DEPARTMENT OF AGRONOMY
Patuakhali Science and
Credit hour: 21
SYLLABUS OF B. Sc. Ag.(Hons.) Courses
Course code: AGR 224
Course Title: Weed Science
Credit hour: 2+1
Offering semester : Winter/Autumn
Batch of Student entitled: L2-4th
WEEDS: Definition, characteristics and classification of weed. Harmful and beneficial effects of weeds. Biology and ecology of weeds.
PROPAGATION AND PERSISTENCE: Propagation, dispersal and persistence of weeds.
CROP WEED COMPETITION: Crop-weed competition for light, space, moisture and nutrients. Critical period of crop-weed competition. Allopathic effects of weeds on crops.
WEED MANAGEMENT: Principles, prevention, eradication and control of weed. Mechanical, cultural, chemical and biological methods of weed control. Integrated weed management: concept, principles, importance. Integration of herbicides application with other methods.
HERBICIDE: Definition. Objectives and scope of herbicide application. Classification. Methods of herbicide application. Herbicide application equipment and its calibration. Formulation. Mechanism of action of herbicides. Herbicide selectivity. Adjuvant. Herbicide recommendation based on crops and cropping system. Interaction with moisture, fertilizer, bio-fertilizer, insecticides and fungicides. Fate of herbicides in soil. Toxic symptoms of herbicide in weeds and crops. Effects of herbicide on environment.
1. Identification weeds and weed seeds.
2. Preparation of a weed herbarium.
3. Study of the life cycle and morphology of some common weeds of
4. Practicing cultural methods of weed control.
5. Working out the efficiency of different implements used for mechanical method of weed controls.
6. Identification of herbicides and different formulations.
7. Use of herbicide application equipment and calibration of a sprayer.
8. Working out herbicide requirement for different crops.
9. Designing integrated weed management for important crops.
10. Working out economics of different weed control methods.
11. Spraying of herbicides in crop field to study their effect on crops and weeds.
12. Precautionary measures to be taken for herbicide application.
Books and Periodicals Recommended
1. Grafts, A. S. and Robbins, W. W. 1973. Weed Control. Tata-McGraw- Hill Publishing Co. Ltd.
2.Gupta, O. P. 1984. Scientific Weed Management. 2nd Revised & Enlarged edn. Today & Tomorrow’s Printers & Publishers.
3.Gupta, O. P. and Lamba, P. S. 1978. Modern Weed Science. Today and Tomorrow’s Printers and Publishers.
4.Rao, V. S. 1988. Principles of Weed Science. 3rd edn.
5.Subramanian, S; Mohamed Ali, A. and Joya Kumar, R. 1997. All About Weed Control.
6.Zimdahl, R. L. 1983. Fundamentals of Weed Science. Academic
1.Aldrich, R. J. 1984. Weed-crop ecology- principles in Weed Management. Breton Publishers,
2.Fryer, J. D. and Makepeace. 1978. Weed Control Handbook Vol. II. Blackwell Scientific publication.
3.Hance, R. J. and Holy, K. 1990. Weed Control Handbook: Principles (8th edition), Blackwell Scientific publication,
4.Narwal, S. S. 1994. Allelopathy in Crop Production. Scientific Publishers, 5 A, New