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A Method for Application of Nitrogen-15-Labeled Anhydrous Ammonia to Small Plots¹

ABSTRACT

A method is described that permits precise application of anhydrous ammonia in bands to plots of the size often used in ¹⁵N-tracer studies. This method involves placing a stainless-steel capillary tube in the soil where the ammonia is to be banded, attaching this tube to a cylinder of ammonia, and then pulling the tube through the soil with deposition of ammonia as an even band. The procedure has marked advantages over previously described methods because it can be used with mixtures of anhydrous ammonia and nitrificaton inhibitors and because the soil environment at the point of application is representative of the soil environment found when a conventional applicator is used.

¹ Journal Paper no. J-11994 of the Iowa Agric. & Home Econ. Exp. Stn., Ames. Project 2432. This work was supported in part by a grant from Dow Chemical USA.

² Predoctoral Research Assistant and Associate Professor, respectively, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011. Senior author is currently Assistant professor at Everglades Research and Education Center, Belle Glade, FL 33430.

Received for publication August 26, 1985.