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| Effects of Digested Sludge Pretreated With O3/UV on Yield and Quality of Gynura Cusimbua Under HydroPonic Conditions |
| Received:February 16, 2015 |
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| KeyWord:O3/UV;sludge;hydroponics;Gynura cusimbua |
| Author Name | Affiliation | E-mail | | YANG Peng | College of Agronomy, Northwest A&F University, Yangling 712100, China
Institute of Agro-environmental Protection, MOA, Tianjin 300191, China, | | | WANG Dong-qi | College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China | | | QIU Ling | College of Agronomy, Northwest A&F University, Yangling 712100, China
College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China | QL2871@126.com | | ZHANG Ke-qiang | Institute of Agro-environmental Protection, MOA, Tianjin 300191, China, | |
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| Abstract: |
| Digested sludge is rich in organic matter and plant nutrients, and thus applying sludge to agricultural soils has been considered to be an environmentally and agronomically acceptable option for sludge disposal. However, sludge often contains pathogens and parasites, limiting its agricultural applications. In this study, an experiment was designed to examine the effect of sludge pretreated with combined O3/UV on the growth, yield and quality of Gynura Cusimbua under hydroponic conditions. Hoagland nutrient solution was used as control. Compared with the control, sludge treatments improved the content of vitamin C, chlorophyll, and soluble protein in Gynura Cusimbua by 0.43 mg·100 g-1, 7.70 SPAD, and 5.35 mg·g-1, respectively. Fresh weights of per plant and its aboveground part increased with prolonged treatment time with O3/UV, with increments of up to 7.90 g and 6.71 g, respectively. When harvested on the 40 th day, fecal coliform in Gynura Cusimbua met the standard limit values for all treatments except T1(without O3/UV treatment), in which the number of fecal coliform was higher than the standards. Considering the yield, quality, and health of Gynura Cusimabua and the cost for sludge processing, sludge pretreated with O3/UV for 0.5 h is regarded to be suitable for hydroponic Gynura Cusimbua. |
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