cassava farming land preparation 

You can plant but you will be dealing with unwanted plant (weed) every month.

@@FarmerAkinloye thanks Boss Please it's advisable to plant cassava and add maize to it.. And with your experience how can I do such thing please?

Yes.. plant cassava when maize is 2-3 weeks old.

Please for us that has large land which chemical do you suggest we use after planting our cassava to avoid weeds

If you check my maize and cassava playlist you will get insight on how to deal with weed. Star force and potasun is a selective systemic herbicide to control weed in a cassava farm, the condition is; 1. the unwanted plant most be Grass and Three weeks- 1 months old for the herbicide to be effective, if the age of the unwanted ( grass)plant pass 1 months before you spray the unwanted plant it may not die completely. 2. It will not kill all broad leaves inside the farm.