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  • Chilling requirement affects plant response to hydrogen cyanamide in apple cultivars

    Creator:
    Ghariani, Karim
    Abstract:
    Chilling requirements of 43 apple and 38 pear cultivars were estimated over a 2 year period by cutting shoots in the field at weekly intervals and forcing them in a warm greenhouse for 4 weeks. For apples, the mean values ranged from 490 Chill Units (CU) +- 1 for 'Dorsett...
    Resource Type:
    Masters Thesis
    Full Text:
    to hydrogen cyanamide depends on several factors: concentration of the chemical, time of

  • The effects of light on photosynthesis and rooting of leafy cuttings of Pisum sativum L.

    Creator:
    Davis, Tim D.
    Abstract:
    The effects of light incident on leafy cuttings is quite complex because' light influences several factors which may affect root formation. One effect of light is to influence the carbohydrate status of the cutting by influencing photosynthesis. The role of current photosynthate in the rooting of leafy cuttings is uncertain....
    Resource Type:
    Masters Thesis
    Full Text:
    The effect on rooting of defoliation of pea cuttings at different times during the rooting period 55

  • Effects of irrigation and nitrogen on cauliflower development, yield and quality

    Creator:
    Bratsch, Anthony D.
    Abstract:
    Field experiments were conducted with cauliflower (Brassica oleracea var. botrytis cv. Snowball Y ) to determine crop development, yield, quality and maturity response to various seasonal water levels, and to specific water stress timing in relation to curd initiation. The effects of nitrogen rate, timing, and source and the application...
    Resource Type:
    Dissertation
    Full Text:
    environment 57 plant density 58 CHAPTERS EFFECT OF NITROGEN RATES AND TIMING ON DIFFERENTIALLY

  • Modeling purple nutsedge (Cyperus rotundus L.) growth : preliminary evaluation of light intensity, soil moisture and herbicide effects

    Creator:
    Amerasinghe, A. A. L.
    Abstract:
    Purple nutsedge [Cyperus rotundas L.) has been recognized as one of the most troublesome perennial weeds of agricultural lands in tropical and some temperate regions. This research sought to determine the effects of timing of herbicides, shading, and soil moisture on plant population growth and tuber production of purple nutsedge...
    Resource Type:
    Dissertation
    Full Text:
    regulation 126 5.5 Effect of plant density on shoot production from a single plant of purple nutsedge

  • 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:
    Literature Cited 46 CHAPTER 4. EFFECT OF TREE NITROGEN STATUS AND LEAF CANOPY POSITION ON THE

  • Onion (Allium cepa L.) cultivar tolerance to bromoxynil

    Creator:
    Madrid, Modesto T.
    Abstract:
    In onions, sensitive cultivars diminish the usefulness of the selective herbicide bromoxynil. Tolerant cultivars can overcome this limitation. A better understanding of the biochemistry, physiology and genetics of bromoxynil tolerance could lead to improved weed control programs in onions. Onion cultivar response to bromoxynil was studied under greenhouse conditions. Tolerant...
    Resource Type:
    Dissertation
    Full Text:
    LITERATURE 42 MATERIALS AND METHODS 47 Effect of ethofumesate on cultivar tolerance to bromoxynil

  • Glyphosate activity as affected by spray drop size and leaf coverage

    Creator:
    King, Wayne O.
    Abstract:
    Bean shoot parts that respond to glyphosate (N- (phosphonomethyl)glycine) in ways useful for bioassay were determined by applying glyphosate doses of 3.8 to 60.3 ug ae per plant to the simple leaves when the first trifoliolate leaflets were about 1 cm long. Dry weights of parts that were almost fully...
    Resource Type:
    Dissertation
    Full Text:
    affecting spray drop retention, and Lake and Taylor (1974) found no effect of drop size on spray retention

  • Growth in herbaceous perennials

    Creator:
    Nakajima, Rie
    Abstract:
    Several studies of herbaceous perennials have addressed the effects of environmental factors during and after production, inherent cold hardiness, and post-harvest handling procedures to enhance flowering and growth during establishment. The regrowth of both woody and herbaceous forage plants following establishment is reported to be directly related to reserve-nitrogen content....
    Resource Type:
    Masters Thesis
    Full Text:
    to determine the effect of pre-washing on growth performance. After each plant was washed, it was

  • 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:
    ' orange production in Agadir, Morocco during 1989-1991 were evaluated: 1) the effect of N and K on yield

  • Influence of nitrogen form ratio and calcium on greenhouse and field performance of watermelon

    Creator:
    Lamb, Michael J.
    Abstract:
    Watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai var. Crimson Sweet) was seeded in a commercial peat mix in multicell containers (72 cells-tray⁻¹, 40 cm³-cell⁻¹) in July 1989 and April 1990. In 1989, the medium was amended with CaC0₃ at 10% w:v. In 1990, no CaC0₃ amendment was made. Watermelon seedling...
    Resource Type:
    Masters Thesis
    Full Text:
    ) and non-calcareous media, suggesting a synergistic effect on plant growth above that of buffering