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    2018, Vol. 17 Issue (03): 593-602     DOI: 10.1016/S2095-3119(17)61868-9
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Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition
YANG Peng1, 2, GUO Yan-zhi3, QIU Ling 
1 College of Agronomy, Northwest A&F University, Yangling 712100, P.R.China
2 Agro-environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, P.R.China
3 Institute of Food and Nutrition Development, Ministry of Agriculture, Beijing 100081, P.R.China
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Abstract Here, the ozone-treated domestic sludge was diluted up to four different multiples and utilized as a nutritional source for hydroponic lettuce growth.  Additionally, lettuce was cultured using the modified Hoagland nutrient solution as a control.  The effects of ozone-treated domestic sludge on lettuce growth and nutrition were studied.  Results showed that the lettuce treated with modified Hoagland inorganic nutrient solution had increased leaf number, plant height, fresh weight and dry weight compared to those treated with the ozone-treated domestic sludge dilution (P<0.05).  However, the lettuce cultivated with the 2-fold ozone-treated sludge dilution showed significantly higher (P<0.05) contents of chlorophyll, soluble sugar and ascorbic acid (Vc) compared to that treated with modified Hoagland nutrient solution.  And the nitrate concentration in the lettuce cultured with the 2-fold ozone-treated sludge dilution was 53.93% less than that cultured with the modified Hoagland nutrient solution, which was a significant improvement (P<0.05).  This study suggested that the 2-fold ozone-treated sludge dilution is optimal for lettuce hydroponic nutrient requirements.
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GUO Yan-zhi
QIU Ling
Key wordsdomestic sludge     ozone     lettuce    growth characteristics     quality     hydroponic     
Received: 2017-09-26; Accepted: 2017-11-17

The work was financially supported by the Special Fund for Agro-scientific Research in the Public Interest, China (20130310104), and the Key Technology R&D Program of Tianjin, China (12ZCZDNC09600).

Corresponding Authors: Correspondence GUO Yan-zhi, E-mail: guoyanzhi@caas.cn; QIU Ling, E-mail: QL2871@126.com   
About author: YANG Peng, E-mail: yp15926@163.com
Cite this article:   
YANG Peng, GUO Yan-zhi, QIU Ling. 2018. Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition. Journal of Integrative Agriculture, 17(03): 593-602.
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/10.1016/S2095-3119(17)61868-9      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2018/V17/I03/593
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