Vol. 17 No. 2
Weed floristic diversity in maize-garlic organic crop production system under mid-hill conditions of Himachal Pradesh
Author(s): R. SHARMA, G. D. SHARMA, S. S. RANA, N. KUMAR AND S. KUMARI
Abstract: The research was carried out in a continuing experiment under AICRP-WM (All India Coordinated Research Project on Weed Management) during mid-October, 2017 to third week of September, 2018 at Palampur. The previous year’s data were also included to have an insight on shifts in weed flora owing to organic weed management practices. There were 22 weed species in garlic and 19 weed species in maize. Phalaris minor, Daucus carota and Anagallis arvensis were the major weeds constituting 17.0, 14.0 and 12.0 per cent, respectively of the total weed flora in garlic. Commelina benghalensis, Galinsoga parviflora and Ageratum sp. were the major weeds constituting 21.0, 17.0 and 11.0 per cent, respectively of the total weed flora in maize. In garlic, lowest population of grasses was recorded in stale seed bed + mulch being statistically at par with raised stale seed bed + mulch and mulch. Whereas broad-leaved weeds population was lowest in stale seed bed + hoeing being statistically at par with raised stale seed bed + hoeing and hoeing. In maize, population of grasses and sedges was not affected significantly by various weed control treatments. Whereas population of sedges was minimum in raised stale seed bed + hoeing being statistically at par with mulch, intensive cropping, stale seed bed + mulch and intercropping. In garlic, Phalaris minor had greater importance in RSSB + hoeing, intercropping and chemical check treatments. Anagallis arvensis was most important in mulch and SSB + mulch treatments. Coronopus didymus was present in largest amount and was important in crop rotation. Lolium temulentum had highest important value index (IVI) in intensive cropping treatment. Digitaria sanguinalis had highest IVI in SSB + hoeing treatment. Whereas Polygonum alatum was having highest IVI in RSSB + mulch. In maize Commelina benghalensis was having more IVI in hoeing, SSB + hoeing, mulch, RSSB + mulch, crop rotation, intensive cropping and chemical check treatments. However, Galinsoga parviflora was present in large number with more IVI in RSSB + hoeing, SSB + mulch and intercropping treatments.
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