Direct seeding for rice production increased soil erosion and phosphorus runoff losses in subtropical China

Wei, Zhou; Guo, Zhi; Ji, Chen; Jiang, Jiang; Hui, Dafeng; Wang, Xin; Jiang, Sheng; LiuGen, Chen; Luo, Yiqi; Zheng, Jufeng; Shi-feng, LI; Zhang, Yuefang

doi:10.1016/j.scitotenv.2019.133845

Cited by 29 publications

(29 citation statements)

References 41 publications

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“…Some small-scale in-situ experiments showed that total P (TP) runoff losses ranged from 0.18 to 1.51 kg ha −1 and PP runoff losses accounted for 58%-77% of the seasonal TP lost. They further revealed that nutrient loss loading varied with seasons [12].…”

mentioning

confidence: 96%

“…Nitrogen and phosphorus losses from paddy fields usually occur predominantly through surface runoff rather than infiltration because of a plow pan that prevents downward water infiltration [11]. Some studies have shown that N and P runoff losses are affected by soil and climatic parameters, as well as agricultural practices, including soil texture, cover crops, application rate of N and P fertilizers, timing and method, soil tillage, irrigation regimes, and rainfall intensity and amount [12][13][14]. Some small-scale in-situ experiments showed that total P (TP) runoff losses ranged from 0.18 to 1.51 kg ha −1 and PP runoff losses accounted for 58%-77% of the seasonal TP lost.…”

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confidence: 99%

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Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2019

Preprint

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Background Rice paddy wetlands may serve as a nutrient source or sink in agricultural ecosystems. However, the pattern of nutrient loss on a large scale is not clear. A year-round on-site observation study based on 6 h intervals was conducted. Rainfall, temperature, runoff nutrient concentrations, and adjacent stream water samples were automatically monitored to uncover the temporal changes in the runoff losses of the main nutrient proxies (total N and total P) from a typical rice-planting area (120 ha) in the Yangtze river delta region of China.Results A high total N concentration in the rice-planting area was observed during the rice-planting season; however, a larger fluctuation in the total P was evident throughout the year. The Δtotal N (drainage minus stream) parameter showed negative values with a mean of −0.25 mg L −1 , while Δtotal P showed positive values with a mean of 0.06 mg L −1 . The window phases for the total N loss are mainly concentrated in the rice-growing season. However, the window phase for the total P loss was more dispersive throughout the year. No clear relationships were found between rainfall and N and P concentrations by self-organizing map analysis.Conclusions This high-resolution monitoring suggested that nutrient loss loading, rather than nutrient concentration, was strongly related to runoff depth, and the avoidance of fertilization before high-intensity rainfall could mitigate the nutrient runoff losses and maintain the rice wetland eco-function.

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confidence: 96%

mentioning

confidence: 99%

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Nitrogen and phosphorus losses from paddy fields usually occur predominantly through surface runoff rather than infiltration because of a plow pan that prevents downward water infiltration [13]. Some studies have shown that N and P runoff losses are affected by soil and climatic parameters, as well as agricultural practices, including soil texture, cover crops, the application rate of N and P fertilizers, timing and method, soil tillage, irrigation regimes, and rainfall intensity and amount [14][15][16]. A smallscale in-situ experiment show that total P (TP) runoff losses ranged from 0.18 to 1.51 kg ha −1 , and particulate P (PP) runoff losses accounted for 58-77% of the seasonal TP lost [14].…”

mentioning

confidence: 99%

“…Some studies have shown that N and P runoff losses are affected by soil and climatic parameters, as well as agricultural practices, including soil texture, cover crops, the application rate of N and P fertilizers, timing and method, soil tillage, irrigation regimes, and rainfall intensity and amount [14][15][16]. A smallscale in-situ experiment show that total P (TP) runoff losses ranged from 0.18 to 1.51 kg ha −1 , and particulate P (PP) runoff losses accounted for 58-77% of the seasonal TP lost [14]. They further reveal that nutrient loss loading varied with seasons [14].…”

mentioning

confidence: 99%

“…A smallscale in-situ experiment show that total P (TP) runoff losses ranged from 0.18 to 1.51 kg ha −1 , and particulate P (PP) runoff losses accounted for 58-77% of the seasonal TP lost [14]. They further reveal that nutrient loss loading varied with seasons [14]. However, current research on nutrient runoff in large-scale rice-planting areas has been rarely performed.…”

mentioning

confidence: 99%

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Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2020

