Riaz, Muhammad (2005) WEED MANAGEMENT IN WHEAT BASED CROPPING PATTERNS UNDER RAINFED CONDITIONS. PhD thesis, University of Arid Agriculture, Rawalpindi.
The investigations which include two field experiments were carried out at National Agricultural Research Centre (NARC), Islamabad, Pakistan during 2003-2004. In both of investigations, different weed control methods (chemical, mechanical, hand weeding and their integration) under various cropping patterns (wheat-fallow-wheat; wheat-com-wheat; wheat-legume-wheat) were compared for their efficiency to control thirteen weed species, i.e., Fumaria indica L. (Fumatory), Euphorbia helioscopia L., Melilotns indica L., Chenopodium album L. (Lamb's quarters), Medicago polymorpha L. (Wild medic), Avena futua L. (Wild oat), Convolvulns arvensis L. (Field bind weed), Trianthema monogymna L., Cuprus rotundus L., Sorghun helepense L. (Pers), Digera avensis L., Echinochloa colona L. (Link) and Cynodon dctylon L. (Pers) during both the study years. The effect of these weed control measures on yield and yield components of wheat (Triticum aestivum (L) Corn (Zea mays L.), Mungbean (Vigna radiata) and cowpeas (Vigna unguiculata) was assessed. Different weed control methods suppressed significantly weed population, fresh and dry matter and increased mortality percentage of weeds under study. Among different weed control techniques, integrated weeding, i.e., chemical weeding at 2-3 leaf stage of weeds with a fallow-up hand weeding after 50 days of crop sowing (WC6) gave promising results closely followed by Mechanical weeding after 20 days of crop sowing with a follow-up hand weeding after 50 days of crop sowing (WC5) and/or two hand weedings after 20 and 40 days of crop sowing (WC2). Maximum weed mortality percentage was noted with these treatments. These weed control methods out yielded the yield and yield components of crops under study during both the study years (2003-2004). The economic analysis of these weed control techniques showed again better performance of WC6 (Chemical weeding at 2-3 leaf stage of weeds + Hand Weeding at 50 DAS) as compared to rest of the treatments under all cropping patterns during the study period (2003-2004). Maximum percentage value of harvest index was calculated with WC6 for all cropping patterns. A significant positive interaction between cropping patterns and weed control methods was observed during both of the years.
|Item Type:||Thesis (PhD)|
|Uncontrolled Keywords:||weed management, cropping patterns, weed density, weed fresh biomass, weed dry biomass,weed mortality percentage, wheat yield, wheat, wheat-fallow-wheat, wheat-com-wheat, wheat-legume-wheat, fumaria indica l. (fumatory), euphorbia helioscopia l., melilotns indica l., chenopodium album l. (lamb's quarters), medicago polymorpha l. (wild medic), avena futua l. (wild oat), convolvulns arvensis l. (field bind weed), trianthema monogymna l., cuprus rotundus l., sorghun helepense l. (pers), digera avensis l., echinochloa colona l. (link), cynodon dctylon l. (pers)|
|Subjects:||Agriculture & Veterinary Sciences(a) > Agriculture(a1)|
|Deposited By:||Mr. Muhammad Asif|
|Deposited On:||07 Aug 2006|
|Last Modified:||04 Oct 2007 21:01|
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