L-blade rotavators are the most common type of tiller blade in India. They're a good choice for many farm jobs. Here's when they work best.

Gives a fine, even soil texture that helps seeds germinate well.
Ideal after ploughing, when you just need to level and refine the field.
Cuts and mixes stubble, weeds, and organic matter into the soil.
Great for breaking up soil before sowing wheat, gram, maize, or vegetables.
Works smoothly in sandy, loamy, and black cotton soils that aren't too hard.

Why Farmers Like L-Blade Rotavators

L-shaped rotavators save time by combining several passes into one.
Sharp L-shaped edge cuts cleanly and pulverises soil well.
Gives good depth control, usually 4 to 6 inches.
Easy to find and replace blades at local shops.

When NOT to Use L-Blade Rotavators

Don't use them on very hard or compacted soil as blades may bend or wear out quickly. 
Avoid their usage on stony fields. Stones can damage the blades.
Wet, sticky clay clogs easily and the finish becomes poor.

Always match the rotavator to your tractor's horsepower, and check blades regularly for wear to keep results good.