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dc.contributor.authorKapal Debbie, B.en
dc.date.accessioned2008-12-08T20:51:30Z
dc.date.issued2008en
dc.identifier.urihttps://hdl.handle.net/10182/701
dc.description.abstractThe incorporation of cereal straw/stubble often immobilises nitrogen (N). This can help conserve N in soil in organic forms, thus reducing loss through leaching over dormant winter periods. However, N-depressions that arise during decomposition can reduce crop yield. The inclusion of a legume green manure can supply fixed-N, thus alleviating the low N availability to crops. In this study, the effect of lupin (Lupinus angustifolius L.) green manure incorporation on barley (Hordeum vulgare L.) straw/stubble decomposition, and N availability was investigated. A field experiment was used to determine the effects of the green manure on decomposition. Decomposition of straw/stubble was monitored using the litterbag technique. Following green manure incorporation, soil cores were incubated in a glasshouse to determine mineral-N availability. Though not significant, the inclusion of lupin green manure seemed to increase the decomposition of straw/stubble during the growth period, then slowing it after its incorporation at 110 d. This was described by a logarithmic pattern of loss of - 4.97 g AFDW residue day⁻¹, with 60% remaining after 140 d. Treatments without lupin had a linear decomposition of - 0.12 g AFDW residue day⁻¹, with 49% remaining after 140 d. The loss of cellulose confirmed the differences in decomposition with the inclusion of lupin resulting in 2.79% less cellulose remaining in straw/stubble after 140 d compared to its exclusion. Lupin significantly increased pot oat N uptake and DM yield by 55 % and 46 %, respectively, compared to its exclusion. However, this effect was not observed in field sown wheat yields and the soil mineral-N measurements made. This study showed that the potential of lupin to increase straw/stubble decomposition by improving the retention and availability of N, leading to long-term yield benefits, needed further investigation.en
dc.language.isoenen
dc.publisherLincoln Universityen
dc.subjectnutrient cyclingen
dc.subjectarable croppingen
dc.subjectAvena sativa L.en
dc.subjectburningen
dc.subjectcrop residueen
dc.subjectHordeum vulgare L.en
dc.subjectleachingen
dc.subjectLupinus angustifolius L.en
dc.subjectnitrateen
dc.subjectorganic matteren
dc.subjectTriticum aestivum L.en
dc.titleInfluence of a legume green manure crop on barley straw/stubble decomposition, and soil nitrogen retention and availabilityen
dc.typeThesis
thesis.degree.grantorLincoln Universityen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Applied Scienceen
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciencesen
dc.subject.marsdenFields of Research::270000 Biological Sciencesen
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unit/LU/Agriculture and Life Sciences/UNK-AGLSen
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/UNK-AGLS
pubs.publication-statusPublisheden


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