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| Effects of sludge-derived polypeptide water-soluble fertilizer application on brassica napus growth and soil nutrients dynamics |
| Received:February 10, 2025 Revised:April 28, 2025 |
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| KeyWord:sludge;polypeptide water-soluble fertilizer;brassica napus;photosynthetic pigments;nitrogen uptake efficiency |
| Author Name | Affiliation | E-mail | | ZHANG Qiuxian | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | ZHAO Congxu | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | YUAN Tian | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | ZHANG Mengjiao | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | WANG Xuerong | Agricultural Technology Extension Center of Shulan City, Jilin Province, Shulan 132600, China | | | YAN Shuangdui | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | LIU Na | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | | | CAO Yanzhuan | College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China | caoyanzhuan@126.com |
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| Abstract: |
| To study the safe application methods of alkaline water-soluble fertilizers derived from sludge and the effects of spraying frequency on crops. This study employed a two-factor experimental design involving different dilution ratios（200×, 400×, and 600×）and application frequencies（twice versus four times） of the polypeptide fertilizer during distinct growth stages of brassica napus to systematically investigate its effects on yield, chlorophyll content, soluble sugars, and soil nutrient dynamics. Results demonstrated that the combined soil and foliar application significantly enhanced chlorophyll content, soluble sugar accumulation, and yield in brassica napus. The most pronounced improvements were observed with dual foliar sprays of 200×diluted fertilizer coupled with soil application, showing 52.02%, 178.34%, and 95.23% increases compared to the non-fertilized control, respectively. The 200×dilution with dual applications significantly elevated whole-plant nutrient concentrations, reaching 4.35 g · kg-1 total nitrogen（74.25% increase）, 0.94 g · kg-1 total phosphorus（40.30% increase）, and 2.30 g·kg-1 total potassium（16.16% increase）versus the control. This treatment also achieved peak nitrogen accumulation（1 042.22 mg·plant-1）and nitrogen uptake efficiency（15.56%）. The combined application modality also improved soil fertility parameters, including organic matter content, total nitrogen, and alkali-hydrolyzable nitrogen, with the 200×dilution treatment producing statistically significant enhancements（P<0.05） in all measured indices. The application of sludge-derived polypeptide fertilizers in vegetable production systems demonstrates triple benefits：yield augmentation, quality improvement, and stress resistance enhancement, while establishing a novel pathway for China's sludge valorization and environmentally sound management. |
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