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Journal of Integrative Agriculture
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Straw incorporation simplifies soil-rice association networks and reduces nitrogen requirements for high rice yield

Jie Li1, 2, Guiling Xu1, Yuehua Feng1, 3#, Zhengli Song1, Zhengfei Luo1, Jiali Luo1, Xiaoke Wang1, Wei Lu1, Qiangxin Luo1

1 College of Agronomy, Guizhou University, Guiyang 550025, China

2 Qiandongnan national polytechnic, Kaili 556000, China

3 Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang 550025, China

 Highlights 

l The association network of straw incorporation (SI) was simpler than that of straw removal (SR).

l SI acted as an nitrogen sponge in the soil-rice system, and SI was more sustainable than that of SR.

l The grain yield of SI was greatly affected by climate factors under high nitrogen level.

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摘要  

农业生产上提倡秸秆还田SI并配施适量氮肥以实现粮食高产、资源高效和环境友好。然而,有关秸秆还田对土壤-水稻关联网络影响的信息匮乏。在此,本研究比较和分析稻油轮作系统中SI与秸秆离田(SR)下基于土壤-水稻指标所构建的关联网络结构差异结果表明,SI土壤-水稻关联网络与SR的明显不同。具体而言,SI网络34个节点,61条边)的复杂度明显低于SR网络(56个节点,483条边),这体现在其连接性更稀疏、节点密度更低。同时秸秆还田如同给土壤-水稻系统置入了一张氮素海绵,可以吸收氮素并减少损失,进而减轻了施氮量对产量的影响,提高了产量稳定性和总产。因此,SI保持高产(平均增产2.41%的同时,还降低了系统对氮素的需求(至少降低了19.34%)。本研究证实,秸秆还田是一种有效的农业可持续发展措施,配施适量氮肥对于保障长期作物生产至关重要



Abstract  

Straw incorporation (SI) with the appropriate optimal rate of Nitrogen (N) fertilizer is recommended in agricultural production to achieve high grain yields, high resource efficiency, and environmental friendliness. However, there is little information available on the soil-rice association network under SI and straw removal (SR). This study compared and examined differences in the association networks architectures based on soil-rice indicators under SI and SR in a rice-oilseed rape rotation system. The results showed that the soil-rice association network under SI exhibited a significantly distinct structure compared to its SR counterpart. Specifically, the SI network (34 nodes, 61 edges) demonstrated ‌markedly lower complexity‌ than the SR network (56 nodes, 483 edges), as evidenced by its ‌sparser connectivity and reduced node density‌. Meanwhile, SI acted as an “N sponge” in the soil-rice system, which absorbed N inputs and prevented N losses, thereby mitigating the impact of N application rates on yield, enhancing yield stability, and increasing overall yield. Thus, while maintaining the high yield (average yield increase of 2.41%), SI simultaneously reduced the soil-rice system’s demand for N (by at least 19.34%). This study confirms that SI represents a viable strategy for agricultural sustainability and underscores the importance of integrating SI with appropriate N application rates to ensure long-term sustainable crop production.

Keywords:  straw incorporation       nitrogen application rate              yield              soil-rice system              association network  
Online: 15 November 2025  
Fund: 

This work was supported by the National Key Research and Development Plan Project Sub Topic of China (2022YFD1901500/2022YFD1901505–07), the National Natural Science Foundation of China (32260531), the Key Laboratory of Molecular Breeding for Grain and Oil Crops in Guizhou Province, China (Qiankehezhongyindi (2023)008), and the Key Laboratory of Functional Agriculture of Guizhou Provincial Higher Education Institutions, China (Qianjiaoji (2023) 007).

About author:  Jie Li, E-mail: guizhoutianxin@163.com; #Correspondence Yuehua Feng, E-mail: fengyuehua2006@126.com

Cite this article: 

Jie Li, Guiling Xu, Yuehua Feng, Zhengli Song, Zhengfei Luo, Jiali Luo, Xiaoke Wang, Wei Lu, Qiangxin Luo. 2025. Straw incorporation simplifies soil-rice association networks and reduces nitrogen requirements for high rice yield. Journal of Integrative Agriculture, Doi:10.1016/j.jia.2025.11.022

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