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  • Author or Editor: J. N. Joiner x
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Abstract

Florida currently has 26 state supported junior colleges and each campus is an autonomous unit which contributes to tremendous variability in administrative philosophy, curricula, and academic standards. All of these colleges have open door admission policies in that all graduates of high schools within the state are eligible for admission. Non-high school graduates may enter many community junior colleges to complete secondary educational programs.

Students wishing to transfer to the University of Florida as juniors must have completed an Associate of Arts (AA) Degree from a junior college with a grade point average (GPA) of 2.0 or better in academic courses based on a 4 point system of evaluation. They might enter without completing such a program provided they had been eligible to have entered the University of Florida as freshmen. The University of Florida requires 300 or higher score on the Florida 12th Grade Test, which usually limits eligibility to the top 2/5 ths of high school graduates in the state.

Open Access

Abstract

Adventitious root formation was stimulated with foliar application of indolebutyric acid (IBA) from 1000 to 1500 mg/liter for juvenile and 2000 to 3000 mg/liter for mature leaf bud cuttings of Ficus pumila L. IBA increased cambial activity, root initial formation, and primordia differentiation and elongation. IBA stimulated rooting when applied to juvenile cuttings at 3, 5, or 7 days after experiment initiation, but had no effect on mature cuttings when applied at day 15, the final treatment period. The interaction of IBA/gibberellic acid (GA3) did not affect early root development stages, but reduced root elongation and quality once primorida had differentiated. IBA/6-(benzylamino)-9-(2-tetrahydropyranyl)-9H-purine (PBA) inhibited rooting at early initiation stages.

Open Access

Abstract

Compared with manual pruning, use of fatty acid pruning compounds (Emgard, Off-Shoot-O and C-10) increased time to bloom for Rhodedendron obtusum Planch ‘Alaska’ and ‘Red Wing’ and decreased flower number on ‘Alaska’. Pruning compounds interacted with succinic acid-2,2-dimethylhydrazide (SADH) and (2-chloroethyl)triethylammonium chloride (chlormequat) as well as frequency of application in affecting date of bloom and number of flowers.

Open Access

Abstract

‘Shasta’ chrysanthemum (Chrysanthemum morifolium Ramat) showed less SO2-induced leaf necrosis than ‘Hurricane’. The growth retardant a-cyclopropyl-a-(4-methoxy-phenyl)-5-pyrimidine methanol (ancymidol) at 0.16 and 0.48 mg ai/2.5 cm pot reduced SO2 damage on both cultivars. There was positive correlation between stomatal activity (water diffusion resistance) and degree of leaf necrosis from SO2.

Open Access

Abstract

The effects of 2 light levels, (full sun and 47% shade) 3 nitrogen and 3 potassium levels (672, 2018, and 3362 kg/ha yr-1) on light compensation point, shoot and root growth, canopy distribution and leaf tissue nutrient content of Ficus benjamina were determined. The 47% shade treatment during 7 months of production significantly decreased light compensation point levels. N level slightly affected compensation point and K level had no effect. Higher N levels increased shoot growth, while K levels played a dominant role in root development. Light level interacted with both of these effects. N level was positively correlated to percent of the plant canopy contained in the upper half of the plant and this in turn closely was correlated with plant light compensation point.

Open Access

Abstract

Three container-grown woody ornamentals (Viburnum suspension Lindl., Podocarpus macrophylla Thunb., Pittosporum tobira Thunb.) showed increased height, stem caliper, shoot and root fresh weight when inoculated with either Glomus fasiculatus (Thaxter) Gerd. & Trappe or G. mosseae (Nich. and Gerd.) Gerd. & Trappe endomycorrhizae.

Open Access

Abstract

The effect of 0, 250, 1000, 3000, 5000, 7500, 10,000, and 15,000 ppm solution of NaCl:MgCl2 in a 10:1 ratio was determined on Chinese fan palms [Livistona chinensis (Jacq.) R Brown] grown in soil or nutrient solution. Plants grown in soil and drenched weekly with 10,000 ppm ceased growth within 2 months, while palms grown in nutrient solution exhibited a reduced growth rate with increasing salinity levels. Tissue analysis showed increased levels of Na and Mg in plant tissue with increased saline substrate levels, with highest Na and Mg tissue levels in fronds from container-grown palms.

Open Access

Abstract

Soil drench of (2-chloroethyl)phosphonic acid (ethephon) at 500 or 1000 mg (active ingredient)/25-cm pot, caused prostrate growth habit and fruit set on Ficus benjamina L. grown in full sun or 47% shade. Leaves of sun plants generally had a mesophyll with multiple palisade layers, while shade plants had only limited regions of multiple cells. Ethephon treatments reduced intercellular spaces in palisade and spongy mesophyll cells, particularly near leaf margins. High shoot/root ratios, reduced leaf area, and heavy leaf drop during an interior phase occurred with ethephon treatment, especially plants grown under full sun.

Open Access

Abstract

Leaf shine compounds applied to Ficus benjamina L. just prior to simulated shipment reduced their tolerance to low light stress as indicated by an increase in the light compensation point.

Open Access

Abstract

High N fertilization reduced percent infection by Glomus spp. (Glomus fasciculatus (Thaxter Gerd. & Trappe and G. mossae (Nich. and Gerd.) & Trappe) endomycorrhizae on inoculated Podocarpus macrophyllus Thunb., Pittosporum tobira Thunb., and Rhododendron simsii Planch. plants. Inoculation with Glomus spp. benefited growth of the 3 woody plant species even at high levels of fertilization (1250 N, 1250 K and 230 Mg kg/ha·yr−1) although leaf nutrients levels showed little difference from noninoculated plants.

Open Access