ONAWA, Iowa (AP) – Landowners in Monona County are complaining about a big increase in their property taxes.  The Sioux City Journal reports the landowners gathered Tuesday at the county courthouse to discuss what they could do about the tax increase and to question county assessor Tim Peters and county board members.  Castana farmer William Brink says his taxes have increased by $9,000 in one year. Officials say the change is because of a new way counties value land based on the ability to produce crops. If soil is more fertile, it’s taxed at a higher rate.  The new system also applies to more land, causing increases on property once overlooked.  Some counties adjust taxes for property not used for row crops, but Monona County is among 50 counties that doesn’t make adjustments.