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Y.L. Grossman and T.M. DeJong

Plant dry matter production is proportional to light interception, but fruit production does not always increase with increased light interception. Vegetative growth potential, the effect of cropping on vegetative growth, light interception and cropping efficiency of a clingstone peach [Prunus persica (L.) Batsch `Ross' on `Nemaguard' rootstock] were assessed in four production systems differing in tree density and training system. The four systems were a perpendicular V (KAC-V) system, a high-density perpendicular V (HiD KAC-V) system, a cordon system, and an open vase system. Vegetative growth potential, assessed on defruited trees, was higher in the cordon system and lower in the open vase system compared to the V systems. Cropping reduced leaf growth on the V and cordon systems and stem growth on the KAC-V and cordon systems. On a ground area basis, the HiD KAC-V system had the highest crop yields and the open vase system had the lowest. The cordon and HiD KAC-V systems intercepted more light and produced more fruit, stem, and leaf biomass than the open vase system. However, the modified harvest increment, the ratio of fruit dry mass to the sum of fruit, leaf, and stem dry mass, was lower in the cordon system than in the other systems. Thus, on this basis, the cordon system was the least efficient. On a trunk cross-sectional area basis, there were no significant differences in fruit production among any of the four training systems. For current year production, crop production per unit ground area is the best measure of economic efficiency. However, when planning the spacing, training and pruning of orchard trees, the most appropriate goal seems to be a system that increases light interception without increasing vegetative growth potential, such as the HiD KAC-V system.

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Carolyn F. Scagel, Guihong Bi, Leslie H. Fuchigami, and Richard P. Regan

cultivars, suggesting that new stem and leaf growth on these cultivars after May is a function of N uptake and remobilization before May. Our results are important examples of when basing fertilizer recommendations on the rate of plant growth, it is

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T.J. Tworkoski, D.M. Glenn, and W.V. Welker

Carbohydrate and nitrogen were measured during 1992 and 1993 in shoots of peach [Prunus persica (L.) Batsch.] trees that were planted in 1989 and grown in three vegetation-free areas contained within plots planted to tall fescue (Festuca arundinacea Schreber), orchardgrass (Dactylis glomerata L.), or a mixture of Lolium perenne L. and Festuca rubra L. Trees grown in 9.3-, 3.3-, and 1.5-m2 vegetation-free areas had the greatest to the least fruit yield, respectively. Fruit number and mass were negatively correlated with stem mass. Grass type had little effect on mass, carbohydrate, or N partitioning within the tree. Individual sugars and carbohydrate partitioning were not affected by grass competition. In contrast, the proportion of shoot N partitioning into stem and leaves declined markedly as the size of the vegetation-free area increased. Proximity of peach trees to grass may have limited N uptake, which, in turn, reduced fruit yield but not stem and leaf growth.

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Laban K. Rutto, Myong-Sook Ansari, and Michael Brandt

significant ( P ≤ 0.05) impact on all parameters measured in season 2 with higher stem and leaf growth, and dry matter production recorded with increasing N availability. The opposite was observed for root dry matter that declined at higher N levels. A

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suffers from excessive stem and leaf growth during forcing in the home. Miller and Finan (p. 294 ) observed that 4% to 5% ethanol, applied as the irrigation solution after plants are about 2-3 inches tall, yielded a compact plant with no adverse effects

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David C. Zlesak

intermediate. Podosphaera aphanis var. physocarpi only infects ninebark (the others are generalists), and plants infected with this fungal species often display witches’ brooms covered in mycelium (i.e., thickened, stunted stem and leaf growth at the

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William B. Miller and Madeline W. Olberg

.i. per pot) on Narcissus growth and development. Stem and leaf growth increment refers to the difference between the lengths at first flower and the end of flowering. Expt. 2: Ethephon spray concentration and volume. Similar to the above experiment

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William B. Miller, Neil S. Mattson, Xiaorong Xie, Danghui Xu, Christopher J. Currey, Kasey L. Clemens, Roberto G. Lopez, Michael Olrich, and Erik S. Runkle

per treatment. Results Expt. 1: Ethephon drenches on Narcissus at Cornell. There were few differences between the two experiments, so data were pooled for the final analysis. Ethephon drenches reduced stem and leaf growth across most Narcissus

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

additional stem and leaf growth and will henceforth be termed as a plant. Approximately 1 month before treatment, four cranberry plants were transplanted into a single clay pot (15 cm diameter, 15 cm long), which was the experimental unit. Pots were

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Christopher J. Currey and Roberto G. Lopez

availability and preferential allocation into roots over stem and leaf growth. Currey and Lopez (2012) reported that under higher DLIs, Impatiens hawkeri ‘Magnum Salmon’ allocated more carbon to root growth preferentially over stems and leaves. We observed