ABSTRACT

Anhydrous ammonia was a common nitrogen fertilizer in past decades. Producers have speculated the change in their standard anhydrous ammonia fertilizer applications may have facilitated the increase of the reniform nematode since anhydrous is known to kill the microbial populations in the soil in the localized region where it is injected. Twelve tests over three states have been conducted between 2000 and 2002. Anhydrous ammonia was compared to the fertilizer standards ammonium nitrate, N-sol, and urea plus ammonium nitrate at similar rates. Temik 15G, Telone II, and Vydate treatments were also included as standard nematicide comparisons. In only two of twelve tests, anhydrous significantly increase yield over the nitrogen standard. Over all tests, anhydrous ammonium increase lint yield 34.9 pounds over the nitrogen standard for an additional value of $ 7.45/acre. However, the commercial nematicide materials (Temik 15G, Telone II, and Vydate), increased lint yield an average of 101 pounds over the nitrogen standard for an additonal value of $31.88/acre.