Biology of some winter season weeds: germination behaviour and seed bank dynamics
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Date
2005-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Biology of weeds include morphology of the plant, seed dormancy and germination, physiology of vegetative and reproductive growth, phenology and competitive ability. In the present study, germination and emergence of five winter season weed species of the tarai region viz., Vicia sativa, Vicia hirsuta, Phalaris minor, Rumex acetosella and Lathyrus aphaca was studied as well as the weed seed bank was estimated in long term herbicide trials and long term tillage trials. Effect of different concentrations of three chemicals, viz., KNO3, H2O2, thiourea and the growth regulator GA3 on germination was evaluated. All the chemicals and the growth regulator GA3 promoted germination of the weed species under study except Rumex acetosella at different concentrations. Emergence of weeds from different soil depths revealed maximum emergence of weed species from D1 depth (2 cm) and minimum from D4 depth (8 cm). A total of three monocot and seven dicot weed species were recorded in long term herbicide trials whereas Phalaris minor was the dominant species. A total of three monocot and seven dicot weed species were recorded in long term tillage trials and two monocot and six dicot weed species were identified in direct seeded rice trials. There were several unidentified species at each depth in all the trials. Depth distribution of weed seeds was uniform in direct seeded rice trials, whereas in the long term tillage trials, higher number of seeds was recorded in D1 depth in conventional tillage.
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