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Responses to defoliation and fertiliser,corm development and chemical control of onion grass(Romulea rosea)in the Mediterranean environment of southern Australia

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Grassland Research 2022年第3期1卷 197-206页

作者： Zhongnan Nie Reto Zollinger ralph behrendt Department of Jobs Precincts and RegionsHamiltonVictoriaAustralia College of Grassland ScienceGansu Agricultural UniversityLanzhouGansu ProvinceChina

Background:Onion grass(Romulea rosea)is a common weed that infests native and improved pastures in the Mediterranean environments of southern *** is a very challenging weed to control due to its distinctive growth and survival mechanisms involving ***:Three glasshouse experiments were conducted in Australia to investigate the response of onion grass to defoliation and fertiliser application,the development and growth of onion grass corms and the chemical control of the weed in winter and ***:Defoliating consistently to 1 cm above ground reduced corm weight by 84%compared with the *** or high fertiliser application did not increase herbage mass of onion grass compared with the nonfertilised *** corm weight of onion grass declined from Weeks 1 to 8 after emergence,remained at 53-60 mg dry matter(DM)corm−1 from Weeks 8 to 19 and then declined on average to 37mgDMcorm−1 up to Week 26 after *** corms started to develop at Week 6 after emergence.A small proportion of the onion grass plants(7.5%)developed multiple new corms(3-6 corms)from a single old *** most effective herbicide control was a winter application of metsulfuron methyl or imazamox as an alternative product to protect ***:This study has identified the growth and development patterns of onion grass corms,how the plant responded to defoliation and fertiliser application and effective chemical control of this *** findings have significant practical implications for the improvement of onion grass-infested pastures.

关键词： corm development herbicide plant density seedpod number timing of chemical control

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