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Evaluation of some nitrification inhibitors at different temperatures under laboratory conditions

Author(s): Rehmat Ali, Hina Kanwal, Zafar Iqbal, Mohammad Yaqub | Junaid Ali Khan | Tariq Mahmood

Journal: Soil & Environment
ISSN 2074-9546

Volume: 31;
Issue: 2;
Start page: 134;
Date: 2012;
Original page

Keywords: 4-Amino-1 | 2 | 4-triazole | 1H-benzotriazole | benzothiazole | lignosulfonic acid | nitrification | pyrazoles

Effect of eight compounds on nitrification of the applied (NH4)2 SO4 was studied in two soils incubated at high (35°C) and moderate (16°C) temperatures. The tested compounds included: 1H-benzotriazole; 4-amino-1,2,4-triazole; benzothiazole; 3-methylpyrazole-1-carboxamide; 4-bromo-3-methylpyrazole; pyrazole; lignosulfonic acid, molecular weight 52000, 6% S; and lignosulfonic acid, molecular weight 12000, 2% S. In the absence of inhibitors, nitrification of the applied ammonium was complete within one week at 35°C, whereas it took two to three weeks at 16°C. At 35°C, ATC was the most effective compound causing 44-71% inhibition up to four weeks when applied at 10 mg kg−1. The inhibitory effect of ATC increased with increasing application rate to 30 mg kg−1 (92–94% inhibition for four weeks). Although another compound viz. PZ applied at 10 mg kg−1 was also effective at 35°C, the inhibitory effect persisted up to three weeks (44-48% inhibition). At 16 °C, six of the test compounds (BTr, ATC, BTh, MPC, BMP and PZ) effectively inhibited nitrification at least up to four weeks. At 16 °C also, ATC was the most effective compound causing 84-90% inhibition for four weeks when applied at 10 mg kg−1. The results suggested that ATC can be a potential nitrification inhibitor for agricultural use under summer as well as under winter soil temperatures prevailing in the Indo-Gangetic Plains of the South Asia.
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