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Kinetics and Adsorption-Desorption Behavior of AM Nitrification Inhibitor in Mollisols

Author:
Rawat, K. S., Srivastava, A., Bhatt, S. C., Pachauri, S. P., Srivastava, P. C.
Source:
Communications in soil science and plant analysis 2017 v.48 no.8 pp. 857-864
ISSN:
1532-2416
Subject:
Mollisols, adsorption, clay fraction, desorption, electrical conductivity, leaching, models, nitrification inhibitors, soil sampling, sorption isotherms
Abstract:
Kinetics and adsorption-desorption behavior of a potent nitrification inhibitor, 2-amino 4-chloro 6-methyl pyrimidine (AM), was examined in Mollisol samples of different depths. Adsorption of AM was better accounted by pseudo-second order kinetics. Adsorption and desorption data of AM onto soil samples of different depths conformed to single surface Freundlich isotherm model. The values of ln K varied from −0.1515 (0–15 cm) to 1.5171 (45–60 cm) and of 1/n from 0.9961 (45–60 cm) to 1.3237 (30–45 cm). Computed values of desorption capacity (ln K’) varied from 3.4734 (0–15 cm) to 4.0674 (45–60 cm) while that of 1/n´ from 0.0017 (45–60 cm) to 0.0367 (0–15 cm). Intensity of desorption (1/n´) had significant positive correlation with soil electrical conductance and clay content. The values of desorption index (n´/n) varied from 14.60 (0–15 cm) to 472.33 (30–45 cm) indicating high degree of irreversibility of adsorbed AM and hence poor leaching from these soils.
Agid:
5769321