Nitrogen fixation by common bean ( Phaseolus vulgaris L.) in pure and mixed stands in semi-arid south-east Kenya
Identifieur interne : 001E30 ( Main/Exploration ); précédent : 001E29; suivant : 001E31Nitrogen fixation by common bean ( Phaseolus vulgaris L.) in pure and mixed stands in semi-arid south-east Kenya
Auteurs : John M. Maingi [Kenya] ; Chris A. Shisanya [Kenya] ; Nkanata M. Gitonga [Kenya] ; Berthold Hornetz [Allemagne]Source :
- European Journal of Agronomy [ 1161-0301 ] ; 2001.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Kenya.
- topic : Phosphore, Rendement agricole.
English descriptors
- KwdEn :
Abstract
Research was carried out in the field on the effect of intercropping common bean and maize crops in a semi-arid zone of south-east Kenya over two rainy seasons in 1997. The experimental design was a randomised complete block design with eight treatments replicated four times. Significant differences were observed in total plant dry weight by the different treatments in pure stands, 21 days after emergence with higher values under mixed cropping system in common beans. However, at 42 days after emergence, plant dry weights in uninoculated common bean pure stands with N application were significantly higher than under other treatments. Common bean yields were significantly reduced by the maize intercrop. The inoculated common bean and N application treatment recorded the largest seed dry weights and subsequently yields per hectare. These findings suggest that intercropping common beans and maize considerably suppresses the yield of the former under the semi-arid conditions of south-east Kenya. Inoculation of common bean with the commercially available Rhizobium strain 446 on the other hand was effective and improved yields. Soil analysis of the experimental plots before and after one cropping season indicated that common beans increased N slightly or maintained it at the pre-planting levels. This was unlike the pure maize plots where there was a marked decline in soil N. There was however, a marked increase in soil phosphorus in all treatment plots.
Url:
DOI: 10.1016/S1161-0301(00)00080-0
Affiliations:
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Gitonga</name><affiliation wicri:level="1"><country xml:lang="fr">Kenya</country><wicri:regionArea>Department of Botany, Kenyatta University, PO Box 43844, Nairobi</wicri:regionArea><wicri:noRegion>Nairobi</wicri:noRegion></affiliation></author><author><name sortKey="Hornetz, Berthold" sort="Hornetz, Berthold" uniqKey="Hornetz B" first="Berthold" last="Hornetz">Berthold Hornetz</name><affiliation wicri:level="4"><country xml:lang="fr">Allemagne</country><wicri:regionArea>FB VI/Geogr.- Geosciences, University of Trier, D-54286 Trier</wicri:regionArea><orgName type="university">Université de Trèves</orgName><placeName><settlement type="city">Trèves (Allemagne)</settlement><region type="land" nuts="1">Rhénanie-Palatinat</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">European Journal of Agronomy</title><title level="j" type="abbrev">EURAGR</title><idno type="ISSN">1161-0301</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001">2001</date><biblScope unit="volume">14</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="12">12</biblScope></imprint><idno type="ISSN">1161-0301</idno></series><idno type="istex">558C62162108FEA361B12674C8A5D6EE79BA5DB0</idno><idno type="DOI">10.1016/S1161-0301(00)00080-0</idno><idno type="PII">S1161-0301(00)00080-0</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1161-0301</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Common bean</term><term>Crop yield</term><term>Field experiment</term><term>Inoculation</term><term>Intercropping</term><term>Kenya</term><term>Mixed cropping</term><term>Nitrogen fixation</term><term>Nodulation</term><term>Phaseolus vulgaris</term><term>Phosphorus</term><term>Rainy season</term><term>Rhizobium</term><term>Semi arid zone</term><term>Sole cropping</term><term>Yield</term><term>Zea mays</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Culture mixte</term><term>Culture pure</term><term>Essai en champ</term><term>Fixation azote</term><term>Inoculation</term><term>Kenya</term><term>Nodulation</term><term>Phaseolus vulgaris</term><term>Phosphore</term><term>Rendement</term><term>Rhizobium</term><term>Saison humide</term><term>Zea mays</term><term>Zone semi aride</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Kenya</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Phosphore</term><term>Rendement agricole</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Research was carried out in the field on the effect of intercropping common bean and maize crops in a semi-arid zone of south-east Kenya over two rainy seasons in 1997. The experimental design was a randomised complete block design with eight treatments replicated four times. Significant differences were observed in total plant dry weight by the different treatments in pure stands, 21 days after emergence with higher values under mixed cropping system in common beans. However, at 42 days after emergence, plant dry weights in uninoculated common bean pure stands with N application were significantly higher than under other treatments. Common bean yields were significantly reduced by the maize intercrop. The inoculated common bean and N application treatment recorded the largest seed dry weights and subsequently yields per hectare. These findings suggest that intercropping common beans and maize considerably suppresses the yield of the former under the semi-arid conditions of south-east Kenya. Inoculation of common bean with the commercially available Rhizobium strain 446 on the other hand was effective and improved yields. Soil analysis of the experimental plots before and after one cropping season indicated that common beans increased N slightly or maintained it at the pre-planting levels. This was unlike the pure maize plots where there was a marked decline in soil N. There was however, a marked increase in soil phosphorus in all treatment plots.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Kenya</li></country><region><li>Rhénanie-Palatinat</li></region><settlement><li>Trèves (Allemagne)</li></settlement><orgName><li>Université de Trèves</li></orgName></list><tree><country name="Kenya"><noRegion><name sortKey="Maingi, John M" sort="Maingi, John M" uniqKey="Maingi J" first="John M" last="Maingi">John M. Maingi</name></noRegion><name sortKey="Gitonga, Nkanata M" sort="Gitonga, Nkanata M" uniqKey="Gitonga N" first="Nkanata M" last="Gitonga">Nkanata M. Gitonga</name><name sortKey="Shisanya, Chris A" sort="Shisanya, Chris A" uniqKey="Shisanya C" first="Chris A" last="Shisanya">Chris A. Shisanya</name></country><country name="Allemagne"><region name="Rhénanie-Palatinat"><name sortKey="Hornetz, Berthold" sort="Hornetz, Berthold" uniqKey="Hornetz B" first="Berthold" last="Hornetz">Berthold Hornetz</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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