| Effects of biochar on seedling quality and root physiological characteristics of melon |
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| DOI：10.7606/j.issn.1000-7601.2022.05.23 |
| Key Words: melon biochar seedling quality root physiological characteristics |
| Author Name | Affiliation | | MA Guangshu | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LIANG Xiao | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | ZHANG Ting | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LI Runzhe | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LIAN Hua | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Different biochar amounts (0, 10, 20, 40 g·kg-1 and 80 g·kg-1， respectively) were added to the seedling nutrient soil to evaluate the effects of biochar on soil physical properties, root surface area, root physiological indexes and seedling quality of melon seedlings through pot culture from April to July 2021. The results showed that different amounts of biochar improved soil physical properties. Among them, the treatment of 80 g·kg-1 was the most effective, with soil pH and water content increased by 1.86% and 3.16% respectively compared with CK, and the soil bulk density decreased by 5.93% compared with CK. Compared with CK, different amounts of biochar improved the physiological characteristics of muskmelon roots, and the treatment of 40 g·kg-1 was the most effective. The root activity, nitrate nitrogen content, nitrate reductase activity (NR), catalase activity (CAT), peroxidase activity (POD), superoxide dismutase activity (SOD), ascorbate peroxidase activity (APX) and polyphenol oxidasea activity (PPO) of melon root increased by 20.88%, 5.70%, 126.67%, 10.47%, 23.42%, 31.58%, 54.21% and 62.88% respectively at 25 days after emergence. Compared with CK, different amounts of biochar improved the root surface area of muskmelon seedlings, and the treatment of 40 g·kg-1 was the most effective. The root volume, total root absorption area, active absorption area, percentage of active absorption area and root specific surface increased by 21.07%, 40.19%, 71.82%, 22.56% and 15.76% respectively compared with CK at 25 days after emergence. Compared with CK, different amounts of biochar could improve melon seedling quality, and the treatment of 40 g·kg-1 was the most effective. The plant height, stem diameter, leaf area, whole plant fresh weight, whole plant dry weight, root shoot ratio and strong seedling index increased by 34.87%, 31.71%, 33.91%, 31.92%, 45.10%, 64.94% and 43.33% respectively compared with CK at 25 days after emergence. The research results showed that the biochar application promoted the morphogenesis of melon seedlings, enhanced the quality of seedlings by regulating root physiological activity and improved rhizosphere soil environment. |
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