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Distribution Pattern of Inorganic Nitrogen Following Anhydrous Ammonia Injection into a Vertisol¹

ABSTRACT

Distribution patterns of inorganic forms of N and diffusion coefficients of NH₄⁺ were studied after injection of 800 mg of anhydrous NH₃-N per dish, each dish containing 1 kg of soil (Vertisol, bulk density 1.20 g/cm³) maintained at 1/3-bar moisture percentage and incubated for 120 days. Bell-shaped distribution patterns of NH₄⁺ and undissociated NH₃(aq) were observed. Diffusion coefficients of NH₄⁺ decreased with incubation time. During a 15-day incubation period, diffusion coefficients of NH₄⁺ increased with increase in moisture content up to 36% (cm³/cm³), but decreased with further increase in moisture content. A temporary accumulation of NO₂^--N was noticed up to 30 days of incubation at the periphery, but eventually NO₂^--N was observed near the injection point through 90 days. Production of NO₃^--N was first observed at the periphery followed by virtually even distribution throughout the retention zone.

¹ Contribution from the Dep. of Agric. Chem. and Soil Sci., Mahatma Phule Krishi Vidyapeeth (Agric. Univ.), Rahuri, M. S., India.

² Graduate Student and Associate Professor of Agric. Chem. respectively.

Received for publication October 29, 1976. Accepted for publication July 18, 1977.

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