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24
Jun

Herbicide classification

 

1. Anilides: Eg. Butachlor, Pretilachlor, Propanil

2. Bypyridyliuns: Eg. Paraquat

3. Dinitro anilines:  Eg. Butralin, Pendimethalin.

4. Organophosphorus compounds: Eg. Glyphosate.

5. Phenoxyacetic acids Eg. 2,4,D, Fenoprop, MCPA, 2.4.5.T

6. Thiocarbamates Eg. Molivate, Thiobencarb

7. Triazimes Eg.  Simetryn, Dimethametryn

8. Sulfonylureas Eg. Bensulfuron

9. Polyclic alkalnoic acids Eg. Fenoxaprop

10. Miscellaneous he

24
Jun

Chemical weed control

 

1. Among all methods, chemical control is effective and herbicides being cheap, reliable, have facilitated a revolution in crop agronomy. Currently, herbicides share about two-third by volume of the pesticides used in agricultural production. 

2. Globally herbicides constitute about 50-70% of total pesticides sale in USA and European countries like Germany, France and Austria.

24
Jun

Mechanical weeders for weed control

 

1. The  use of hand operated or power operated weeders is feasible only where rice is planted in straight rows. 

 2. Hand weeders such as rotary and cono weeders are not effective if land is too dry or in standing water. 

3. The pushed weeders are in common use. The weeder should be run in both the directions, at right angles to each other.  

 

24
Jun

Digging method of weed control

 

EIS,Weed Management
24
Jun

Cutting method of weed control

1. Weeds are cut above the ground surface with sickle.

2. Dredging and chaining of weeds along with their roots and rhizomes by using heavy chains.

3. The weed infested field is ploughed deeply and flooded with water for 2 - 4 weeks up to a depth of 30cm and water level has to be maintained constantly.

 4. Flooding is  effective method in case of perennial weed, like Cyperus rotundas, Cynodon dactylon.