In one of the few places in Colorado where the mountains aren't visible on the horizon, the effects of low snowpack in the peaks are still very much felt.Lifelong farmers in the lower Arkansas River Valley say what happens in the mountains will show up in their fields, when fewer seeds go into the ground.Brian Knapp owns his family farm and market just west of Rocky Ford. He said he's no stranger to drought seasons."I remember one year, in the m…