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Alternative orchard floor management practices, soil quality, nitrogen fertilizer uptake, and apple tree growth and yield

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dc.contributor.advisor Azarenko, Anita N.
dc.creator McDonald, Sarah Finger
dc.date.accessioned 2007-04-16T21:47:15Z
dc.date.available 2007-04-16T21:47:15Z
dc.date.copyright 2007-03-15
dc.date.issued 2007-04-16T21:47:15Z
dc.identifier.uri http://hdl.handle.net/1957/4552
dc.description Graduation date: 2007
dc.description.abstract Orchard floor management (OFM) practices can improve soil function and alter the soil biological community. Soil function is dependent on soil forming materials and on management practices but little is known about how OFM affect orchard soil quality, fertilizer N uptake, or tree growth and production. Research plots were located in Corvallis, OR (LB) (Malus x domestica ‘Fuji’ grafted on dwarfing M26EMLA rootstock) and Hood River, OR (HR) (M. x domestica ‘Red Delicious’ grafted on M7EMLA rootstock). Treatments were begun in 2001 in a splitplot completely randomized design with 3 replications. Main plot treatments were weed control method, cultivation and postemergent herbicide. Sub plot treatments were an unamended control, bark mulch, compost, and vetch/barley mown and raked into the tree row. Depleted 15 (NH4)2SO4 was applied to a single tree in each plot at bud break. Trees were destructively harvested in the fall of 2003. Weed control method had no effect on soil organic matter (SOM) content and few effects on other soil properties. There were no significant differences between cultivation and herbicide in % N derived from fertilizer (NDFF) in the trees despite the potential for altered mineralization rates with these treatments. Growth of young trees at HR was reduced by cultivation because weed growth was not controlled. Compost increased SOM content at both LB and HR. Compost also had the most consistent effect on other soil properties and soil respiration. Amendment did not affect the % N in the trees, but vetch/barley amendment increased % NDFF at HR and fertilizer uptake efficiency (FUE) at LB. % NDFF and FUE were low in compost amended plots. Trees in compost acquired N from sources other than fertilizer. Yield was increased by bark mulch and decreased by compost at HR. At LB vegetative growth was increased by compost. The relationships between specific changes in the soil and improved orchard performance are still unclear. However, there are correlations between growth and soil characteristics that suggest that alternative management practices, especially compost amendment, do have the potential to decrease the need for chemical fertilizer inputs. en
dc.format.extent 1670106 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject Malus domestica en
dc.subject 15N en
dc.subject compost en
dc.subject mulch en
dc.subject cultivation en
dc.subject post-emergent herbicide en
dc.subject roots en
dc.subject.lcsh Soil amendments -- Oregon -- Corvallis en
dc.subject.lcsh Soil amendments -- Oregon -- Hood River en
dc.subject.lcsh Orchards -- Oregon -- Corvallis -- Management en
dc.subject.lcsh Orchards -- Oregon -- Hood River -- Management en
dc.subject.lcsh Apples -- Oregon -- Corvallis -- Growth en
dc.subject.lcsh Apples -- Oregon -- Hood River -- Growth en
dc.subject.lcsh Soil management -- Oregon -- Corvallis en
dc.subject.lcsh Soil management -- Oregon -- Hood River en
dc.title Alternative orchard floor management practices, soil quality, nitrogen fertilizer uptake, and apple tree growth and yield en
dc.type Thesis en
dc.degree.name Doctor of Philosophy (Ph. D.) in Horticulture en
dc.degree.level Doctoral en
dc.degree.discipline Agricultural Sciences en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Sulzman, Elizabeth
dc.contributor.committeemember Schreiner, Paul
dc.contributor.committeemember Stone, Alex
dc.contributor.committeemember Fisher, Glen

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