Category: Weed Management Notes

Weed Management Notes

Allelopathic Effect of Weeds on Crops
Allelopathic Effect of Weeds
Biological Methods of Weed Control
Chemical Methods of Weed Control
Classification of Herbicides
Classification of Weeds
Compatibility of Herbicides with Other Chemicals
Critical period of weed competition
Crop Weed Competition
Cultural Methods of Weed Control
Herbicides – Advantages and Limitation
Herbicides Available in India
Integrated Weed Management
Losses Caused by Weeds
Mechanical or physical methods of weed control
Methods of Herbicide Application
Methods of Weed Control
Persistence of weeds
Propagation and Dissemination of Weed Seeds
Weed Biology
Weed Ecology
Weed Management in Major Field Crops

Weed Biology

Weed Biology Weed biology is the study of the establishment, growth, reproduction, and life cycles of weed species and weed societies/vegetation. Weed biology is an integrated science with the aim of minimizing the negative effects, as well as using and developing the positive effects, of weeds. Based on life cycle weeds are classified as annuals, […]

Propagation and Dissemination of Weed Seeds

Propagation and Dissemination of Weed Seeds Propagation Propagation is the process of multiplying or increasing the number of plants of the same species and at the same time perpetuating their desirable characteristics. Plants may be propagated under two general categories: sexual and asexual propagation. Reproduction by seed Reproduction by seed is called sexual reproduction. It […]

Weed Ecology

Weed Ecology Weed ecology is the study of the interaction or relationship between a weed and its environment (other living organisms as well as abiotic factors). Ecology is concerned with growth characteristics and adaptations that enable weeds to survive the change in the environment. For effective weed control, the study on both biology and ecology […]

Persistence of weeds

Seed Dormancy Dormancy is a state of seeds and buds in which they are alive but not germinated. If all weed seeds were to germinate at one time, their seedlings could be destroyed. Dormancy allows storage of millions of weed seeds in soil and enables them to grow in flushes over years. Persistence of weeds […]

Methods of Herbicide Application

Methods of Herbicide Application 1. Spraying 2. Broadcasting Factors influencing the methods of application are a. Weed-crop situation b. Type of herbicides c. Mode of action and selectivity d. Environmental factors e. Cost and convenience of application Depending on the target site, the herbicides are classified in to a. Soil applied herbicides b. Foliage applied […]

Methods of Weed Control

Methods of Weed Control For designing any weed control programme in a given area, one must know the nature & habitat of the weeds in that area, how they react to environmental changes & how they respond to herbicides. Before selecting a method of weed control one, much have information on the number of viable […]

Losses Caused by Weeds

Losses Caused by Weeds A. Reduction in crop yield Weeds compete with crop plants for nutrients, soil moisture, space and sunlight. Depending on type of weed, intensity of infestation, period of infestation, the ability of crop to compete and climatic conditions the loss varies. Among the pests weeds account for 45 % reduction in yield […]

Herbicides Available in India

Herbicides Available in India Prior to the widespread use of chemical herbicides, mechanical control and cultural controls, such as altering soil pH, salinity, or fertility levels were used to control weeds. Many modern chemical herbicides for agriculture are specifically formulated to decompose within a short period after application. This is desirable as it allows crops […]