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Title of Thesis

Muhammad Riaz
Institute/University/Department Details
University Of Arid Agriculture/ Faculty Of Crop & Food Sciences
Number of Pages
Keywords (Extracted from title, table of contents and abstract of thesis)
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)

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.

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2359.23 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
214.68 KB
2 1 Introduction 3
60.52 KB
3 2 Review Of Literature 9
357.73 KB
  2.1 Existing Cropping Patterns In Pothowar Plateau 9
  2.3 Weed Dynamics In Pothowar Plateau 12
  2.4 Weed Management Practices In Cereals 20
  2.5 Weed Management In Legumes 38
4 3 Materials And Methods 44
151.97 KB
  3.1 Site Description 44
  3.2 Description Of Experiments 47
  3.3 Cropping Pattern 50
  3.4 Data Collection 51
  3.5 Soil Analysis 52
5 4 Results And Discussion 63
1449.46 KB
  4.1 Weed Density (M -2 ) 63
  4.2 Weed Fresh Biomass 98
  4.3 Weed Dry Biomass 117
  4.4 Weed Mortality Percentage 137
  4.5 Wheat Yield And Yield Components As Affected By Different Cropping Patterns And Weed Control Methods 157
6 5 Sumary 210
40.77 KB
7 6 Literature Cited 215
284.17 KB
8 7 Appendices 254
116.32 KB