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- Author or Editor: M. N. Dana x
- HortScience x
Abstract
Highly significant correlations were found between seed no. and berry vol in 5 cultivars of cranberry, Vaccinium macrocarpon Ait. A formula is given for the calculation of vol from longitudinal and transverse berry diam.
Abstract
Exudate was extracted from ‘East Mailing (EM) I’, ‘EM IX’ and ‘EM XXV’ roots by applying an external vacuum to the cut surface of the trunk. ‘EM IX’ exudate failed to stimulate leaf disc expansion. GA-like substances were highest in ‘EM I’ and lowest in ‘EM IX’ exudate.
Abstract
Treatments with (2-chloroethyl)-phosphonic acid (ethephon) in the field initially caused green berries of cranberries (Vaccinium macrocarpon Ait.) to turn pink. Untreated berries increased in redness up to commercial harvest. Preharvest ethephon applications on mature, red berries caused no change in redness, but rather a decrease in yellowness, resulting in a change in hue, which may indicate a difference in relative amounts of the various pigments. Ethephon decreased the L reading of the berries, compared to the controls. Increasing the amount of water, in which the ethephon was dispersed, from 1.87 to 3.74 kliter/ha proved beneficial for coloring berries located deep in the vines not exposed to full sunlight. Ethephon treatments did not result in more rapid breakdown of the berries during storage. Only at extremely high rates of ethephon was berry size reduced. The commerci
Two native shrubs, Spiraea alba (meadowsweet) and Spiraea tomentosa (hardhack or steeplebush), have potential as landscape plants, but little is known about light requirements for these species. The performance of plants from four geographical seed sources of each species was evaluated in the field under six different light treatments: full sun; morning full sun; afternoon full sun; and 40%, 60%, and 80% shade. Provenance differences did exist for height, flowering, and leaf greenness. Growth, flowering, and canopy density were greater in full sun and 40% shade and least in 80% shade. Both species responded to shade with increased individual leaf area and higher specific leaf area. Relative leaf greenness decreased with shade in S. tomentosa but did not change in S. alba. Plants grown in morning or afternoon shade were shorter and smaller and had fewer inflorescences than did the full-sun plants. These species can survive in deep shade, but based on growth and appearance, they are best suited to full sun or light shade in the landscape.