Search Results
You are looking at 1 - 10 of 25 items for
- Author or Editor: Peter Hicklenton x
Abstract
Brickett isobutylidene diurea (IBDU), at 3.4 kg N/m3 in combination with either potassium muriate (KC1) or fritted potassium (K-frit) at 0.4 or 0.8 kg K/m3 in a sawdust-sphagnum peat medium, produced growth and visual quality in container-grown Juniperus horizontalis Moench cv. Plumosa Compacta equal to that of plants grown with weekly liquid fertilization (2.7 N and 2.2 g K/plant per week). Finer IBDU granules (ca 0.7 mm diameter) at either 1.7 or 3.4 kg N/m3 produced inferior quality plants and less seasonal growth. Tissue N remained fairly constant in 3.4-kg N/m3 brickett IBDU treatments throughout the season, but decreased steadily with both rates of fine granules. Tissue K was lower through the season with K-frit than with either a single (0.4-kg K/m3) or double (total 0.8-kg K/m3) application of K-muriate (KC1). Neither K rate nor source had a consistent effect on plant growth or quality over all sources and rates of IBDU.
Abstract
Overwintering under microfoam thermoblanket resulted in high poststorage quality of container-grown Cotoneaster Dammeri C. K. Schneid, and Juniperus chinensis L. ‘Pfitzerana-Aureo’ in USDA plant hardiness zones 5a and 6a (1). Similar results were obtained for J. chinensis overwintered under white copolymer in zone 5, but severe damage was sustained by C. Dammeri since the covering did not maintain media temperature above the lethal point for this species. Storage under clear copolymer at both locations caused foliage damage which was severe in C. Dammeri and moderate in J. chinensis. Black poly storage caused severe foliage damage in all J. chinensis and C. Dammeri. Viburnum cassinoides L. overwintered without serious damage in all treatments.
Abstract
Supplemental photosynthetically active radiation (PAR; 77, 148 and 231 μmol s-1m-2) was provided to Chrysanthemum morifolium Ramat ‘Paragon’ during 14 days each of rooting (24 hr daily), long days (LD; 24 hr daily) or short days (SD; 9 hr daily) in a greenhouse. Crop growth efficiency (calculated as the ratio of the observed to potential dry weight gain) was highest under the 77 μmol s-1 m-2treatment during each stage and decreased markedly at higher irradiances. Relative growth rates were increased by all levels of supplemental PAR at each stage. The increases were proportionately smaller than the increase in total PAR in treatments above 77 μmol s-1m-2. Flower number, and flower and vegetative dry weight increased in response to 77 μmol s-1m-2 supplemental PAR, but increased irradiances had no further effect. Extension of the 77 μmol s-1m-2 treatment beyond rooting to LD significantly improved all traits over single stage treatments. Further extension into SD, however, was not beneficial.
Leaf yellowing of Alstroemeria hybrida L. `Rio' and `Jacqueline', as measured by sphere spectrocolorimetry, was significantly delayed in vase life studies when the ends of cut stems were immersed in solutions of BAP or GA3 immediately following harvest. When BAP or GA3 was used alone at 50 mg·liter-1, foliage color and color intensity did not diminish during 14 days of storage in tap water. BAP and GA3 also showed interaction effects on leaf color, but little was gained by using combinations of chemicals. Chemical names used: 6N-benzylaminopurine (BAP); gibberellin (GA3).
Abstract
Chrysanthemum × morifolium Ramat cv. Paragon plants were grown under supplemental irradiation from high-pressure sodium lamps during rooting, long day (LD), and short day (SD) production stages in all combinations. Plants which were rooted under supplemental irradiation had higher relative growth rates (RGR) and dry weight increments during that stage than nonirradiated controls. Supplemental irradiation similarly increased RGR and dry weight increments during LD and 5 weeks of SD. Root, top, and total dry weights at the end of the SD irradiation period showed a residual incremental effect of the LD treatment. Percentage of increases in dry weight increments due to supplemental irradiation were quite consistent between stages, whereas treatments had a greater effect on RGR during rooting and LD than during SD. The number of days to final harvest was reduced by supplemental irradiation during rooting and LD. The numbers of flowering stem breaks per pot, mean stem break length, and total plant dry weight were increased by supplemental irradiation at each stage. Those effects principally were additive. Flower dry weight per plant was increased significantly only by LD treatment. The benefits of supplemental irradiation during each production stage, and of combined treatments, are discussed in relation to operating costs.
