Search Results
Abstract
The influence of indolebutyric acid (IBA) and succinic acid-2,2-dimethyl-hydrazide (SADH) on the adventitious root formation of 4 species of woody plants was investigated at concns of 1000, 2500, and 5000 ppm applied as a 15 sec basal dip. At both the 5000 and 2500 ppm levels of IBA, Ilex cornuta Lindl. cv. ‘Burfordii’ and Juniperus horizontalis Moench. cv. ‘Plumosa’ responded with greater adventitious root formation than any of the SADH treatments. Increased adventitious root formation in Cupressus arozonica Greene, was observed only at the 5000 ppm level of IBA. Pinus strobus L. did not respond to any of the treatments.
Abstract
Root penetration of Euonymus data (Thunb.) Siebold ‘Compactus’ through a peat-soil (1:1 v/v) medium and into an unamended mineral soil increased as medium density increased from 1.3 to 1.8 g/cm3. Root penetration was decreased at all medium densities across a glazed interior medium-soil interface.
Abstract
Some horticulturists may regard Liberty Hyde Bailey as the father of American horticulture. Perhaps, this accolade is better reserved for Thomas Jefferson, our nation’s 3rd president, who not only wrote the Declaration of Independence, but also penned the words, “the greatest service which can be rendered any country is, to add a useful plant to its culture” (1).
Abstract
Fluctuations of macronutrient levels in the leaves, stems and roots were analyzed in Cotoneaster dammeri, C. K. Schneid, cv. Royal Beauty and Juniperus horizontalis, Moench cv. Piumosa during the overwintering period. Potassium, Mg and Ca levels, in both species, maintained periods of relative stability. Tissue P levels remained stable in all tissues, while Ν levels in leaves, stems and roots of both species fluctuated significantly throughout the sampling period.
Abstract
Many individuals view the need to deliver an occasional paper at a national meeting as an occupational hazard of their profession. Others take the more optimistic view that the presentation of a paper not only presents an opportunity to assist others, but also offers an excellent means to accelerate one’s career and argue that as much attention should be given to the presentation (both oral and written) as was given to the actual research. There is more at stake than one’s own reputation; after all, in an oral presentation you are holding your colleagues captive.
Abstract
Four herbicides formulated as slow release tablets were evaluated for weed control on container grown nursery crops. These included alachlor (2-chloro-2, '6'-diethyl-N-(methox-ymethyl) acetanilide), metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl) acetamide), oxadiazon (2-tertbutyl-4(2,4 dichloro-5-isopropoxyphenyl)-∆2-1,3,4-oxadiazoIin-one) and oryzalin (3,5-dinitro-N4,N4 dipropyl-sulfanilamide). Metolachlor tablets at 40 Kg/ha exhibited 120 days of excellent weed control. Less injury was evident on border forsythia (Forsythia intermedia Zab. “Spectasbilis’) and cranberry cotoneaster (Cotoneaster apiculatux Rhed. & E.H. Wils) when herbicide applications were made using tablets in comparison to equivalent rates of granular material.
Abstract
Granular and tablet formulations of EPTC (S-ethyl dipropylthiocarbamate), alachlor (2-chloro-2’, 6’-diethyl-N-(methoxymethyl)acetanilide) and metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl)acetamide) were evaluated for leaching characteristics in nursery containers. The tablet formulations generally controlled the release rate of the herbicides so leaching was not a major problem. Granular formulations of the same herbicides readily leached through the medium. EPTC did not release at a favorable rate from the tablet formulation.
Abstract
The United States has a rich and varied heritage. Beginning with the early settlements of Jamestown, Va., Plymouth, Mass., and St. Augustine, Fla., we have been influenced by a great diversity of climates, natural resources, ethnic populations, and foreign inputs. These influences and their products are well-documented in the traditional artifacts collected in museums: art, furniture, craftwork, and impliments. In communities across this nation many old buildings have been restored and furnished with the help of existing historical records. The desire for accuracy in such an undertaking extends to a need for historically accurate landscaping as well as architecture and furnishings. Horticultural restoration is of increasing interest and concern.
Abstract
Leaf tissue carbohydrates of Ilex opaca cv. ‘Miss Helen’ extracted with alcohol and methylated with trimethylchlorosilane (TMCS) and hexamethyl-disilizane (HMDS) were assayed by gas chromatography. This empirical procedure involved a one-hour refluxing of 1 g of air dried plant tissue in 80% ethanol, followed by taking 2 ml of the alcoholic extract to dryness at 70°C. Upon dryness the material was taken up with 0.25 ml anhydrous pyridine, and methylated with 0.1 ml of TMCS and 0.1 ml of HMDS. After 30 min of reaction time a 2 µl portion of the mixture was assayed by gas chromatography. Five carbohydrates, D-fructose, D-galactose, alpha-D-glucose, beta-D-glucose and sucrose were identified. These carbohydrates extracted from the plant tissue were of a soluble nature. No apparent starch or cellulose hydrolysis was observed as a result of the extraction procedure. Reagent grade carbohydrates were observed to anomerize during the extraction procedure, however no indication of this phenomenon was noted with the plant tissue. Recovery was in the order of 90% with good associated reproducibility.
Abstract
Seed germination was 90–95% for Kentucky coffeetree [Gymnocladus dioicus (L.) C. Koch] after concentrated sulfuric acid treatment for 120 to 150 minutes; 97–98% for honeylocust (Gleditsia triacanthos va. inermis L.) following 60, 90, or 120 minutes concentrated sulfuric acid scarification; and was 67–72% for redbud (Cercis canadensis L.) after 30, 60, or 90 minutes of concentrated sulfuric acid scarification followed by a 60-day stratification period. Scanning electron micrographs of acid-scarified Kentucky coffeetree, honeylocust, and redbud seed indicated that lumens of the macrosclereid cells on the seed surface were exposed after acid treatment, permitting imbibition of water. Boiling water treatment ruptured the macrosclerid layer, while seed treated with liquid N2 had fissures that did not appear to penetrate the macrosclereid layer.