Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 56, Issue 2, Pages 185-194Publisher
SPRINGER
DOI: 10.1007/s00374-019-01411-5
Keywords
Urea fertilizer; Urease inhibitor; Nitrification inhibitor; Arable soil; Soil microbial diversity; Nitrification genes
Categories
Funding
- BBSRC ISP S2N [BBS/E/C/000I0310]
- CiNAg [BB/N013468/1]
- BBSRC [BBS/E/C/000I0310, BB/N013468/1] Funding Source: UKRI
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Inhibitors of urease and ammonia monooxygenase can limit the rate of conversion of urea to ammonia and ammonia to nitrate, respectively, potentially improving N fertilizer use efficiency and reducing gaseous losses. Winter wheat grown on a sandy soil in the UK was treated with urea fertilizer with the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT), the nitrification inhibitor dicyandiamide (DCD) or a combination of both. The effects on soil microbial community diversity, the abundance of genes involved in nitrification and crop yields and net N recovery were compared. The only significant effect on N-cycle genes was a transient reduction in bacterial ammonia monooxygenase abundance following DCD application. However, overall crop yields and net N recovery were significantly lower in the urea treatments compared with an equivalent application of ammonium nitrate fertilizer, and significantly less for urea with DCD than the other urea treatments.
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