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dc.contributor.authorWhite, S. R.
dc.date.accessioned2012-03-28T22:33:37Z
dc.date.available2012-03-28T22:33:37Z
dc.date.issued1989
dc.identifier.urihttps://hdl.handle.net/10182/4389
dc.description.abstractAbove ground dry matter production, sward composition, and herbage mineral levels were measured from three ley mixtures sown on a Wakanui silt loam, Lincoln College, Canterbury. Additionally soil fertility (exchangeable sodium, potassium, calcium and magnesium, total nitrogen, total carbon, and phosphorous fractions) and aggregate stability were measured from the three ley treatments and a continuously cropped site. The three treatments were a ryegrass (Lolium perenne) white clover ley (Trifolium repens) ley, a lucerne (Medicago sativa) - grass based mixed herb ley, and a lucerne based mixed herb ley.The continuously cropped site was newly sown in tall fescue (Fesiuca arundinacea) for seed. Previous crops were broad beans (Vicia faba), linseed (Linum usitatissimum), wheat (Triticum aestivum), ryegrass, and white clover. Literature reviewed suggested poor herb survival in mixed herb leys in the presence of legumes and grasses, and insignificant differences in the mineral status of the surface soil. Results showed herb percentage of total dry matter was low (<10%). Differences in soil fertility between ley treatments were small, but significantly greater (P < 0.05) than the continuously cropped site. Aggregate stability was low (20%) in the continuously cropped site, and increased to 48% with increasing grass percent in the ley treatments. Chemical analysis of herbage showed chicory (Cicorum intybus) was highest in phosphorous and zinc but it was not consistently higher in all minerals compared to other species as, reported by other studies. It is concluded that deep rooting perennial herbs such as chicory have no advantage over deep rooting, nitrogen fixing legumes such as lucerne.en
dc.formatvii, 94 leaves
dc.language.isoenen
dc.publisherLincoln College, University of Canterburyen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectmixed herb leyen
dc.subjectryegrassen
dc.subjectLolium perenneen
dc.subjectwhite cloveren
dc.subjectTrifoliumen
dc.subjectlucerneen
dc.subjectMedicago sativaen
dc.subjectchicoryen
dc.subjectCichorium intybusen
dc.subjectdry matter productionen
dc.subjectbotanical compositionen
dc.subjectherbage mineral levelsen
dc.subjectsoil fertilityen
dc.subjectaggregate stabilityen
dc.titleRole of mixed herb leys in New Zealand organic cropping systems : a dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science (Honours) in the Lincoln University [i.e. College]en
dc.typeDissertationen
thesis.degree.grantorUniversity of Canterburyen
thesis.degree.levelOtheren
thesis.degree.nameBachelor of Agricultural Scienceen
lu.thesis.supervisorDaly, Gavin
lu.thesis.supervisorLucas, Dick
lu.contributor.unitDepartment of Agricultural Sciencesen
dc.rights.accessRightsDigital thesis can be viewed by current staff and students of Lincoln University only.en
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.subject.anzsrc0503 Soil Sciencesen


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