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dc.contributor.authorVanlauwe, Bernard
dc.contributor.authorSanginga, N.
dc.contributor.authorMerckx, R.
dc.date.accessioned2019-12-04T11:21:14Z
dc.date.available2019-12-04T11:21:14Z
dc.date.issued2001
dc.identifier.citationVanlauwe, B., Sanginga, N. & Merckx, R. (2001). Alley cropping with Senna siamea in South-western Nigeria: II. Dry matter, total N, and urea-derived N dynamics of the Senna and maize roots. Plant and Soil, 231(2), 201-210.
dc.identifier.issn0032-079X
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3714
dc.description.abstractCrop and tree roots are crucial in the nutrient recycling hypotheses related to alley cropping systems. At the same time, they are the least understood components of these systems. The biomass, total N content and urea-derived N content of the Senna and maize roots in a Senna-maize alley cropping system were followed for a period of 1.5 years (1 maize-cowpea rotation followed by 1 maize season) to a depth of 90 cm, after the application of 15N labeled urea. The highest maize root biomass was found in the 0–10 cm layer and this biomass peaked at 38 and 67 days after planting the 1994 maize (DAP) between the maize rows (112 kg ha−1, on average) and at 38, 67 and 107 DAP under the maize plants (4101 kg ha−1, on average). Almost no maize roots were found below 60 cm at any sampling date. Senna root biomass decreased with time in all soil layers (from 512 to 68 kg ha−1 for the 0–10 cm layer between 0 and 480 DAP). Below 10 cm, at least 62% of the total root biomass consisted of Senna roots and this value increased to 87% between 60 and 90 cm. Although these observations support the existence of a Senna root `safety net' between the alleys which could reduce nutrient leaching losses, the depth of such a net may be limited as the root biomass of the Senna trees in the 60–90 cm layer was below 100 kg ha−1, equivalent to a root length density of only < 0.05 cm cm−3. The proportion of maize root N derived from the applied urea (%Ndfu) decreased significantly with time (from 21% at 21 DAP to 8% at 107 DAP), while %Ndfu of the maize roots at the second harvest (480 DAP) was only 0.6%. The %Ndfu of the Senna roots never exceeded 4% at any depth or sampling time, but decreased less rapidly compared to the %Ndfu of the maize roots. The higher %Ndfu of the maize roots indicates that maize is more efficient in retrieving urea-derived N. The differences in dynamics of the %Ndfu also indicate that the turnover of N through the maize roots is much faster than the turnover of N through the Senna roots. The recovery of applied urea-N by the maize roots was highest in the top 0–10 cm of soil and never exceeded 0.4% (at 38 DAP) between the rows and 7.1% (at 67 DAP) under the rows. Total urea N recovery by the maize roots increased from 1.8 to 3.2% during the 1994 maize season, while the Senna roots never recovered more than 0.8% of the applied urea-N at any time during the experimental period. These values are low and signify that the roots of both plants will only marginally affect the total recovery of the applied urea-N. Measurement of the dynamics of the biomass and N content of the maize and Senna roots helps to explain the observed recovery of applied urea-N in the aboveground compartments of the alley cropping system.
dc.description.sponsorshipDirectorate-General for Development Cooperation and Humanitarian Aid, Belgium
dc.language.isoen
dc.subjectAnion Exchange Capacity
dc.subjectCowpeas
dc.subjectFertilizer N
dc.subjectParticulate Organic Matter
dc.subjectCropping System
dc.subjectMaize Grain Yield
dc.titleAlley cropping with Senna siamea in southwestern Nigeria: 11 Dry matter, total N, and ureaderived N dynamics of the Senna and maize roots
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationKatholieke Universiteit Leuven
cg.coverage.regionAfrica
cg.coverage.regionAcp
cg.coverage.regionWest Africa
cg.coverage.regionEurope
cg.coverage.countryNigeria
cg.coverage.countryBelgium
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectCrop Husbandry
cg.iitasubjectMaize
cg.iitasubjectSmallholder Farmers
cg.iitasubjectPlant Breeding
cg.iitasubjectAgribusiness
cg.iitasubjectNatural Resource Management
cg.iitasubjectIntegrated Soil Fertility Management
cg.iitasubjectSoil Fertility
cg.iitasubjectSoil Health
cg.iitasubjectFarm Management
cg.iitasubjectSoil Information
cg.accessibilitystatusLimited Access
local.dspaceid95869


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