Show nitrogen nit en soil soil mae mae mac RN assistant Al let experiment station Stati peak peak speak soil soil account foot le suffice say say nay say nay sky say nay sky bay ta moat feed foot deep dot hold true prom analysis several alfalfa tractor found fret foot foot loot foot loot root soil hut tea depth sir sir six feet average word alfalfa land rich tn tea poor below foot land reverie deep alfalfa plant penetrate car car far wit wit mit soil search food plant ere top soil way bore lop lop top soil soil FT FT rot DEPTH SOIL ADD NITRATES plant penetrate far ground search necessary food less |