From your discussion I agree in that at peak time almost rice harvest will be vulnerable in attacking pests as well as other plant problems.

But do not worry @abudar I will help you in terms of keeping the sparrow by making a net of nylon thread

Maybe from one side already know such tricks but I think it is less effective if only stretching the nylon thread above the surface of the rice plant because of a sparrow type of birds as you mentioned earlier also will easily enter through the side of a net made of nylon yarn.
Is not the Bird expert in the church.

what I want to say in this case is that the mesh made of the nylon benz must meet the criteria.
that is, the nolon yarn web must be spaced one inch from the surface of the rice or about 8.cm.
The nylon thread web must be able to move freely if blown by the wind of the net can move like wavy

as a help please make a nylon thread net as a trapper by installing the net as if you are installing a NET Vollyball net but having to tread the threads that the birds can see.
the net you sew the pocket you sew must be free and easy swing swing.

In this way Sparrow and other bird pests can be spared from the attack.
yaaa ... at least we also get the catch of birds to add additional menu daily meal with the trick.
good luck greeting @adikuala.