Root production, soil organic matter, soil moisture, and sorghum yield in an alley-cropping system with Acacia saligna (Labill.) Wendl. and Gliricidia sepium (Jacq.) Walp. in the Hararghe Highlands, Eastern Ethiopia

dc.contributor.advisor Richard C. Schultz
dc.contributor.author Abdelkadir, Abdu
dc.contributor.department Forestry
dc.date 2018-08-23T07:24:04.000
dc.date.accessioned 2020-06-30T07:12:54Z
dc.date.available 2020-06-30T07:12:54Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1997
dc.date.issued 1997
dc.description.abstract <p>A field experiment was conducted to study root production, soil organic matter, and moisture and sorghum yield in an alley-cropping system with Acacia saligna and Gliricidia sepium in the Hararghe highlands of Ethiopia. Tree hedgerows were planted on either side of a 4-m wide crop alley. Intra-row spacing between trees was 25, 50, and 100 cm. In October, 1994 and March, 1995 soil samples were taken at depths of 0-10 cm and 10-30 cm at 50 and 200 cm distance from the hedgerows using direct coring and mesh bags. Roots were separated from the soil by wet-sieving and root weight and root length density were determined. Measurements of soil organic carbon and total nitrogen to a depth of 0-60 cm were made. Field tensiometers were installed at 10, 30 and 60 cm depths. Soil water content was periodically monitored at similar depths. Sorghum grain yield, above-ground dry matter and height were determined. Acacia fine-root (≤2 mm) mass was significantly (p≤ 0.05) higher than for Gliricidia in the top 30 cm of soil. The presence of fine roots decreased by 55% and 40% for Acacia and Gliricidia, respectively, as the distance increased from 50 to 200 cm from hedgerows. Increase in tree root mass was accompanied by proportionally decreased crop root mass. Results of the March samples showed that the dry period is when trees allocate a higher proportion of carbon to the root system to stay competitive under the dry conditions. Leaf and twig dry matter of Acacia was significantly (p≤ 0.05) higher than for Gliricidia. Soil organic matter was lower by 20% and 10% in control and Gliricidia plots compared to Acacia plots. Soil moisture content and water potential measurements indicated that soil moisture was lower in Acacia plots than in the control and Gliricidia plots. Sorghum biomass, grain yield and height were significantly (p≤ 0.05) higher with Gliricidia and control than with Acacia. The sorghum yield reduction with Acacia could be largely due to competition for soil moisture.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/11435/
dc.identifier.articleid 12434
dc.identifier.contextkey 6455304
dc.identifier.doi https://doi.org/10.31274/rtd-180813-11656
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/11435
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/64692
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/11435/r_9725386.pdf|||Fri Jan 14 18:50:14 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Forest Sciences
dc.subject.disciplines Soil Science
dc.subject.keywords Forestry
dc.subject.keywords Forestry (Forest biology-wood science)
dc.subject.keywords Forest biology-wood science
dc.title Root production, soil organic matter, soil moisture, and sorghum yield in an alley-cropping system with Acacia saligna (Labill.) Wendl. and Gliricidia sepium (Jacq.) Walp. in the Hararghe Highlands, Eastern Ethiopia
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication e9d5e15e-fc6d-4315-b16b-e7fdff73268a
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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