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| Improvement effects of combined conditioners on fertility quality of degraded tea garden soil |
| Received:September 13, 2024 |
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| KeyWord:degraded tea garden;compound conditioner;organic materials;limestone powder |
| Author Name | Affiliation | E-mail | | SHANG Xiaolan | Hangzhou Agricultural Technology Extension Center, Hangzhou 310020, China | | | LI Dan | Hangzhou Agricultural Technology Extension Center, Hangzhou 310020, China | | | ZHOU Huaping | Xiaoshan Agricultural & Forestry Technology Extension Center, Xiaoshan 311200, China | | | XU Zhu | Xiaoshan Agricultural & Forestry Technology Extension Center, Xiaoshan 311200, China | | | ZHANG Mingkui | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | mkzhang@zju.edu.cn | | LIU Yonghong | Agricultural Technology Extension Center of Tonglu County, Tonglu 311500, China | |
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| Abstract: |
| Due to the widespread problems of soil acidification, low organic matter, poor structure, and lack of coordination in water, fertilizer, gas, and heat in degraded tea gardens in southern hilly areas. For this purpose, this study takes a degenerated tea plantation in Zhejiang Province as an example to study the effects of different improvers, such as biomass carbon, commercial organic fertilizer and limestone powder, on soil qualities of the tea garden, a field experiment was carried out to study the effect of combined conditioner on soil fertility improvement in the degraded tea garden. Compared with the non-application of the modifiers, different combinations of modifiers, such as organic materials and limestone powder, were helpful to improve the fertility quality of the degraded tea garden. In general, biomass charcoal and commercial organic fertilizer had significant differences in improving soil properties. The effects of reducing soil bulk density and increasing soil organic carbon and saturated water conductivity decreased in the order of biomass carbon > commercial organic fertilizer. Compared with the non-application of the modifiers, after the treatments of biomass carbon+limestone powder+straw mulching, biomass carbon + limestone powder and commercial organic fertilizer + limestone powder, soil bulk density were decreased by 14.68%, 11.19% and 9.79%, soil organic carbon were increased by 33.33%, 31.68% and 14.71%, soil saturated water conductivity were increased by 17.63, 15.51 mm·d-1 and 14.07 mm·d-1；but high application of biomass carbon might have a negative impact on the quality of soil organic carbon（ie, reducing the proportion of humus carbon in the total organic carbon）. The effects of increasing total nitrogen, alkaline hydrolysis nitrogen, available phosphorus decreased in the order of commercial organic fertilizer > biomass charcoal. The most effect of increasing saturated water holding capacity was biomass charcoal. Compared with the non-application of the modifiers, after the treatments of biomass carbon + limestone powder + straw mulching, biomass carbon + limestone powder and commercial organic fertilizer + limestone powder, soil saturated water holding capacity were increased by 10.49%, 9.03% and 7.89%. The effect of biomass charcoal application on increasing soil CEC was better than that of commercial organic fertilizer application. In addition, the application of lime and biomass charcoal could significantly improve the soil pH value. The application of lime could improve the soil CEC and available nutrients. Compared with the non-application of the modifiers, after the treatments of biomass carbon+limestone powder+straw mulching, biomass carbon+limestone powder and commercial organic fertilizer+limestone powder, tea yield were increased by 71.4%%, 71.4% and 57.14%. Based on the soil quality data and tea yield, it is suggested that the combination of biomass charcoal, limestone powder, and straw mulching should be applied in the improvement of the degraded tea garden soil. |
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