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  • Early macronutrient uptake and partitioning in Glycine max L. Merr

    Creator:
    Schuttler, Patti L.
    Abstract:
    Soybeans were grown in hydroponic solutions and in perlite to devise procedures to measure plant mineral accumulation and solution depletion over time. Electron emission spectrometry and micro-Kjeldahl-autoanalyzer analytic techniques were used to monitor mineral content of individual plants and their corresponding solutions. An automated computer assisted system of converting raw...
    Resource Type:
    Masters Thesis
    Full Text:
    .—^a ^Timothy LI imothy L. Righetti Soybeans were grown in hydroponic solutions and in perlite to

  • Diagnostic approaches to evaluate nutrient status, partitioning, mineral dynamics, and relationships with yield and fruit quality of 'Valencia' orange trees

    Creator:
    Tami, Mohamed
    Abstract:
    Five nutritional aspects of 'Valencia' orange production in Agadir, Morocco during 1989-1991 were evaluated: 1) the effect of N and K on yield and fruit quality, 2) leaf sampling time and diagnostic approaches to optimize mineral nutrition, 3) mass and mineral partitioning within individual trees, 4) K-Rb relationships, and 5)...
    Resource Type:
    Dissertation
    Full Text:
    expressed to Drs. T. L. Righetti and P. B. Lombard for their ideas, encouragement, guidance, and

  • Nitrogen dynamics in field grown comice pears

    Creator:
    Sanchez, Enrique E.
    Abstract:
    The dynamics of N was studied in field grown Comice/Provence quince BA29 pears in Medford, Oregon. Total tree biomass, N content, and ¹⁵N evaluations suggest that young pears require little N (48 kg N ha⁻¹ yr⁻¹). About 45% of total tree N present in dormant trees was remobilized into new...
    Resource Type:
    Dissertation
    Full Text:
    Field Grown Cornice Pears Abstract approved: „ „ „ 0 1 Timothy L. Righetti The dynamics

  • Digital analysis of remotely sensed images for evaluating color in turfgrass

    Creator:
    Friedkin, William C., 1954-
    Abstract:
    Most conventional approaches to rating turf color for different turf varieties grown under similar conditions or for the same variety grown under different cultural conditions employ a visual subjective rating. By digitizing remotely sensed images acquired by use of a helium filled blimp and a Canon EOS camera, we were...
    Resource Type:
    Masters Thesis
    Full Text:
    Sensed Images for Evaluating Color in Turfgrass Abstract approved: . ^_ Timothy U Righetti

  • An evaluation of the Diagnosis and Recommendation Integrated System (DRIS) on hazelnuts (Corylus avellana) in Oregon

    Creator:
    Alkoshab, Othman
    Abstract:
    This study evaluates Beufil's Diagnosis and Recommendation Integrated System (DRIS) on hazelnuts. Although sufficiency ranges are currently the main approach for fertilizer recommendations in Oregon, DRIS enhanced nutritional interpretations, and might alter recommendations. Reference values (DRIS norms) were developed using 15 years of published and unpublished field data. DRIS indices...
    Resource Type:
    Masters Thesis
    Full Text:
    ) IN OREGON Abstract approved: - .__ Dr. gimothy L. ^Righetti This study evaluates Beufil's

  • Chilling and nutritional requirements of fruit trees in Yemen

    Creator:
    Alkoshab, Othman
    Abstract:
    A portion of this study was initiated to provide the basis for implementing a chill unit accumulation procedure in Yemen. Most continuous or daily minimum, maximum temperature models severely underestimated chilling units, and slight modifications offered little improvement for the complex models. Only the Crossa Raynaud formula approximated generally accepted...
    Resource Type:
    Dissertation
    Full Text:
    steering me into new heights of science and research is Dr. Timothy L. Righetti. He provided me with

  • Effect of crop load on mineral uptake and partitioning in D'Anjou pears

    Creator:
    Meddouri, Messaoud
    Abstract:
    Three thinning levels were applied to twenty-five-year-old D'Anjou pear trees in a completely randomized design with five single-tree replicates on June 2, 1985. Samples of wood, shoot leaves, shoot twigs, spur leaves, spur twigs and fruits were taken every month during the season of growth for mineral analysis. Sampling an...
    Resource Type:
    Masters Thesis
    Full Text:
    : „ __. , ., . . , Tjlmothy L. Rigjetti Three thinning levels were applied to

  • Differences between mineral analyses from cork spotted and extra fancy 'Anjou' pear fruit

    Creator:
    Curtis, Daniel W.
    Abstract:
    The feasibility of using a post harvest sampling time for fruit testing in Anjou pears was evaluated. The goal was to determine if a simple and rapid analysis of fruit tissues could be useful in identifying potentially weak fruit that could be marketed before the onset of the storage disorder...
    Resource Type:
    Masters Thesis
    Full Text:
    ■'-'—jw-^ry •*■; Tiijlbthy L. Righetjfi The feasibility of using a post harvest sampling time for

  • Nitrogen partitioning and remobilization in field-grown apple trees

    Creator:
    Khemira, Habib
    Abstract:
    Uptake and cycling of nitrogen (N) in mature trees are not well understood. Fertilizer-N uptake, partitioning, and use-efficiency were studied in standard strain 'Topred Delicious' and spur strain 'Redspur Delicious' mature apple trees {Malus domestica Borck) on 'Malling 7A' (M.7A) rootstocks. The treatments consisted of a ground application in spring,...
    Resource Type:
    Dissertation
    Full Text:
    Remobilization in Field-grown Apple Trees. Abstract approved: timothy L. Righ^ti Anita N. Azarenko

  • Nitrogen use in container-grown woody ornamentals

    Creator:
    Sandrock, David Ray, 1971-
    Abstract:
    Lasting, effective solutions to nitrogen (N) loss from container nurseries must address layers of complexity ranging in scale from whole system nursery management to gene expression. Group-based On-site Active Learning (GOAL) was developed to aid nursery managers and related stakeholders (e.g. neighbors, policy makers, regulating agencies, researchers) in developing a...
    Resource Type:
    Dissertation
    Full Text:
    Container-grown Woody Ornamentals. Abstract Approved: „ ^ ._ AAita N. Azarenko "^ Timoliy L