Tiêu đề AGRO-3510_compressed.pdf ✅

Lecture No. Topic to be covered Weightage 1 Weeds - introduction, harmful and beneficial effects of weeds. 4 2 and 3 Propogation and dissemination 8 4 and 5 Weed biology and ecology, crop weed association 6 6 Crop weed competition and allelopathy, Factors affecting crop weed competition. 10 7 Concept of weed prevention, control and eradication 8 8 and 9 Weed control methods- Physical(mechanical)- Cultural-Chemical and Biological methods. 8 - Mid term examination 10 Chemical method of weed control in field and horticultural crops 6 11 Integrated weed management in important field crops. 6 12 Herbicides, advantages and disadvantages and limitations in herbicide usage in India 6 13 Classification of herbicides, their properties and formulation 8 14 Methods of herbicide application 6 15 Absorption and translocation of herbicides and factors affecting it. 6 16 Introduction to selectivity, mode of action and persistence of herbicides, Introduction to adjuvants. 8 17 Compatibility of herbicides with other agrochemicals and shift of weed flora in cropping systems, Control of aquatic, parasitic and problematic weeds 10

Harmful effects of weeds Of the total annual loss of agricultural produce from various pests in India, weeds account for 45%, insects 30%, diseases 20% & others 5%. The losses due to weeds depends on 1. Type of weed 2. Severity of Infestation 3. Duration of infestation 4. Competitive ability of the crop plants with weeds 5. Climatic conditions which effect the growth of the crop and the weed The fallowing are the harmful effects of weeds on various activities of human beings, crops, livestock and related aspects. 1. Weed menace in agriculture 2. Weed menace in animal husbandry 3. Weed menace to human health 4. Weed menace to aquatic ecosystems 5. Weed menace to forest and pasture land 6. Weeds as alternate hosts to crop pests and diseases 7. Weeds reduce land value. 8. Weeds limits choice of crops Weed menace in agriculture: Reduction of crop yield has a direct correlation with weed competition. Weeds compete for water, light, nutrients and space. Weeds compete for water in dry land and for nutrients in