The Plant Board may issue and enforce a stop-sale order on any fertilizer found subject to a penalty under the Fertilizer rules, or when said fertilizer is consistently found deficient from the guaranteed claims to any appreciable extent. Fertilizers so stop-saled shall be released when the same are labeled by the manufacturer or his agent to reflect the true contents, or when the shipment is to be returned to the manufacturer for reprocessing. All costs and expenses incurred by the Plant Board in such withdrawals shall be paid by the manufacturer to the Plant Board within 15 days after release is given.