Fate of fertilizer nitrogen and residual nitrogen in paddy soil in Northeast China

doi:10.1016/j.jia.2023.06.010

Journal of Integrative Agriculture

2023, Vol. 22

Issue (11): 3535-3548 DOI: 10.1016/j.jia.2023.06.010

Agro-ecosystem & Environment

Advanced Online Publication | Current Issue | Archive | Adv Search

Fate of fertilizer nitrogen and residual nitrogen in paddy soil in Northeast China

BI Shi-ting^1*, LUO Xiang-yu^1*, ZHANG Chen¹, LI Peng-fei^{1, 2}, YU Cai-lian³, LIU Zhi-lei^{1, 2#}, PENG Xian-long^{1, 2#}

¹College of Agricultural Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, P.R.China
² Key Laboratory of Germplasm Enhancement, Physiology and Ecology of Food Crops in Cold Region of Ministry of Education, Northeast Agricultural University, Harbin 150030, P.R.China
³ The School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin150080, P.R.China

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摘要

在中国东北稻区，肥料氮去向与施氮量间的关系以及残留氮的去向目前仍不清晰。为此本研究田间小区和¹⁵N微区试验，分别设置0、75、105、135和165 kg N/hm²五个施氮水平，对应处理为N0、N75、N105、N135和N165。微区试验在2017年施用¹⁵N标记尿素，2018年施用等量的普通尿素。分析了氨挥发、淋洗、地表径流、水稻产量以及植物和土壤中氮含量和¹⁵N丰度变化情况。结果表明，水稻产量与氮肥施用量呈线性平台关系，最佳施氮量为135 kg N/hm²；水稻氮吸收量随着氮量的增加而增加，差减法氮肥吸收利用率（RE_N）在2017年和2018年平均分别为45.23%和56.98%。2017年施氮量为135 kg N hm²时RE_N最高，2018年RE_N受施氮量影响不大，而氮量超过135 kg N hm²时氮肥农学利用率（AE_N）和氮肥生理利用率（PE_N）显著降低。在中国东北稻区肥料氮氨挥发、淋洗和径流的损失较少。2017年和2018年氨挥发量分别占总施氮量的0.81%和2.99%，氮通过淋洗和径流的损失比例分别为4.45%和不到1.05%，东北稻区表观反硝化损率失约为42.63%。2017年0-40cm土层中残留氮量为18.37-31.81 kg/hm²，残留率为19.28-24.50%。土壤中¹⁵N肥料的残留量随施氮量增加而增加，残留氮主要集中在0-10cm土层中，占总残留氮的58.45-83.54%，并随深度增加而减少，但0-10cm土层残留氮占0-40cm土层残留氮的比例却随施氮量增加而减少。平均约有5.4%的残留氮在下一季被水稻吸收利用，50.2%流失，44.4%继续残留在土壤中，因此在计算施氮量时应考虑残留氮的数量。考虑到水稻产量与氮效率的平衡，本试验中东北稻区适宜施氮量为105-135 kg N/hm²。

Abstract

The relationship between the fate of nitrogen (N) fertilizer and the N application rate in paddy fields in Northeast China is unclear, as is the fate of residual N. To clarify these issues, paddy field and ¹⁵N microplot experiments were carried out in 2017 and 2018, with N applications at five levels: 0, 75, 105, 135 and 165 kg N ha^–1(N0, N75, N105, N135 and N165, respectively). ¹⁵N-labeled urea was applied to the microplots in 2017, and the same amount of unlabeled urea was applied in 2018. Ammonia (NH₃) volatilization, leaching, surface runoff, rice yield, the N contents and ¹⁵N abundances of both plants and soil were analyzed. The results indicated a linear platform model for rice yield and the application rate of N fertilizer, and the optimal rate was 135 kg N ha^–1.N uptake increased with an increasing N rate, and the recovery efficiency of applied N (RE_N) values of the difference subtraction method were 45.23 and 56.98% on average in 2017 and 2018, respectively. The RE_N was the highest at the N rate of 135 kg ha^–1 in 2017 and it was insignificantly affected by the N application rate in 2018, while the agronomic efficiency of applied N (AE_N) and physiological efficiency of applied N (PE_N) decreased significantly when excessive N was applied. N loss through NH₃ volatilization, leaching and surface runoff was low in the paddy fields in Northeast China. NH₃ volatilization accounted for 0.81 and 2.99% of the total N application in 2017 and 2018, respectively. On average, the leaching and surface runoff rates were 4.45% and less than 1.05%, respectively, but the apparent denitrification loss was approximately 42.63%. The residual N fertilizer in the soil layer (0–40 cm) was 18.37–31.81 kg N ha^–1 in 2017, and the residual rate was 19.28–24.50%. Residual ¹⁵N from fertilizer in the soil increased significantly with increasing N fertilizer, which was mainly concentrated in the 0–10 cm soil layer, accounting for 58.45–83.54% of the total residual N, and decreased with increasing depth. While the ratio of residual N in the 0–10 cm soil layer to that in the 0–40 cm soil layer was decreased with increasing N application. Furthermore, of the residual N, approximately 5.4% was taken up on average in the following season and 50.2% was lost, but 44.4% remained in the soil. Hence, the amount of applied N fertilizer should be reduced appropriately due to the high residual N in paddy fields in Northeast China. The appropriate N fertilizer rate in the northern fields in China was determined to be 105–135 kg N ha^–1 in order to achieve a balance between rice yield and high N fertilizer uptake.

Keywords: fate of N fertilizer NH₃ volatilization leaching surface runoff residual nitrogen yield

Received: 22 December 2022 Accepted: 07 April 2023

Fund: This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA28100302), the earmarked fund for China Agriculture Research System (CARS-01-29), the National Key Research and Development Program of China (2017YFD0200104), the Fifth (2019) of ‘Young Talents’ Project of Northeast Agricultural University, China, and the Open Program of Key Laboratory of Germplasm Enhancement, Physiology and Ecology of Food Crops in Cold Region, Ministry of Education, Northeast Agricultural University (CXSTOP2021009).

About author: #Correspondence LIU Zhi-lei, Mobile: +86-18845752275, E-mail: hlliuzhilei@126.com; PENG Xian-long, Mobile: +86-18800430515, E-mail: pxl0508@163.com * These authors contributed equally to this study.

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BI Shi-ting, LUO Xiang-yu, ZHANG Chen, LI Peng-fei, YU Cai-lian, LIU Zhi-lei, PENG Xian-long. 2023. Fate of fertilizer nitrogen and residual nitrogen in paddy soil in Northeast China. Journal of Integrative Agriculture, 22(11): 3535-3548.

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