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SRI-Rice, Dept. of Global Development, Cornell University, profile picture
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0896 Weeders for Use with SRI- Alternative Designs to Save Labor Time and Energy

SRI recommends planting rice in a square pattern to allow for mechanical weeders to be used in perpendicular directions. Mechanical weeders like rotary hoes and cono-weeders aerate the soil while turning weeds back into the soil to decompose. An engineer in Madagascar designed an adjustable two-row weeder based on drawings from IRRI. A new weeder design developed in Sri Lanka greatly reduces weeding time from 5-10 days per acre to 1-2 days per acre. This weeder has teeth similar to cono-weeders that do not get clogged like other hand weeders.

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Weeders for Use with SRI Alternative Designs to Save Labor Time and Energy
For Easier Weeding…. SRI recommends planting seedlings in a square pattern, so a mechanical hand weeder (rotary hoe or cono-weeder or some adaptation) can be used in two perpendicular directions. This process aerates the soil while turning weeds back into the soil to decompose.
The “Rotating Hoe” In Sri Lanka, this tool is called the “Japanese weeder.” In China, it is called the “wolf-fang weeder.”
 
Simple Cono-Weeder This tool has hollow ‘cones’ with ‘ tooth-bars’ that churn the soil and weeds. It moves more easily over the surface of the soil.
Double Cono-Weeder An engineer in Madagascar took IRRI’s drawings and made an adjustable two-row weeder.
New Weeder Design in Sri Lanka H. M. Premaratna has developed a new weeder design that greatly reduces the time needed to do a soil-aerating, weed-removing operations. This is being manufactured locally in Sri Lanka for less than $10 each .
 
Advantages of this weeder Premaratna’s weeder can reduces weeding time from 5-10 days/acre to 1-2 days/acre, farmers say. The ‘teeth’ of the new weeder, similar to the cono-weeder used in South India, do not get clogged with mud that needs to be removed, because the weeder is always pushed forward -- not pushed and pulled, forward and backward, as must be done with many other hand weeders for removing weeds and aerating the soil
Rotary weeder used in India
Weeder being demonstrated in Cuba
 
Weeder being used in SRI demonstrations in Senegal
Four-Row Weeder Gopal Swaminathan in Kadiramangalam, Tamil Nadu, India, has designed and built a four-row weeder. It does not require more upper-body strength than a woman can provide.
Motorized Weeder Ariyatne Subasinghe, from Hingurakgoda, Sri Lanka, has designed and built a motorized weeder that enables him to weed/aerate 2 ha in one day.
Tamil Nadu Agricultural University demonstration of SRI weeding
Using cono weeder in Tamil Nadu
 
Simplest Weeder Design – Association Tefy Saina, Madagascar No moving parts -- two-person operation -- considered to be very thorough and quick
Cambodian weeder design costing > $3 to build
Simplest weeder -- made by farmer in Morang District, Nepal; costs only 25 cents 1 laborer can weed 1 are in the time that 2-3 laborers require for manual weeding
Positive thinking about Weeding in the Philippines – ‘Aerobic Weeding’
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