Preprint

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Background: Rice paddy wetlands may serve as a nutrient source or sink in agricultural ecosystems. However, the pattern of nutrient loss on a watershed scale is not clear. A year-round on-site observation study based on 6-h intervals was conducted. Rainfall, temperature, runoff nutrient concentrations, and adjacent stream water samples were automatically monitored to uncover the temporal changes in the runoff losses of the predominant nutrient proxies (total N and total P) from a typical rice-planting area (120 ha) in the Yangtze delta region of China. Results: A high total N concentration in the rice-planting area was observed during the rice-planting season; however, significant fluctuation in the total P was evident throughout the year. The Δtotal N (drainage minus stream) parameter showed negative values with a mean of −0.25 mg L -1 , while Δtotal P showed positive values with a mean of 0.06 mg L −1 . The annual average N and P runoff from paddy field were 11.6 kg ha −1 and 1.5 kg ha −1 , respectively. The window phases for the total N loss were mainly concentrated in the rice-growing season. However, the window phase for the total P loss was more dispersive throughout the year. No apparent relationships were found between rainfall and N and P concentrations by self-organizing map analysis. Conclusions: The high-resolution monitoring, in this study, suggested that nutrient loss loading rather than nutrient concentration, was strongly related to surface runoff Therefore, fertilization before high-intensity rainfall should be avoided to mitigate the nutrient runoff losses and maintain the rice wetland eco-function.

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Improving grain yield and nitrogen use efficiency of direct‐seeded rice with simplified and nitrogen‐reduced practices under a double‐cropping system in South China

Nongrong

Zhong

et al. 2023

J Sci Food Agric

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Background Enhancing grain yield and nitrogen use efficiency (NUE) of rice is of great importance for sustainable agricultural development. Little effort has been made to increase grain yield and NUE of direct‐seeded rice under the double‐cropping system in South China. Field trials were conducted during 2018–2020 with four treatments, including nitrogen‐free, farmers' fertilization practice (FP), ‘three controls’ nutrient management (TC), and simplified and nitrogen‐reduced practice (SNRP). Results Grain yield under SNRP averaged 6.46 t ha−1 during the three years and was 23.0% higher than that of FP but comparable to that of TC. Recovery efficiency (REN), agronomic efficiency (AEN), and partial factor productivity (PFPN) of nitrogen under SNRP increased by 12.0–22.7%, 159.3–295.0% and 94.6–112.5% respectively compared with FP. Harvest index and sink capacity increased by 7.3–10.8% and 14.9–21.3% respectively. Percentage of productive tillers (PPT) and biomass after heading increased by 24.0% and 104.5% respectively. Leaf nitrogen concentration at heading and nitrogen accumulation after heading increased by 16.3% and 842.0% respectively. Grain yield was positively correlated with PPT, sink capacity, harvest index, biomass and nitrogen accumulation after heading, REN, AEN, and PFPN. Conclusion Grain yield and NUE under SNRP were superior to those under FP and comparable to those under TC. Increase in sink capacity, higher PPT, more biomass and nitrogen accumulation after heading, and greater harvest index were responsible for high grain yield and NUE in SNRP with reduced nitrogen fertilizer and labor input. SNRP is a feasible approach for direct‐seeded rice under a double‐cropping system in South China. © 2023 Society of Chemical Industry.

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Direct seeding for rice production increased soil erosion and phosphorus runoff losses in subtropical China

Cited by 29 publications

References 41 publications

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Improving grain yield and nitrogen use efficiency of direct‐seeded rice with simplified and nitrogen‐reduced practices under a double‐cropping system in South China

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