Effect of urease/nitrification inhibitor on urea nitrogen conversion in black soil and cinnamon soil.

doi:10.13287/j.1001-9332.202104.023

Abstract

Abstract: We studied the effects of urease/nitrification inhibitor combinations on urea hydrolysis and nitrification, aiming to screen out the effective inhibitor combinations for black soil and cinnamon soil in Northeast China. Urease inhibitor, N-butyl thiophosphate-triamine (NBPT), and its combination with nitrification inhibitor dicyandiamide (DCD), 3, 4-dimethylpyrazole phosphate (DMPP), 2-chloro-6 (trichloromethyl)-pyridine (CP), 2-amino-4-chloro-6-methylpyrimidine (AM) and 3-methylpyrazole (MP) were added to urea separately. Samples were collected 15 times in each of all the treatments during 125 days. We examined the changes of urea nitrogen, ammo-nium, nitrate, and nitrification inhibition rate in the two soils. Our results showed the hydrolysis of urea in black soil and cinnamon soil was about 7 d, and the addition of NBPT with or without diffe-rent nitrification inhibitors slowed down the hydrolysis to 21 d at least. Compared with the treatment with common urea, inhibitor addition significantly increased soil NH₄⁺-N, decreased soil NO₃^--N, and maintained the high NH₄⁺-N content in soil for a longer time. In black soil, application with nitrification inhibitor inhibited soil nitrification significantly and lasted for more than 125 d. DMPP and CP combined with NBPT increased the NH₄⁺-N content in black soil by 1.6-1.8 times, while the nitrification inhibition rate was 47.9% and 24.1% at 125 d, respectively. In the cinnamon soil, the application of nitrification inhibitor could prolong the duration of ammonium oxidation from 80 d to 110 d. DCD and DMPP combined with NBPT increased the NH₄⁺-N content in cinnamon soil by 2.1-3.4 times, while the nitrification inhibition rates at 125 d were 25.3% and 23.2%, respectively. Therefore, NBPT+DMPP combination with urea was recommended for utilization in black soil, followed by NBPT+CP. In cinnamon soil, NBPT+DCD combination with urea was recommended, followed by NBPT+DMPP.

Key words: urease inhibitor, nitrification inhibitor, urea, urea nitrogen, ammonium, nitrate, nitrification inhibition rate

LI Xue-hong, LI Dong-po, WU Zhi-jie, CUI Lei, XIAO Fu-rong, LI Yong-hua, ZHENG Ye, ZHANG Jin-ming. Effect of urease/nitrification inhibitor on urea nitrogen conversion in black soil and cinnamon soil.[J]. Chinese Journal of Applied Ecology, 2021, 32(4): 1352-1360.

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