Have authority to contract with persons growing row crops on land adjacent to township or district roads to buy standing strips of such crops to remain in place to act as snow breaks along such roads in those places where experience shows that drifting snow has been an obstruction to traffic. The contract price to be paid by the highway commissioner in any such case shall be the higher of the market price in the local area of such crop at the time of contracting or the current Commodity Credit Corporation target price. An additional sum of money equal to 10% of the contract price may be paid to the grower as an inconvenience fee.