10, 100, 500 and 1,000 mg kg−1 wet soil), which are simi- The aims of our study were therefore to: lar dose rates to the pure compounds of LA and LN used (a) determine the relative effect of LA, LN and DCD on “residual” NH +4 and NO −3 concentrations, (b) evaluate the effect of LA, LN and DCD on N2O and CO2 emissions TABLE 1 Properties of soils (0–10 cm) used in the incubation from soil, and (c) e. [...] In the LA, LN and DCD treatments, daily CO2 At the end of the 38 days of incubation, the amount emissions increased rapidly from d 1 to d 4, and then of 14C-labelled BNIs and DCD remaining in the soil were decreased gradually. [...] In LA 500 and LA 1,000 treatments were 1.1 mg C kg−1 dry the water-based extraction, only 2.1–2.6% of 14C-labelled soil h−1 and 1.6 mg C kg−1 dry soil h−1, and were 1.4 mg C LA and 2.7–2.8% of the 14C-labelled LN remained, com- kg−1 dry soil h−1 and 2.1 mg C kg−1 dry soil h−1 in the LN pared with 20.6–25.3% of the 14C-labelled DCD. [...] In the LA, LN and DCD treatments, 37.2–45.4%, In the LA 10 treatment, the cumulative CO2 emis- 30.9–55.9% and 64.5–73.2% of the 14C-labelled substrates sions were significantly (p < 0.01) lower, with a reduction were not recovered in the water and ethanol extractions, rate of 27.7% compared to the control. [...] LA and LN) and observed value (the observed amount of If the inhibition of soil nitrification occurred in the N immobilization) for the LA (Figure 5a, p < 0.001) and LA and LN treatments during the incubation, the soil LN treatments (Figure 5b, p < 0.01).
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- United Kingdom
