Prepping rice field for fill

Greetings All,

Looking for consul. Ground preperation for fill.

1 rai rice field, about 1.2 meters fill. Central thailand clay.

Would like small house with garden and fruit trees.

I remember reading about spreading a product before filling - helping to condition the fill???

After fill, plow rice "hull" into surface. ?.?

Planting "Ruzi" "cow grass" ? on side slope to help with erosion.

Thanks for your response.