The main's solutions don't take into account the lack of technology. Sure its easy to clean manure if you have concrete pads and tractors. The best they could do with what they have is pasture rotation to let manure dry and parasites die off. Even then they would probably have open grazing...
This would have flowed a bit better had the information about elf kidnappings come up when the main noticed the loli yelling for help on the other boat. Satisfying all the same.
Its been 8 pages or so and this guy is already one of the manga greats. Id have chosen a male body but I cant fault the guy when he's living his dream.