In a greenhouse test NH was applied to a sandy loam soil infested with Tylenchorhynchus claytoni Steiner, 1937, Helicotylenchus dihystera (Cobb) Sher, Pratylenchus brachyurus (Godfrey) Goodey and Hoplolaimus galeatus (Cobb) Sher at rates of 0, 7.8, 15.6, 31.2, 62.5, and 125.0 mg N/500 gm soil. NH applications reduced soil populations of T. claytoni and H. dihystera at the three highest rates. Numbers of P. brachyurus in Ransom soybean roots were not reduced by any NH treatment. Root populations of H. dihystera and H. galeatus were reduced only with the 125 mg rate. Two field experiments demonstrated that planting-time applications of anhydrous ammonia at rates ranging from 0-224 kg N/ha were relatively ineffective in reducing late season larval numbers of Meloidogyne arenaria (Neal) Chitwood although significant yield increases were obtained in response to the treatments in one experiment. Results from a third field experiment demonstrated that at plant applications of anhydrous ammo
