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Nitrogen transformations occurring in an acid loamy sand fertilized with urea were determined during incubation in the laboratory for 12 days. Fertilizer treatments included prilled urea (600µgNg−1 soil) ± nitrapyrin or potassium chlorate, and prilled urea (1200µgNg−1 soil). Unfertilized soil and soil amended with KNO3 solution were included as controls.(More)
Nitrous oxide emission from three soils was measured using a chamber technique. Treatments sampled were unfertilized soil, and soil fertilized with 60 or 80 kg N ha−1 of band-applied anhydrous ammonia ± nitrapyrin. The flux of nitrous oxide from unfertilized soil was very low (1.1 to 1.6 g N ha−1 day−1). Application of anhydrous ammonia caused a significant(More)
Three 15N labelling strategies for estimating below-ground N in Sesbania rostrata grown in pots under flooded conditions were examined. The estimated proportions of total plant N resident below-ground were 13% (stem injection), 42% (leaf immersion) and 56% (adventitious root feeding). The average estimate based on leaf and root immersion (49%) was(More)
BACKGROUND Patients with severe asthma appear relatively corticosteroid resistant. Corticosteroid responsiveness is closely related to the degree of eosinophilic airway inflammation. The extent to which eosinophilic airway inflammation in severe asthma responds to treatment with systemic corticosteroids is not clear. OBJECTIVE To relate the physiological(More)
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