- The average grain price of Dry Grain Harvest (GKP) quality at the farm level rose 3.36 percent, from Rp 5,004.32 per kg in May 2019 to Rp 5,172.27 per kg in June 2019. Likewise the price of grain in the rate of grinding rose 3.34 percent from Rp 5,090.61 per kg in May 2019 to Rp 5,260.54 per kg in June 2019.