Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa
The fate of 15N-labeled plant residues from different cover-cropping systems and labeled inorganic N fertilizer in the organic, soil mineral, microbial biomass and soil organic matter (SOM) particle-size fractions was investigated in a sandy Lixisol. Plant residues were from mucuna (legume), lablab (legume), imperata (grass), maize (cereal) and mixtures of mucuna or lablab with imperata or maize, applied as a surface mulch. Inorganic N fertilizer was applied as 15N-(NH4)2SO4 at two rates (21 and 42 mg N kg–1 soil). Total N release from mucuna or lablab residues was 2–3 times higher than from the other residues, whereas imperata immobilized N throughout the study period. In contrast, 15N was mineralized from all the plant residues irrespective of the mineralization–immobilization pattern observed for total N. After 168 days, 69% of soil mineral N in mucuna- or lablab-mulched soils was derived from the added residues, representing 4–8% of residue N, whereas 9–30% of inorganic N was derived from imperata, maize and the mixed residues. At the end of the study, 4–19% of microbial biomass N was derived from the added residue/fertilizer-N, accounting for 1–3% of added residue-N. Averaged across treatments, particulate SOM fractions accounted for less than 1% of the total soil by weight but contained 20% of total soil C and 8% of soil N. Soils amended with mucuna or lablab incorporated more N in the 250–2000 μm SOM pool, whereas soil amended with imperata or the mixed residues incorporated similar proportions of labeled N in the 250–2000 μm and 53–250 μm fractions. In contrast, in soils receiving the maize or inorganic fertilizer-N treatments, higher proportions of labeled N were incorporated into the 53–250 μm than the 250–2000 μm fractions. The relationship between these differences in residue/fertilizer-N partitioning into different SOM particle-size fractions and soil productivity is discussed.
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2000
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dig-cgspace-10568-999132023-06-12T21:03:14Z Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa Ibewiro, B. Vanlauwe, Bernard Sanginga, P. Merckx, R. cropping systems soil fertilizers maize The fate of 15N-labeled plant residues from different cover-cropping systems and labeled inorganic N fertilizer in the organic, soil mineral, microbial biomass and soil organic matter (SOM) particle-size fractions was investigated in a sandy Lixisol. Plant residues were from mucuna (legume), lablab (legume), imperata (grass), maize (cereal) and mixtures of mucuna or lablab with imperata or maize, applied as a surface mulch. Inorganic N fertilizer was applied as 15N-(NH4)2SO4 at two rates (21 and 42 mg N kg–1 soil). Total N release from mucuna or lablab residues was 2–3 times higher than from the other residues, whereas imperata immobilized N throughout the study period. In contrast, 15N was mineralized from all the plant residues irrespective of the mineralization–immobilization pattern observed for total N. After 168 days, 69% of soil mineral N in mucuna- or lablab-mulched soils was derived from the added residues, representing 4–8% of residue N, whereas 9–30% of inorganic N was derived from imperata, maize and the mixed residues. At the end of the study, 4–19% of microbial biomass N was derived from the added residue/fertilizer-N, accounting for 1–3% of added residue-N. Averaged across treatments, particulate SOM fractions accounted for less than 1% of the total soil by weight but contained 20% of total soil C and 8% of soil N. Soils amended with mucuna or lablab incorporated more N in the 250–2000 μm SOM pool, whereas soil amended with imperata or the mixed residues incorporated similar proportions of labeled N in the 250–2000 μm and 53–250 μm fractions. In contrast, in soils receiving the maize or inorganic fertilizer-N treatments, higher proportions of labeled N were incorporated into the 53–250 μm than the 250–2000 μm fractions. The relationship between these differences in residue/fertilizer-N partitioning into different SOM particle-size fractions and soil productivity is discussed. 2000 2019-03-03T05:54:02Z 2019-03-03T05:54:02Z Journal Article Ibewiro, B., Vanlauwe, B., Sanginga, P. & Merckx, R. (2000). Transformations and recovery of residue and fertilizer nitrogen-15 in a sandy Lixisol of West Africa. Biology and Fertility of Soils, 31(3-4), 261-269. https://hdl.handle.net/10568/99913 en Limited Access p. 261-269 |
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cropping systems soil fertilizers maize cropping systems soil fertilizers maize Ibewiro, B. Vanlauwe, Bernard Sanginga, P. Merckx, R. Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
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The fate of 15N-labeled plant residues from different cover-cropping systems and labeled inorganic N fertilizer in the organic, soil mineral, microbial biomass and soil organic matter (SOM) particle-size fractions was investigated in a sandy Lixisol. Plant residues were from mucuna (legume), lablab (legume), imperata (grass), maize (cereal) and mixtures of mucuna or lablab with imperata or maize, applied as a surface mulch. Inorganic N fertilizer was applied as 15N-(NH4)2SO4 at two rates (21 and 42 mg N kg–1 soil). Total N release from mucuna or lablab residues was 2–3 times higher than from the other residues, whereas imperata immobilized N throughout the study period. In contrast, 15N was mineralized from all the plant residues irrespective of the mineralization–immobilization pattern observed for total N. After 168 days, 69% of soil mineral N in mucuna- or lablab-mulched soils was derived from the added residues, representing 4–8% of residue N, whereas 9–30% of inorganic N was derived from imperata, maize and the mixed residues. At the end of the study, 4–19% of microbial biomass N was derived from the added residue/fertilizer-N, accounting for 1–3% of added residue-N. Averaged across treatments, particulate SOM fractions accounted for less than 1% of the total soil by weight but contained 20% of total soil C and 8% of soil N. Soils amended with mucuna or lablab incorporated more N in the 250–2000 μm SOM pool, whereas soil amended with imperata or the mixed residues incorporated similar proportions of labeled N in the 250–2000 μm and 53–250 μm fractions. In contrast, in soils receiving the maize or inorganic fertilizer-N treatments, higher proportions of labeled N were incorporated into the 53–250 μm than the 250–2000 μm fractions. The relationship between these differences in residue/fertilizer-N partitioning into different SOM particle-size fractions and soil productivity is discussed. |
format |
Journal Article |
topic_facet |
cropping systems soil fertilizers maize |
author |
Ibewiro, B. Vanlauwe, Bernard Sanginga, P. Merckx, R. |
author_facet |
Ibewiro, B. Vanlauwe, Bernard Sanginga, P. Merckx, R. |
author_sort |
Ibewiro, B. |
title |
Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
title_short |
Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
title_full |
Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
title_fullStr |
Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
title_full_unstemmed |
Transformations and recovery of residue and fertilizer nitrogen15 in a sandy Lixisol of West Africa |
title_sort |
transformations and recovery of residue and fertilizer nitrogen15 in a sandy lixisol of west africa |
publishDate |
2000 |
url |
https://hdl.handle.net/10568/99913 |
work_keys_str_mv |
AT ibewirob transformationsandrecoveryofresidueandfertilizernitrogen15inasandylixisolofwestafrica AT vanlauwebernard transformationsandrecoveryofresidueandfertilizernitrogen15inasandylixisolofwestafrica AT sangingap transformationsandrecoveryofresidueandfertilizernitrogen15inasandylixisolofwestafrica AT merckxr transformationsandrecoveryofresidueandfertilizernitrogen15inasandylixisolofwestafrica |
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1779061356183420928 |