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Effect of allelopathic rice varieties combined with cultural management options on paddy field weeds

文献类型： 外文期刊

作者： Kong, Chui-Hua 1 ; Hu, Fei 2 ; Wang, Peng 1 ; Wu, Jing-Lun 3 ;

作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China

2.S China Agr Univ, Guangzhou 510642, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： Oryza sativa L.;allelopathy;cultural management;low-dose herbicide;weed suppression;paddy field

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

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收录情况： SCI

摘要： BACKGROUND:A number of techniques,including cultural management,allelopathy and bioherbicide,have been considered as alternatives for synthetic herbicides,but successful weed control will require the careful integration of these multiple techniques.This study was conducted to assess the use of allelopathic rice varieties in combination with cultural management options on paddy weeds,in order to develop an allelopathy-based technique to reduce herbicide use in paddies.RESULTS:The weed-suppressive effects of the rice varieties tested varied highly with allelopathic trait,planting pattern and cultural management including planting density,flooding depth and duration and supply of nitrogen.Allelopathic rice varieties PI312777 and Huagan-1 demonstrated much stronger weed suppression than the non-allelopathic variety Huajianxian under the same planting pattern and cultural management.Their weed-suppressive effect was increased with cultural management options.In particular,if integrated cultural management options of allelopathic rice varieties included a low-dose(bensulfuron-methyl,25 g AI ha~(-1),a third of the recommended dose)herbicide application,the emergence and growth of most weeds found in paddy fields was completely controlled.No grain yield reduction for allelopathic varieties occurred under integrated cultural management options,whereas with the non-allelopathic variety a reduction of up to 45-60% was measurable even with the low-dose herbicide application.CONCLUSION:The allelopathic potential of rice varieties will likely have a great impact on paddy weed control if integrated with cultural management options and application of low doses of herbicides.Therefore,it is feasible to reduce herbicide input in paddies if allelopathic rice is grown under integrated cultural management practices.

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