ and NO3-. The more water lacks, the smaller the cumulative leaching of nitrogen ions in paddy soil. Under the condition of B1 treatment, the cumulative leaching loss of NH4+ and NO3- in W3 water management mode was 26.87% and 22.40% lower than that in W1. Under the condition of B2 treatment, the cumulative leaching loss of NH4+ and NO3- in W3 water management mode were 21.09% and 18.27%, lower than that in W1, respectively. Under the same biochar application level, the nitrogen leaching amount of paddy soil decreased with the increase of water deficit.

Key words: Biochar, Water management, Paddy soil, Nitrogen leaching loss, Water-saving irrigation

Table 1

Different treatment combinations"

处理
Treatment		 生物炭施加量
Biochar application amount		 水分管理模式
Moisture management mode
T1 B0 (0%) W1
T2 B1 (2%) W1
T3 B2 (4%) W1
T4 B0 (0%) W2
T5 B1 (2%) W2
T6 B2 (4%) W2
T7 B0 (0%) W3
T8 B1 (2%) W3
T9 B2 (4%) W3

Fig.1

Dynamic change processes of NH4+ and NO3- concentrations and cumulative leaching loss in soil solution without biochar application"

Fig.2

Dynamic change processes of NH4+and NO3- concentrations and cumulative leaching loss in biochar soil solution at B1 level"

Fig.3

Dynamic change process of NH4+and NO3- concentrations and cumulative leaching loss in biochar soil solution at B2 level"

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