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| Effects of Interaction between Root Mineral Elements and Microorganisms on Tomato Growth and Quality under Root Restriction Treatment |
| GAO Yaqing1，2，JI Yanhai1，2，ZHOU Xinyuan1，2，LIANG Hao1，2，LIU Mingchi1，2* |
| （1Vegetable Institute of Beijing Academy of Agriculture and Forestry，Beijing 100097，China；2North China Key Laboratory of Urban Agriculture，Ministry of Agriculture and Rural Affairs，Beijing 100097，China） |
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Abstract This study took‘Ruifen 882’tomato as test material，and adopted root-restricting cultivation method by 4 treatments of 0.5 L，1 L，4 L，and 15 L（CK）to study the the effects of root mineral elements and microorganisms on growth and quality of tomato plant under different root restriction treatments．The results showed that all root restriction treatments had significantly reduced the plant height，leaf area and single fruit quality of tomato plants；but could improve fruit quality in various degrees. By 0.5 L root restriction treatment the contents of soluble solid，soluble sugar and VC in fruit were significantly higher than that of the contrast，increasing 35.48%，36.09% and 29.69%，respectively．After root restriction，the EC value of root suspension liquid had increased，pH value decreased，and root activity increased．But，the absorption ratios of total nitrogen，total phosphorus and total potassium were different，among which the contents of total nitrogen and total potassium in root were increased，and total phosphorus content was decreased．In root microbiological aspect，root restriction cultivation increased the number of bacteria and actinomyces，but decreased the number of fungi．The comprehensive analysis showed that the roots of tomato plants were restricted by vertical and horizontal directions，and high salt content and unbalanced nutrient content under root micro-environment had resulted in growth of short and small plants．But，0.5 L root-limiting volume could significantly increase the contents of soluble solid，soluble sugar and VC in fruit．
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Received: 21 July 2022
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