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| Effect of Quantity of Compost Contaminated with Herbicide on Bioavailability of Cucumber |
| WANG Zhi-zhong1，LYU Xiao1，DU Long-long1，LI Yan-ming1*，Fredrick C. Michel Jr.2 |
（1College of Resources and Environmental Sciences， China Agricultural University， Beijing 100193， China；2Department
of Food， Agriculture and Biological Engineering， Ohio State University，Wooster 44691， OH， USA） |
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Abstract Nowadays chemical weed control is one of the most indispensable methods in
modern agriculture．However，the compost or manure would be polluted by herbicide residual
in the non-target plants．Improper use of the polluted compost may have serious negative effects
on growth of next-stubble crops．In this research，compost contaminated by herbicide was used
in nursery substrate with different proportions to investigate the sensitivity levels of the plants.
Basically we set 3 conditions to test cucumbers on their germin ation rate，internode length，height，
stem diameter，dry weight，leaf number，leaf area，curl and seedling index after sowing in 45
days．These 3 conditions are non-polluted compost condition（C1），Aminopyralid polluted
condition（C2）and Clopyralid polluted condition（C3），and 0，5%，10% and 20% usage of compost are used respectively under these 3 conditions．Results show that the more polluted compost we used，the lower germination rate is. Moreover，symptoms of herbicide damages of
cucumber seedling are found from the delicate plant， small and curl leaves．With the same usage of compost，Aminopyralid tends to have more serious influence on cucumber comparing to Clopyralid，which means the more effective herbicide are used in the compost，the graver influence will be
presented on the following sensitive plants. So we can draw the following conclusions: the compost
contaminated with compound herbicide suppresses the germination rate of cucumber seeds. It can
significantly inhibit the growth of seedlings of cucumber and reduce its seedling index at a lower concentration.
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Received: 14 May 2013
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