velocity -= <<0,abs(noise(position *0.09)*10),0>>;

this is maya mel for controlling particles fall.

how should I do, could make the same effect in houdini particles?

put down a vop pop and have a look at the nodes, you have all the building blocks you need there to rebuild that expression.

A few extra ones you might need are:
vectorToFloat
floatToVector.

Just as a simple example:
connect the global incoming velocity to the global outgoing velocity.
Now insert a multiply node inbetween. Create a parameter node and also link it in with the multiply. Go out of the vop pop, now you have a little slider control to multiply the velocity….

explore the other vop operators.

pclaes
put down a vop pop and have a look at the nodes, you have all the building blocks you need there to rebuild that expression.

You could also just use a velocity POP. Place into each field (substituting the appropriate $VX, $VY, or $VZ): $VY-abs(noise(vector3($TX,$TY,$TZ) * 0.09)*10)
Of course, the noise calculation will be different in Houdini than Maya, so the end result will inherently be different.

– Antoine

Can you show me an example?

I try to add a force in POPs, and got errors.