Distribution Pattern of Inorganic Nitrogen Following Anhydrous Ammonia Injection into a Vertisol1
- S. T. Khengre and
- N. K. Savant2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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