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Frank Kappel

Yield components of 8- to 10-year-old trees were compared among `Kieffer' [Pyrus communis (L.) x Pyrus pyrifolia (Burro.)] and `Harrow Delight' and `Harvest Queen' [Pyrus communis (L.)]. `Kieffer' set more fruit than the other cultivars, even though flower density was similar. `Kieffer' also had similar size or larger fruit than `Harrow Delight' or `Harvest Queen'. Path analysis showed that the direct and indirect effect of fruit number on yield was important for all cultivars. Flower density only had a small direct effect on yield and this was at times negative. Fruit size had a small effect on yield when compared to fruit number.

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P.A. Bowed and W.M. Kliewer

Yield components responsible for yield variation within and among three `Cabernet Sauvignon' grape (Vitis vinifera L.) clones in a cane-pruned vineyard were determined over 2 years using a multivariate analysis procedure, two-dimensional partitioning (TDP). TDP analysis indicated that canes were producing at their capacity and yield per vine was limited by the number of canes retained. Yield per cane was limited by the portion of nodes at which shoots developed, and yield per shoot was limited by cluster number and fruit-set. The highest-yielding clone bore more fruit on non-cane shoots and fewer and larger clusters on cane shoots than the moderate-yielding clone. Poor fruit-set exhibited by the lowest-yielding clone resulted from inadequate or inviable pollen. In one year, thicker canes were more productive than thinner canes due to better bud burst and fruit set.

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P.A. Bowen and W.M. Kliewer

Two-dimensional partitioning of variation was used to determine the sources of relationships between the yield and vegetative characteristics of three `Cabernet Sauvignon' grape (Vitis vinifera L.) clones. Clonal differences were found in shoot growth rate, but not in duration or total growth. A weak positive relationship between total shoot growth and yield resulted from a positive relationship between fruit set and growth duration. Relationships between cluster number and foliar characteristics indicated that light exposure in the previous year may have influenced both vegetative and reproductive development. The mean number of clusters per bud was positively related to the mean area, dry weight, and nitrogen content of leaves.

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Teryl R. Roper and Marianna Hagidimitriou

Carbohydrate concentration may be important for flower initiation and fruit set in cranberry (Vaccinium macrocarpon Ait.). Fruit set has been shown to be a major limiting factor in yield component analysis. The objective of this research was to identify carbohydrate concentrations in cranberry tissues at various stages of development under field conditions. Samples of two cranberry cultivars, `Stevens' and `Searles' were collected during the 1989 season using a 13 cm diameter probe. Samples were divided into fruit, uprights, woody stems and roots. Carbohydrates were quantified by HPLC. Nonstructural carbohydrates were primarily sucrose, glucose, fructose and starch. Soluble carbohydrate concentration was stable throughout the season in tissues analyzed, while starch content was high early in the season then decreased during blossom and fruit set. This work shows that starch reserves in leaves and stems apparently are remobilized to support fruit set in cranberry.

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David S. de Villiers and Robert W. Langhans

Protein is an important and essential dietary component. Common bean, a major source of vegetable protein in the Americas, was chosen for study in controlled environments with a view to its potential for use in space colonies. Eighteen 0.58-m2 stands of the cranberry type of bean, `Etna', were grown in the greenhouse at plant densities of 7, 15, and 28 plants/m2 in a recirculating ebb-and-flow system. Duration of photoperiod and thermoperiod was 16 h. Day/night temperatures settings were 25/20 °C. Daily light integral was matched across greenhouse sections by means of supplemental lighting; it averaged 17 mol/m2 per day. Crop cycle was 70 days from seed to harvest. At harvest, plants were dismembered so that dry weights of leaf, branch, stem, pod, and bean yields could be separately measured by node of origin. Internode lengths were recorded, and all loose trash recovered. The relationship between yield and plant density followed the form expected. Yield of edible biomass at 7 plants/m2 (284 g/m2) was 88% of that at 28 plants/m2 (324 g/m2), a significant difference. At 15 plants/m2 it was 97%. The trend suggests that further gains (but only very small) in yield can be expected with increased density in this cultivar. Productivity and quantum yield at 28 plants/m2 were 4.69 g/m2 per day and 0.27 g/mol, respectively. The coefficient of variation for plants grown at 28 plants/m2 was three times that of plants grown at 7 plants/m2 (0.88 vs. 0.26). Yield component analysis, harvest index, and plant morphology at the different planting densities are discussed.

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Kent D. Kobayashi

Pulse, and Urban Ag News. Handouts covered terminology for systems analysis, growth analysis, and yield-component analysis. Grower Talks, Greenhouse Grower, and Hawaii Landscape were some of the popular works publications, and scientific articles of

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David L. Ehret, Brenda Frey, Tom Forge, Tom Helmer, and David R. Bryla

2011 and 44%, 39% and 40% for the same treatments in 2012). Although yield component analysis was not attempted, nor was it the intention of the study, it is likely that plant size, fruit size, and the numbers of flower buds all contributed to final

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Rizwan Maqbool, David Percival, Qamar Zaman, Tess Astatkie, Sina Adl, and Deborah Buszard

. 108 520 522 Glass, V.M. Percival, D.C. Proctor, J.T.A. 2005 Tolerance of lowbush blueberries ( Vaccinium angustifolium Ait.) to drought stress. I. Soil water and yield component analysis Can. J. Plant Sci. 85 911 917 Ismail, A.A. Smagula, J

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M. Joseph Stephens, Peter A. Alspach, Ron A. Beatson, Chris Winefield, and Emily J. Buck

series expansion ( Dieters et al., 1995 ). Yield component analysis. Before analysis, NFRT was converted to NFRT per centimeter of lateral and NBUD converted to NBUD per centimeter of cane, which enabled the product of all components to approximate total

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Katherine M. Ghantous, Hilary A. Sandler, Wesley R. Autio, and Peter Jeranyama

on development of the terminal bud of the cranberry Can. J. Plant Sci. 52 273 279 Eaton, G.W. Kyte, T.R. 1978 Yield component analysis in the cranberry J. Amer. Soc. Hort. Sci. 103 578 583 Eck, P. Childers, N.F. 1966 Blueberry culture. Rutgers Univ