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- Title
Weed Shift Analysis : A Way for Effective Weed Management.
- Authors
DHANAPAL, G. N.; NAGARJUN, P.; BAI, S. KAMALA; SINDHU, K. K.
- Abstract
Weed shift is the change in the composition and relative frequencies of weeds in a weed population. Weed shift occurs when weed management practices do not control an entire weed community or population. The management practices could be use of herbicide and other practices such as tillage practices, manure application, cropping system, harvest schedule and recently the climate change issues that bring about a change in weed species composition. Some weed species which are susceptible are killed by weed management practices, where as tolerant weeds are not affected by the management practices and still there exists another category which do not encounter the management practices. Those species that are not controlled can grow, reproduce and increase in their population resulting in weed shift. In case of chemical weed control, no single herbicide controls all weeds, the weeds which are not controlled by use of same herbicide over period of time are tolerant weeds / resistant weed which thrive and proliferate in the system resulting in gradual shift to tolerant weeds species. While the weeds which are susceptible to the particular herbicide, are gradually eliminated with continuous use of same herbicide. Weed shift does not necessarily have to be shift in the different species, there could be shift with in a weed species to late emerging weed species that emerge after application of herbicide. Weed shift and resistance can be effectively reduced by adopting weed management principles. Frequent monitoring is much required. It helps to know the reasons or the way for entry of new weed species and its effects to the crops and also helps to know the fault in management measures. It provides a better way to find out the best weed management measures for effective control of weeds without entry of any new species with higher yield and economic returns.
- Subjects
WEED control; WEED populations; TILLAGE; CROPPING systems; VEGETATION &; climate; CLIMATE change
- Publication
Mysore Journal of Agricultural Sciences, 2019, Vol 53, Issue 3, p1
- ISSN
0047-8539
- Publication type
Article