Subtropical Plant Science >

2026 , Vol. 55 >Issue 2: 193 - 202

DOI: https://doi.org/10.3969/j.issn.1009-7791.2026.02.007

Research articles

Effects of Different Concentrations of Residual Sludge on the Growth and Yield of Two Oilseed Crops

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  • (1. College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, Gansu China; 2. College of Environment and Urban Construction, Lanzhou City University, Lanzhou 730070, Gansu China)

Received date: 2025-11-27

  Accepted date: 2026-01-26

  Online published: 2026-04-30

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Abstract

In order to determine the optimal application concentration of residual sludge in oilseed crop production, pot experiments were conducted to investigate the effects of different residual sludge concentrations (0%, 25%, 50%, 75%, and 100%) on the growth, physiological characteristics, yield, and quality of rapeseed and sunflower, while also assessing environmental risks. Results indicated that increasing residual sludge concentration significantly elevated soil organic matter and available nitrogen, phosphorus, and potassium levels, while slightly decreasing soil pH and markedly increasing electrical conductivity. Total and available forms of Cd, Pb, Cu, and Zn in soil increased, though none exceeded national agricultural safety standards. Crop physiological indicators exhibited a pronounced dose-response effect to residual sludge concentration. At the 75% treatment level, rapeseed and sunflower exhibited the highest chlorophyll content, net photosynthetic rate, and antioxidant enzyme activity, along with the lowest malondialdehyde content. Correspondingly, crop growth and yield significantly increased, with per-plant yields of rapeseed and sunflower increasing by 62.9% and 37.9%, respectively, compared to the control. Oil and protein content in seeds also increased simultaneously. Comprehensive analysis indicates that under the experimental conditions, a 75% residual sludge concentration ratio enhances oilseed crop yield and quality while maintaining controllable environmental risks. This concentration is thus considered an appropriate application level for residual sludge resource utilization in oilseed crop production.

Key words： residual sludge; oil crops; photosynthetic traits; stress-resistant physiology; yield and quality; resource utilization

Cite this article

WANG Hong-kai, QIU Jian-meng, WANG Jin-xiang, WEI Wen-yu, CHANG Guo-hua . Effects of Different Concentrations of Residual Sludge on the Growth and Yield of Two Oilseed Crops[J]. Subtropical Plant Science, 2026 , 55(2) : 193 -202 . DOI: 10.3969/j.issn.1009-7791.2026.02.007

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