What is an Herbicide?An herbicide is a chemical mixture or substance used to control undesirable vegetation, especially weeds typically known as grasses. Herbicides are extensively used in gardening and in plantations, farming, and landscape turf management.
Herbicides are classified into two categories:read the full list of the botanical names of weeds here
Selective and non-selective. Selective herbicides kill specific unwanted plants while leaving desirable vegetation relatively unharmed. Non-selective herbicides (total weed killers) kill all or most plant species.
An herbicide can be applied directly to the plant, applied to the soil, or sprayed onto the foliage.
Herbicides are applied before, during, or after crop planting in row-crop farming to maximize crop production by diminishing the development of unwanted plants. Herbicides are also applied in ponds and lakes to control aquatic plants, in forests to prepare logged areas for replanting, and to golf courses, lawns, parks, and other areas to clear out unwanted vegetation.
Besides selective and non-selective classifications, a herbicide can also be categorized according to three other characteristics:
Persistence - How long the herbicide remains potent
Mechanism of action - How it works
Means of uptake - How the plants will absorb it (e.g., through the roots, above ground foliage, etc.)
A herbicide’s effectiveness is strongly influenced by its toxic mode of action and the application method.
Herbicides can as well act by inhibiting a plant’s amino acid production, growth, photosynthesis, cell division, or by mimicking natural Auxin hormones to cause deformities. Most modern herbicides are synthetic mimics of a natural plant’s hormones that obstruct the target plant’s growth.
Some plants such as the walnuts produces its own natural herbicide. Organic herbicides are useful and are commonly used in organic gardens, but they are less effective and more costly than synthetic herbicides because they based on natural materials. For effective result in the use of herbicide, I suggest you going to the dealers and there they will explain to you the differences between the various types of herbicides. There are, for record sake there are herbicide for weeds sprayed directly on the weeds without discriminating between crops and weeds that does not affect the crops. Some of these herbicide can systematically kill up to root and germinating seeds. Some wither the same day of spraying of the herbicide, the weeds will begin to wither.
And the application of herbicide is usually done early in the morning at least within three hours before rainfall
In some extreme cases, a combination of several herbicides is recommended when dealing with herbicide resistance. For more information on the various type of weeds or herbs read here
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HERE YOU WILL FIND EVERY AVAILABLE TOPICS ABOUT AGRICULTURAL SCIENCE AND BIOLOGY. AND THE LINKS TO THEIR VARIOUS SOURCES.
1. DEVELOPMENT OF AGRICULTURE
2. IMPORTANCE OF AGRICULTURE
3. SUBSISTENCE AGRICULTURE
4. COMMERCIAL AGRICULTURE
5. PROBLEM OF AGRICULTURAL DEVELOPMENT
6. SOLUTIONS TO POOR AGRICULTURAL DEVELOPMENT
7. AGRICULTURAL LAWS AND REFORMS
8. ROLES OF GOVERNMENT IN AGRICULTURAL DEVELOPMENT
9. AGRICULTURAL POLICIES
10. PROGRAM PLANNING IN AGRICULTURE
35. WILDLIFE CONSERVATION
36. FACTORS AFFECTING LAND AVAILABILITY
39. BIOLOGICAL FACTORS
40. SOCIAL-ECONOMIC FACTORS
41. ENVIRONMENTAL FACTORS AFFECTING AGRICULTURAL PRODUCTION
42. CLIMATIC FACTORS AFFECTING AGRICULTURAL PRODUCTION
73. BIOLOGICAL WEATHERING
74. CHEMICAL AND BIOLOGICAL COMPOSITION OF THE SOIL
75. SOIL WATER
76. MICRO AND MACRO NUTRIENTS
77. SOIL MICRO ORGANISM
78. PROPERTIES OF SOIL
79. SOIL STRUCTURE
80. SANDY SOIL
81. CLAY SOIL
82. LOAMY SOIL
83. SOIL TEXTURE
84. IDENTIFICATION OF SOIL TYPES THROUGH EXPERIMENTS
85. RETENTION OF WATER BY VARIOUS SOIL TYPES