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dc.contributor.authorZhong, Keren
dc.date.accessioned2017-12-04T03:12:03Z
dc.date.available2017-12-04T03:12:03Z
dc.date.issued2017-08-02
dc.identifier.urihttps://hdl.handle.net/10182/8825
dc.description.abstractGrowth and feed quality of five perennial ryegrass cultivars were compared under three water treatments: non-stress (field capacity, FC), mid-stress (50% FC) and high-stress (30% FC). There were three New Zealand cultivars (Alto, Bronsyn and Trojan), one Morrocan cultivar (Barberia) and one cultivar from Norway (Norway). Water stress reduced dry matter production, leaf water content, leaf width, and leaf photosynthetic rate and stomatal conductance of all cultivars by similar amounts. In contrast, water stress increased feed quality (dry matter digestibility and metabolizable energy) but again with no consistent cultivar effect. Averaged over all cultivars, the magnitude of the reduction in dry matter production (44% under high-stress and 21% under mid-stress) was substantially greater than that of the increase in feed quality (2% under mid-stress and 4% under high-stress for dry matter digestibility, 3% under mid-stress and 5% under high-stress for metabolizable energy). For all cultivars, dry matter production and feed quality returned to normal after rehydration of high water stressed plants. It appears that it will be very difficult to develop a cultivar with maintained growth under water stress conditions. However, against this, perennial ryegrass cultivars in general have a strong ability to recover from drought which is an extremely important characteristic in perennial pastures subject to periodic water stress.en
dc.language.isoenen
dc.publisherLincoln Universityen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectperennial ryegrassen
dc.subjectLolium perenne L.en
dc.subjectdroughten
dc.subjectdry matter productionen
dc.subjectleaf water contenten
dc.subjectleaf widthen
dc.subjectphotosynthesisen
dc.subjectstomatal conductanceen
dc.subjectfeed qualityen
dc.subjectdry matter digestibilityen
dc.subjectcrude proteinen
dc.subjectmetabolisable energyen
dc.titleGrowth and feed quality of five perennial ryegrass (Lolium perenne L.) cultivars under three water treatmentsen
dc.typeThesisen
thesis.degree.grantorLincoln Universityen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Applied Scienceen
lu.thesis.supervisorAndrews, Mitchell
lu.contributor.unitDepartment of Agricultural Sciencesen
dc.subject.anzsrc070305 Crop and Pasture Improvement (Selection and Breeding)en
dc.subject.anzsrc0703 Crop and Pasture Productionen


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