Allelopathic effects of Cinnamomum camphora leaf litter on weed germination and growth
[Objective]Weeds are one of the main hazards in agricultural production.The environmental and health problems caused by the huge amount of the chemical herbicides application are becoming increasingly prominent.The utilization of allelopathic effects to take control of the farmland weeds has become a new trend,and also a new research hotspots.[Method]In this study,a simulated pot experiment was conducted to explore the allelopathic effects of the different dosages application(3%,6%,9%,12%,m/m)of Cinnamomum camphora oily leaf powder and deoiled leaf powder on the germination and growth of farmland weeds in the garden soil seed bank.[Result]The results showed that:(1)Two types of C.Camphora leaf powder significantly inhibited the germination and growth of farmland weeds and exhibited a typical"dose effect".Their application could delay the germination time of other grass weeds except E.crusgalli for more than 8 days.(2)According to the comprehensive allelopathy index,when the addition amount was less than or equal to 6%,the inhibitory effect of deoiled leaf powder on farmland weeds was stronger than that of oily leaf powder.When the addition amount was higher or equal to 9%,the inhibitory effect of oily leaf powder was more stronger than that of deoiled leaf powder.When the same type of leaf powder was applied,the comprehensive allelopathy index increased with the increase of leaf powder amount.(3)The two types of C.Camphora leaf powder could significantly improve the soil fertility,available potassium,available phosphorus,available nitrogen and organic matter content.(4)The results of correlation analysis showed that there was a significant negative correlation between the soil available potassium content and the weed germination and growth.[Conclusion]The results showed that both C.Camphora oily leaf powder and deoiled leaf powder could inhibit the germination and growth of farmland weeds in the garden soil seed bank,and the effects of deoiled leaf powder was more obvious when the addition amount was less than or equal to 6%,When the addition amount was higher or equal to 9%,the effects of oily leaf powder on weed inhibition was more better.
万方数据
维普
