National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Weeds are ubiquitous in nature and invade both crop and non-crop lands. When present in crop fields, weeds compete with the crops for nutrients, soil moisture, solar radiation and space; hence reduce their productivity and quality. But, they have been the most underrated crop pests despite the fact that these are weeds which cause heavy loss in crop yield rather than other pests. It has been reported that, out of total loss of agriculture production from several pests in India, weed account for about 37%, insect for 29%, diseases for 22% and other pests for 12%. Under changing climate scenario, the levels of weed menace and consequent crop-weed competition are expected to change. Weeds have been conquers and will remain dominant in climate change conditions also since, they have vast adaptive capacity and greater diversity. Climate change may aggravate the weed density, their phenology and invasiveness. Elevated CO2, rising temperature, changing in rainfall pattern are the distinct consequences of climate change, which leads to deleterious changes in the crop-weed competition, photosynthetic pathway and ultimately growth, density and expansion of weeds. Under climate change scenario, plants with C4 photosynthetic pathways are expected to benefit more than C3 from rising temperature but inverse is true with CO2 enrichment. This differential response of C3 and C4 plants to elevated CO2 and temperature can have important implications on crop-weed competition as most of the weeds are C4 and most of the crops are C3 plants.
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