The rate of internodal extension of chrysanthemum (Dendranthema grandiflora Tzvelev. cv. Envy) under various temperature and photoperiod conditions was studied to determine whether reproducible diurnal patterns of growth existed and whether any such patterns conformed to an endogenous circadian rhythm. Stem growth was monitored continuously by means of linear displacement voltage transducers. At constant temperature and under 11 h light/13 h dark photoperiod, stem elongation followed a clearly defined pattern consisting of a peak in rate immediately after the dark to light transition and then a gradual decline until the start of the dark period. During darkness, elongation rate increased and reached a maximum approximately 8 hours after the light to dark transition. This pattern differed when light period temperature was either above or below dark period temperature, but these patterns were also highly reproducible. When plants were subjected to continuous light at constant temperature, the rhythm of stem elongation initially showed a periodicity of approximately 27 hours. After 2 or 3 diurnal cycles the rhythm was less distinct and the rate became essentially constant. Furthermore, the interruption of a long period of continuous light with a 13 h dark period did not restore the rhythm. These findings do not support the existence of an endogenous circadian rhythm of stem elongation. Diurnally-cued rhythms do, however, exist and can be modified by temperature.
The rate of internodal extension of chrysanthemum (Dendranthema grandiflora Tzvelev. cv. Envy) under various temperature and photoperiod conditions was studied to determine whether reproducible diurnal patterns of growth existed and whether any such patterns conformed to an endogenous circadian rhythm. Stem growth was monitored continuously by means of linear displacement voltage transducers. At constant temperature and under 11 h light/13 h dark photoperiod, stem elongation followed a clearly defined pattern consisting of a peak in rate immediately after the dark to light transition and then a gradual decline until the start of the dark period. During darkness, elongation rate increased and reached a maximum approximately 8 hours after the light to dark transition. This pattern differed when light period temperature was either above or below dark period temperature, but these patterns were also highly reproducible. When plants were subjected to continuous light at constant temperature, the rhythm of stem elongation initially showed a periodicity of approximately 27 hours. After 2 or 3 diurnal cycles the rhythm was less distinct and the rate became essentially constant. Furthermore, the interruption of a long period of continuous light with a 13 h dark period did not restore the rhythm. These findings do not support the existence of an endogenous circadian rhythm of stem elongation. Diurnally-cued rhythms do, however, exist and can be modified by temperature.
In northern regions, strawberry nursery plants are often dug in the late fall, packed and stored for winter, and shipped to markets in the early spring. Success depends on identifying when plants are dormant and can be safely stored. Beginning on 11 Oct., plants of Kent and Veestar were dug at weekly intervals from three fields in the Annapolis Valley, N.S., Canada. At each digging date root respiration was measured at 5, 10, 20 and 30°C. Six “first daughter” plants of each cultivar were wrapped in plastic and placed in ≈1.5°C refrigerated storage. Other plants were separated into roots and leaves for carbohydrate analysis. Fall temperatures were relatively mild with 417 crown chilling hours (8°C base) accumulated to 7 Nov. Only those plants dug on 11 Oct. did not survive when planted to the field on 1, June but vigor (number of daughters/runners) improved for plants dug later in the fall. For Kent, vigor increased through the last digging date (5 Dec.), but for Veestar, vigor did not change after 7 Nov. Early dug plants had relatively high rates of root respiration, low concentrations of leaf and root glucose, fructose, sucrose, and raffinose and high leaf starch, and low root starch concentrations. Most leaf sugar concentrations increased rapidly after 7 Nov., and root starch reached a maximum at the same date. Leaf and root carbohydrate concentrations were correlated with poststorage field vigor and may reflect the degree of plant dormancy at time of digging.