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The study was aimed to explore the effects of applying different organic fertilizers on the yield, quality, soil fertility of sweet potato. Five different organic fertilizer treatments with no fertilization as the control were set up and sweet potato variety Qianshu 6 was used. The results showed that the application of organic fertilizer could effectively promote the growth of sweet potato vines and the expansion of root tubers. The yield of Shangcanli biological organic fertilizer (T4) was the highest, which was 19.9% higher than that of the control. The effects of different organic fertilizers on the nutritional quality of sweet potato were different, but the accumulation of dry matter was not obvious. In addition, planting sweet potato significantly reduces the nutrient content of soil, while applying different organic fertilizers could supplement part of the nutrient requirements of sweet potato, but had no significant impact on soil pH value. Organic fertilization significantly increased the contents of soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN). Organic fertilization significantly increased the activities of urease (URE), acid phosphatase (ACP), N-acetylglucosidase (NAG) and cellobiase (CBH), but significantly decreased the activities of nitrate reductase (NR) and-Glucosidase (BG), while did not significantly affected the activityof other enzymes. Correlation analysis showed that the effects of different components of organic fertilizer on the yield and quality of sweet potato root tubers were quite different. The pH value of fertilizer and the amount of organic matter input mainly affected the quality of root tubers, while the amount of pure nitrogen input was closely related to the yield and quality of root tubers. The physical and chemical properties of soil were mainly affected by the pH value of organic fertilizer, the input amount of organic matter and pure nitrogen, but had little correlation with the input amount of pure phosphorus and pure potassium. The correlation between organic fertilizer and soil MBC, soil URE, ACP, NR, PPO and LAP was stronger than that of soil microbial biomass nitrogen (MBN), N-acetylglucosidase (NAG), cellobiase (CBH) and polyphenol oxidase (PPO). Different organic fertilizers promoted the growth of sweet potato, increased the yield of sweet potato, increased the nutrient content of soil, and changed the microbial environment of soil to a certain extent. Therefore, the correlation analysis results of indicators could provide references for sweet potato production.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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