| dc.contributor.author | Vanlauwe, Bernard |
| dc.contributor.author | Diels, J. |
| dc.contributor.author | Duchateau, L. |
| dc.contributor.author | Sanginga, N. |
| dc.contributor.author | Merckx, R. |
| dc.date.accessioned | 2019-12-04T11:33:24Z |
| dc.date.available | 2019-12-04T11:33:24Z |
| dc.date.issued | 1998 |
| dc.identifier.citation | Vanlauwe, B., Diels, J., Duchateau, L., Sanginga, N. & Merckx, R. (1998). Mineral N dynamics in bare and cropped Leucaena leucocephala and Dactyladenia barteri alley cropping systems after the addition of 15N-labelled leaf residues. European Journal of Soil Science, 49, 417-425. |
| dc.identifier.issn | 1351-0754 |
| dc.identifier.uri | https://hdl.handle.net/20.500.12478/5666 |
| dc.description.abstract | In tropical cropping systems with few external imputs, efficient management of mineral N derived from added organic residues is essential for the proper functioning of the system. We studied the dynamics of mineral Nitroden (N) in the top 100 cm of soil with a system tensiometers and suction cups after applying 15N-labelled Leucaena Leucocephala and Dactyladenia bacteria residues to bare and cropped microplots installed in the respective alley cropping systems, and folloed the fate of the N for two maize-cowpea rotations (1992 and 1993).
Fifty days after applying the residues (DAA), 20% of the added residue N was found in the soil profile of the bare Leucaena treatment and 5% under Dactyladenia, compared with 5% and 1%, respectively, where cropped. All values decreased to about 1% after 505 days. In the cropped soil, no mineral N derived from the residues was lost by leaching during the first 6 weeks.
As the maize grew, the soil profile was gradually depleted of nitrate to near zero in the Dactyladenia treatment, whereas during the cowpea season the amount of nitrate N increased to 36 kg N ha-1 for the Leucaena treatment, and 26 kg N ha-1 for the Dactyladenia treatment. The soil of the bare microplots contained substantially more nitrate N (98 and 47 kg N ha-1 during the first year on average, under Luecaena and Dactyladenia, respectively) than that of the cropped microplots, except during 1993 cowpea season. Nitrate residing in the subsoil (80-100 cm) in the bare treatmentwas not readily leached to deeper soil. The risk of losses of native mineral N was greater during the first 50 DAA and to a lesser extent during the cowpea seasons. Improved management of the hedgerows could increase the potential of the hedgerow trees to recycle mineral N. |
| dc.description.sponsorship | Directorate-General for Development Cooperation and Humanitarian Aid, Belgium |
| dc.language.iso | en |
| dc.subject | Cropping Systems |
| dc.subject | Residues |
| dc.subject | Bacteria |
| dc.subject | Soil Profiles |
| dc.subject | Maize |
| dc.subject | Cowpeas |
| dc.subject | Soil |
| dc.title | Mineral N dynamics in bare and cropped Leucaena leucocephala and Dactyladenia barteri alley cropping systems after the addition of 15Nlabelled leaf residues |
| dc.type | Journal Article |
| dc.description.version | Peer Review |
| cg.contributor.affiliation | International Institute of Tropical Agriculture |
| cg.contributor.affiliation | Faculty of Applied Agricultural Sciences, Belgium |
| cg.contributor.affiliation | International Livestock Research Institute |
| cg.coverage.region | Africa |
| cg.coverage.region | West Africa |
| cg.coverage.country | Nigeria |
| cg.isijournal | ISI Journal |
| cg.authorship.types | CGIAR and advanced research institute |
| cg.iitasubject | Crop Systems |
| cg.iitasubject | Soil Fertility |
| cg.iitasubject | Maize |
| cg.iitasubject | Cowpea |
| cg.iitasubject | Soil Health |
| cg.accessibilitystatus | Limited Access |
| local.dspaceid | 104946 |
