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| Allelopathy Effects of Straw and Green Manure on Lettuce Seed |
| WEI Yun-xia，LU Jian-wei*，LI Xiao-kun，XUE Xin-xin，WANG Su-ping |
| College of Resources and Environment， Huazhong Agricultural University，Wuhan 430070， Hubei， China |
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Abstract An experiment was conducted by indoor culture to study the allelopathic effects of straw
and green manure on lettuce（Lactuca satiua L.）germination and seedling growth．Results showed
that straw and green manure extracts treatments could delay the progress of germination，even inhibit
the germination rate at high concentration．In this study，low concentration of all extract treatments intensified
the inhibit for seedling height，while for the root length they only expressed as normal inhibit．
The fresh weight and dry weight reduced of lettuce seedlings increased as the concentration of extract
treatments increased，then decreased afterwards．The extracts of rice straw，rape stalk，Chinese milk
vetch and Chinese milk vetch mixed with rape stalk at different concentrations increased the seedling
fresh weight by 27.33%，27.52%，1.28%，19.24%，respectively．Under different concentrations，
extracts of rice straw and Chinese milk vetch showed inhibit allelopathic effect on lettuce，while that
of rape stalk and Chinese milk vetch mixed with rape stalk showed promotion allelopathic effect at low
concentration. The mixture of Chinese milk vetch and rape stalk maybe an effective way to improve the
effectiveness of Chinese milk vetch or rape stalk used alone．
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Received: 24 August 2012
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