|
| Effects of rice straw biochar on tomato yield and quality in farmland affected by Cd contamination |
| Received:July 26, 2021 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar;Cd;tomato;yield;soil physicochemical properties |
| Author Name | Affiliation | E-mail | | WU Weijian | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | CHEN Yijie | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | LI Gaoyang | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | ZHANG Weijian | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | LIN Haihong | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | LIN Zhong | College of Chemistry and Environmental Sciences, Guangdong Ocean University, Zhanjiang 524088, China | | | ZHEN Zhen | College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China | zz19830302@163.com |
|
| Hits: 955 |
| Download times: 954 |
| Abstract: |
| This study explored the effects of different proportions of biochar on the yield, quality, and Cd accumulation of a tomato species (Lycopersicon esculentum mill.) in Cd contaminated soil. The effects of biochar on these variables as well as the soil physicochemical properties and enzymes activities were studied using pot experiments under four treatments(CK:no biochar added; T1:1% biochar; T2:3% biochar; T3:5% biochar). The results showed that the tomato yield and quality were significantly improved by adding biochar. For instance, the quality parameters of vitamin C, lycopene, soluble protein, soluble sugar content, and sugar/acid ratio increased significantly by 24.7%, 114.4%, 12.0%, 37.4%, and 80.0%, respectively, in the T2 treatment compared with the CK treatment. Biochar addition effectively reduced the Cd contents of the tomato roots, stems, and fruit, with the most significant reductions observed in the T3 treatment. During the late fruit period, the Cd contents of the tomato roots, stems, and fruit in the T3 treatment were 1.31, 0.33 mg·kg-1, and 0.03 mg·kg-1, respectively. In addition, the biochar treatments alleviated Cd stress in soil and significantly enhanced the soil physicochemical properties(pH and humus), nutrient contents(alkali-hydrolysable nitrogen, available phosphorus, and available potassium), and enzymes activities(urease, catalase, sucrase, and cellulase) throughout the entire growth period. In the T2 treatment during the late fruit period, the contents of alkalihydrolysable nitrogen(47.42 mg·kg-1), available phosphorus(165.85 mg·kg-1), and available potassium(167.76 mg·kg-1) in soil, and the activities of urease(6.28 mg·g-1·d-1), catalase(3.20 mg·g-1·20 min-1), sucrase(1.07 mg·g-1·d-1), and cellulase(2.13 mg·g-1·d-1) were all significantly higher than those of the other treatments. The T3 treatment had the most significant effect on the pH and humus content of soil, but there was no significant difference with the T2 treatment, which were 7.15 and 24.56 g·kg-1, respectively. Biochar addition significantly reduced the Cd content in tomato plants, enhanced the soil physicochemical properties, and further increased the tomato yield and quality, with the best effects achieved in the 3% biochar treatment. Moreover, biochar addition significantly increased the soil enzymes activities and improved the soil ecological environment. |
|
|
|
