Agricultural pollution in Ohio

My research paper discussed the declining water quality of Lake Erie caused by agricultural pollution. I focused on the Maumee river basin which drains into the western end of the lake because for the past 15 to 20 years harmful algal blooms have been the worst in that area. Algal blooms feed off of the agricultural pollution which is mainly plant nutrients and thrive when these nutrients are supplied in excess. I found that although the amount of land devoted to agriculture in Ohio has decreased, the production of corn has largely increased. Corn requires more phosphorus than most other crops and as a result more phosphorus has been entering the ground water throughout Ohio that feeds Lake Erie. The rise in corn production correlates to the rise of harmful algal blooms in Lake Erie's western end. The agricultural land use change seems to be a main contributing factor to the decline of Ohio's water quality.
This topic was interesting to me because my family owns a lake house in Ohio on a lake that is experiencing the same algal blooms as lake Erie. The lake is also located in an area that is predominantly farm land. I was hoping to discover a solution that could also be applied to this lake. It seems that the only solution would be to reduce the amount of land devoted to agriculture but this seems to be impractical. I also would like to research what the purpose of all the corn that is grown in Ohio. Whether it is for human consumption, animal feed, or to be added to other products. I've learned in other courses that there is a surplus of corn in the US and the majority of corn grown is not for human consumption. If the production of corn was decreased the amount of phosphorus that enters the ground water would also decrease. This is a complex issue because the majority of farmers rely on corn production to make a living. It also would be interesting to see if another crop could take the place of corn if this would help the problem.