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Tillage and Weed Management Effects on Weed Density and its Biomass

Qaiser Maqsood, Rana Nadeem Abbas, Abdul Khaliq, Zahir Ahmad Zahir

Abstract


Weeds are biological constraint to the yield of crops. A field trial was conducted in Agronomy farm, University of Agriculture Faisalabad during 2013 and 2014 to evaluate impact of different weed management strategies on weeds density, fresh and dry biomass. Weed density, fresh and dry biomass showed variable response to different tillage systems (cultivator, rotavator, moldboard plough (MB) and chisel plough) and weed management techniques (Atrazine 330 EC @ 1.00 kg a.i. ha-1 at 20 DAS (days after sowing); hand weeding at 20 and 40 DAS; no weeding). Seven weed species Trianthema portulacastrum, Digera muricata, Echinochloa colona, Sorghum halepense, Cynodon dactylon, Echinochloa crus-galli and Eleusine indica were found in weed flora. Deep ploughing using MB plough in combination with hand hoeing at 20 and 40 DAS gave promising results (10 weeds m-2) in terms of weed control compared with no weeding (275 weeds m-2). Hand weeding and atrazine spray showed significant results in decreasing weed density of both broad-leaved and narrow-leaved weeds by 89-96% when recorded at 35 DAS and at harvest. Hand weeding was more than thrice as effective as atrazine spray. At harvest, density of narrow-leaved weeds was greater (63%) as compared with broad-leaved weeds (37%). Fresh weight (45 g m-2) and dry weight (5.14 g m-2) of weeds was also significantly restricted by hand weeding at 20 and 40 DAS. MB plough in combination with hand weeding and atrazine spray performed better in controlling weed density and producing significantly less fresh and dry biomass.


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