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Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil.

ABSTRACT: 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.

SUBMITTER: Fu Q

PROVIDER: S-EPMC6981326 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil.

Fu Qingling Q Abadie Maïder M Blaud Aimeric A Carswell Alison A Misselbrook Tom H TH Clark Ian M IM Hirsch Penny R PR

Biol Fertil Soils. 20191125 2

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 abundan ...[more]

PMID: 32038053

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Project description:The sequestration in soil of organic carbon (SOC) derived from atmospheric carbon dioxide (CO2) by replacing arable crops with leys, has been measured over 70?years on a sandy loam soil. The experiment was designed initially to test the effect of leys on the yields of arable crops. A 3-year grazed grass with clover (grass?+?clover) ley in a 5-year rotation with arable crops increased percentage organic carbon (%OC) in the top 25?cm of the soil from 0.98 to 1.23 in 28?years, but with little further increase during the next 40?years with all-grass leys given fertilizer nitrogen (N). In this second period, OC inputs were balanced by losses, suggesting that about 1.3% OC might be near the equilibrium content for this rotation. Including 3-year lucerne (Medicago sativa) leys had little effect on %OC over 28?years, but after changing to grass?+?clover leys, %OC increased to 1.24 during the next 40?years. Eight-year leys (all grass with N or grass?+?clover) in 10-year rotations with arable crops were started in the 1970s, and after three rotations %OC had increased to ca. 1.40 in 2000-2009. Over 70?years, %OC declined from 0.98 to 0.94 in an all-arable rotation with mainly cereals and to 0.82 with more root crops. Applications of 38?t?ha-1 farmyard manure (FYM) every fifth year increased %OC by 0.13% by the mid-1960s when applications ceased. Soil treated with FYM still contained 0.10% more OC in 2000-2009. Changes in the amount of OC have been modelled with RothC-26.3 and estimated inputs of C for selected rotations. Little of the OC input during the 70?years has been retained; most was retained in the grazed ley rotation, but 9?t?ha-1 only of a total input of 189?t?ha-1. In other rotations more than 98% of the total OC input was lost. Despite large losses of C, annual increases in OC of 4‰ are possible on this soil type with the inclusion of grass or grass?+?clover leys or the application of FYM, but only for a limited period. Such increases in SOC might help to limit increases in atmospheric CO2.HighlightsCan leys sequester significant amounts of atmospheric CO 2 in SOM and contribute to the 4‰ initiative?Changes in the percentage and amount of OC were measured and modelled over 70?years and OC losses estimated.Three-year grass or grass?+?clover leys increased %OC, but only to an equilibrium level that was then maintained.Despite large losses, sequestering CO 2-C at 4‰?year-1 by growing grass or grass?+?clover leys is possible.

Dataset Information

Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil.

Publications

Effects of urease and nitrification inhibitors on soil N, nitrifier abundance and activity in a sandy loam soil.

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