| Effects of applying municipal sludge on physiological characteristics and qualities of leaf lettuce |
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| DOI：10.7606/j.issn.1000-7601.2013.03.29 |
| Key Words: municipal sludge sludge dosage leaf lettuce physiological characteristics vegetable qualities |
| Author Name | Affiliation | | YI Xiu | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xi’an, Shaanxi 710054, China | | XU Jingjing | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China | | WEI Mao | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China | | WANG Yuke | Shaanxi Province Environmental Monitoring Center, Xi’an, Shaanxi 710054, China |
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| Abstract: |
| Effects of applying municipal sludge on physiological characteristies and qualities of leaf lettuce were investigated by using pot experiments. The results showed:(1)applying
municipal sludge to soil did not make significant
difference for leaf lettuee to uptake Zn, Cu, Pb, Cd, As, Hg and Ni with different sludge dosage. (2)In the first phase of experiment, determining values of various indieators of leaf lettuce
growth was inereased first and then decreased with increasing amount of sludge usage. When sludge dosage was 6 g·kg-1, germination rate of leaf lettuce reached its maxi-mum, 93%. The total roots absorbing area and active absorbing area of leaf lettuce reached maximum, 1.93 cm2·plant-1 and 0.88 cm2·plant-1, respectively, when sludge dosage was 9 g·kg-1. When sludge dosage was 6 g·kg-1, the maximum of chlorophyll a and b and soluble sugar content was 1.39 mg·g-1 and 7.90 mg·g-1, respectively;The maximum of soluble protein content was 25.38 mg·g-1 when sludge dosage was 9 g·kg-1. (3)In the second phase of experiment, alternation patterns of all indicators by using different portions of sludge were similar to the patterns observed in the first phase of experiment, but actual measured values of all these indicators were bigger than that of the first phase experiment, and sludge dosage from which the leaf lettuce showed the maximum growth indicators lagged behind. (4)After had comprehensively analyzed all the indicators, we concluded that optimal sludge dosage ranges from 6 to 9 g·kg-1 and using sludge was beneficial to the growth and the quality of leaf lettuce. |
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