Year : 2011, Volume : 43, Issue : 1and2
First page : ( 1) Last page : ( 11)
Print ISSN : 0253-8040. Online ISSN : 0974-8164. Published online : 2011  01.

Impact of Climate and Carbon Dioxide Change on Weeds and their Management-A Review

Singh R. P.¹, Singh Ramesh K.¹, Singh M. K.¹

¹Department of Agronomy, Institute of Agricultural SciencesBanaras Hindu University, Varanasi-221 005 (U. P.), India

Abstract

Climate change directly affects the geographic range of species, the timing of species life cycle (phenology), the population dynamics of species, the decline and extinction of some species and the invasion of other species. Plants with C₃ photo synthetic pathways are expected to benefit more than C₄from CO₂ enrichment. However, rising global temperature may give competitive advantage to C₄ plants than C₃. This differential response of C₃ and C₄ plants will alter crop weed interaction because of the fact that majority of weeds are C₄ and most of the food grain crops are C₃. Higher levels of carbon dioxide could stimulate the growth of some weed species and greater production of rhizomes and tubers in perennial weeds making them difficult to control. Warmer temperatures will accelerate the rate at which day degrees accumulate, so the life cycles of some plant species may accelerate. As a result weeds are likely to mature and start to decay earlier.

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Keywords

Global warming, Crop-weed competition, Life cycle, Weediness.

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