Complete the gathering quest for forest and hills from the guild. When you enter Zone 1, go down the hill and turn to your right so that the cliff type landscape is on your right side. Then go forward towards the water to find a pile of dung sitting on the ground in the corner. Go over to it and press Circle to get either dung, monster droppings, or a Kut-Ku scale. Use the dung and monster droppings to fertilize your field.