Rational Utilization of Sediment Resources Improves Rice Yield and Nitrogen Use Efficiency under Salt Stress

Shenghai Cheng, Aibin He, Xiayu Guo, Rongyi Li, Jianbo Wang, Yucheng Qi, Pengfei Zhang, Weixu Tao, Junchao Ji, Tingcheng Zhao, Yusheng Li and Zhiyong Ai ()
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Shenghai Cheng: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Aibin He: National Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, China
Xiayu Guo: National Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, China
Rongyi Li: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Jianbo Wang: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Yucheng Qi: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Pengfei Zhang: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Weixu Tao: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Junchao Ji: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Tingcheng Zhao: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Yusheng Li: Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China
Zhiyong Ai: National Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, China

Agriculture, 2024, vol. 14, issue 2, 1-15

Abstract: Soil salinization negatively affects rice growth and yield; however, how different sludge sources regulate rice growth and yield under salt stress was rarely investigated. This study evaluated the performance of two salt-tolerant rice cultivars, Chaoyou 1000 and Longliangyou 506, grown in two sediment sources, pond sediment (PS) and river sludge (RS), under salt stress (56 ds m −1 brine irrigation) with conventional soil (CS) used as the control. The results showed that the rice yield under the PS and RS treatments was enhanced by 51.0% and 43.6% as compared with CS, respectively, owing to an improvement in spikelet per panicle, 1000-grain weight, dry matter accumulation, and the chlorophyll content in both rice cultivars. Compared with CS, the total nitrogen accumulation, nitrogen grain production efficiency, nitrogen harvest index, and nitrogen partial productivity under the PS and RS treatments were increased by 18.9–28.9%, 17.0–20.6%, 7.2–16.6%, and 43.8–50.9%, respectively. Moreover, rice grown in PS and RS showed higher activities of nitrogen metabolism-related enzymes (nitrate reductase, glutamine synthetase, and glutamate synthetase) at the heading stage and higher K + and K + /Na + contents in the leaves. Overall, a balanced utilization of sediment resources (especially pond sediment) can effectively alleviate salt stress and improve the yield and nitrogen use efficiency in rice.

Keywords: saltwater stress; sediment resources; NUE; K + /Na + ratio (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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