Citrus Research Report 1990
ABOUT THE COLLECTION
The Citrus Report, first published in 1978, is one of several commodity-based agricultural research reports published by the University of Arizona. The purpose of the report is to provide an annual research update to farmers, researchers, and those in the agricultural industry. The research is conducted by University of Arizona and USDA-ARS scientists.
Both historical and current Citrus Reports have been made available via the UA Campus Repository, as part of a collaboration between the College of Agriculture and Life Sciences and the University Libraries.
Other commodity-based agricultural research reports available in
the UA Campus Repository include:
Cotton
Reports |
Forage
& Grain Reports |
Sugarbeet
Reports |
Turfgrass
Reports |
Vegetable
Reports
QUESTIONS?
Contact CALS Publications at pubs@cals.arizona.edu, or visit the CALS Publications website.
Contents for Citrus Research Report 1990
- Hydrogen Cyanamide Trial, 1984/1985
- Hydrogen Cyanamide Trial on Table Grapes, 1985/1986
- Gibberellic Acid Sizing Trial on Table Grapes, 1987
- Gibberellic Acid Sizing Trial on Table Grapes, 1988
- Gibberellic Acid Sizing Trial on Table Grapes, 1989
- The Response of Table Grape Growth, Production, and Ripening to Water Stress
- Phosphorus Response in Wine Grapes
- Response of Grape Cultivars to Nitrogen and Phosphorus
- Effects of Gypsum Applications on Established Thompson Seedless Grapes
- Phymatotrichum (Cotton Root Rot) Resistant Grape Rootstocks
- Control of Variegated Leafhopper, Erythroneura variabilis Beamer, By Insecticides
- Control of Variegated Grape Leafhoppers by Insecticides
- Photosynthetic Acclimation of Leaves of Three Apple Cultivars as Affected by Growth Under Full Sun or 85 Percent Shade and Subsequent Transfer to the Contrasting Light Regime
- Scheduling Apple Irrigations with Infrared Thermometers
- Consumptive Water Use in High Density Apples
- Control of Phytophthrowa Root and Crown Rot of Apple Trees
- Root and Crown Rot of Apple Trees Caused by Phytophthora
- Internal Bark Necrosis in Southeastern Arizona Apples
- Annual Weed Control in Apples -- Spring Valley Farms 1984-85
- Jojoba Harvesting Equipment
- Evaluation of Pyrenone and a Detergent for Jojoba Scirtothrips ewarti bailey Control
- Control of Jojoba Looper by Insecticides
- Evaluation of Insecticides and Oils for Jojoba Scirtothrips ewarti bailey Control
- Insects Affecting Commercial Jojoba Production in Arizona
- Pistachio Rootstock Evaluation
- Seasonal Nutrient Content of Pistachio Leaves in Arizona
- Quantification of Pecan Water Stress for Irrigation Scheduling
- Effects of Various Chemicals on Dormancy, Maturity and Thinning of Peaches
- Effect of Nitrogen Application on Growth and Photosynthetic Nitrogen use Efficiency in Two Ecotypes of Wild Strawberry, Fragaria chiloensis (L.) Duchn
- Deciduous Fruit Variety Planting at the U of A Citrus Station, Maricopa County
- Extension Fruit and Nut Program Report for Mohave County
- Deciduous Fruit Trees at the Tucson Extension Garden Center
- Fruit and Nut Tree Variety Trial -- Yuma
- Chill Hour Assessment for the Yuma Area
- Helicopters and Frost Prevention: A Preliminary Evaluation
Recent Submissions
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Effect of Nitrogen Application on Growth and Photosynthetic Nitrogen use Efficiency in Two Ecotypes of Wild Strawberry, Fragaria chiloensis (L.) DuchnThe relationships between increasing nitrogen fertilization and growth, maximum CO₂ assimilation and the initial slope of the CO₂ response curve were studied in two ecotypes of wild strawberry, Fragaria chiloensis (L) Duchn. Nitrogen accumulation of CA11, an ecotype from a low -nutrient dune site, was greater at all nitrogen concentrations than that of RCP37, an ecotype from a higher- nutrient strand site. Maximum CO₂ assimilation, total Rubisco activity, dry weight, and initiation of leaves and crowns were higher in CA11 than RCP37 as nitrogen treatment was increased from 0 to 200 mg l⁻¹, whereas these parameters were lower in CA11 when fertilized at 300 mg l⁻¹, but not in RCP37. The mean leaf area of CA11 was greater than RCP37 when grown with no supplemental nitrogen, but mean leaf area of the two lines was similar under nitrogen fertilization. Maximum CO₂ assimilation and carboxylation efficiency increased with increasing leaf nitrogen in both clones. At equivalent concentrations of leaf nitrogen, RCP37 had higher CO₂ assimilation and carboxylation efficiency than CA11 and the difference between the 2 clones increased as leaf nitrogen increased. Thus, RCP37 had a higher photosynthetic nitrogen use efficiency than CA11. However, at a given applied nitrogen level, CA11 allocated more nitrogen to a unit of leaf area so that photosynthetic rates were higher than RCP37, except at the highest application of 300 mg l⁻¹. The high nitrogen accumulation capacity and resource allocation to fruiting structures (crowns) in CA11 lead us to suggest that this clone may possess genes that could increase fruit yield in cultivated strawberry.
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Effects of Various Chemicals on Dormancy, Maturity and Thinning of PeachesEffects of 5 chemicals on the reduction of dormancy and early maturity of peaches were studied for 3 years under the desert climatic condition of Southwest Arizona. CuSO4, urea and particularly hydrogen cyanamide reduced the dormancy and enhanced blooming. Application of hydrogen cyanamide in October induced full bloom in November (1 month after application) and produced fruit. Late November was the most appropriate time for application of hydrogen cyanamide, and fruit were harvested 10 days before normal time in April. No difference was found between 5% and 3% (V/V) of hydrogen cyanamide in the time of blooming; however, rate at 5% always caused some phytotoxicity. Application of hydrogen cyanamide at 1% before bloom and at full bloom produced the same size of commercially packed fruit as hand-thinned ones.