dc.contributor.author | Kapal Debbie, B. | en |
dc.date.accessioned | 2008-12-08T20:51:30Z | |
dc.date.issued | 2008 | en |
dc.identifier.uri | https://hdl.handle.net/10182/701 | |
dc.description.abstract | The 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.iso | en | en |
dc.publisher | Lincoln University | en |
dc.subject | nutrient cycling | en |
dc.subject | arable cropping | en |
dc.subject | Avena sativa L. | en |
dc.subject | burning | en |
dc.subject | crop residue | en |
dc.subject | Hordeum vulgare L. | en |
dc.subject | leaching | en |
dc.subject | Lupinus angustifolius L. | en |
dc.subject | nitrate | en |
dc.subject | organic matter | en |
dc.subject | Triticum aestivum L. | en |
dc.title | Influence of a legume green manure crop on barley straw/stubble decomposition, and soil nitrogen retention and availability | en |
dc.type | Thesis | |
thesis.degree.grantor | Lincoln University | en |
thesis.degree.level | Masters | en |
thesis.degree.name | Master of Applied Science | en |
dc.subject.marsden | Fields of Research::300000 Agricultural, Veterinary and Environmental Sciences | en |
dc.subject.marsden | Fields of Research::270000 Biological Sciences | en |
lu.contributor.unit | Lincoln University | en |
lu.contributor.unit | Faculty of Agriculture and Life Sciences | en |
lu.contributor.unit | /LU/Agriculture and Life Sciences/UNK-AGLS | en |
pubs.organisational-group | /LU | |
pubs.organisational-group | /LU/Agriculture and Life Sciences | |
pubs.organisational-group | /LU/Agriculture and Life Sciences/UNK-AGLS | |
pubs.publication-status | Published | en |