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Felix Ponder Jr., James E. Jones, and Joan Haines

Annual applications of N, P, and K fertilizers were broadcast for 4 years around black walnut trees (Juglans nigra L.) in an upland plantation to determine their effect on nut production and foliar nutrient levels. Fertilization significantly (P = 0.05) increased nut production, treatments containing P with N and/or K being most effective. Doubling the rate of application did not produce a corresponding yield in nuts. Increases in leaf concentrations of N, P, and K were associated with increasing treatment levels of these elements. Levels of all elements tested, except P, were above deficiency levels. The modest gain in production suggests that soil fertility was not a major factor limiting nut production for trees in this study.

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Saadat Sarikhani Khorami, Kazem Arzani, Ghasem Karimzadeh, Abdolali Shojaeiyan, and Wilco Ligterink

specifically nut crops is the major constraint for breeders ( van Nocker and Gardiner, 2014 ). One of the basic strategies for reducing the length of breeding cycle is the introduction of superior genotypes. Moreover, germplasm screening of fruit trees in

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Mark V. Coggeshall

CURRENT LIMITATIONS ON BLACK WALNUT PRODUCTION In 1955, there were 10 nut cracking plants specializing in black walnut nutmeat production, capable of processing 27.2 million kilograms of dried in-shell nuts, yielding 3.3 million kilograms of edible

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Michael W. Smith

were adequately thinned. An objective of this study was to determine the maximum cropload ‘Pawnee’ trees in this study could carry and return a similar crop the next year. In addition, selected nut quality characteristics were correlated with cropload

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David Rietow

Botanical Gardens, and Walter Hill, superintendent of Brisbane’s Botanical Gardens. The nut was named in honor of Mueller’s good friend, John Macadam, a prominent scientist, philosopher, and politician. The macadamia tree, a subtropical evergreen of the

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Lenny Wells

did not increase orchard productivity, nut yield, or quality. Wood (2009) suggested that moderate-width (2.4 m from the tree axis), short-cycle (annual or biennial pruning) mechanical hedging did not appear efficacious for southeastern pecan

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Norio Takada, Sogo Nishio, Masahiko Yamada, Yutaka Sawamura, Akihiko Sato, Toshio Hirabayashi, and Toshihiro Saito

, 2009 ). Japanese chestnut differs from Chinese chestnut in morphological characteristics such as nut size, leaf shape, and hair density on young leaves ( Woodroof, 1979 ). Japanese chestnut cultivars are believed to have been developed from wild

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Reza Amiri, Kourosh Vahdati, Somayeh Mohsenipoor, Mohammad Reza Mozaffari, and Charles Leslie

Persian walnut ( Juglans regia L.), widely cultivated for nut production, is an ancient species ( Fjellstrom and Parfitt, 1994 ; Vahdati, 2000 ) originating in areas of Central Asia, including Iran. Wild trees of this species are widely dispersed

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Sogo Nishio, Masahiko Yamada, Norio Takada, Hidenori Kato, Noriyuki Onoue, Yutaka Sawamura, and Toshihiro Saito

sources of food and construction materials. Even now, they are commercially grown throughout Japan for food, and chestnut orchards covered more than 21,400 ha in 2011, ranking fourth among woody fruit and nut crops in Japan after citrus, apple, and

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Donald J. Garrot Jr., Michael W. Kilby, Delmar D. Fangmeier, Stephen H. Husman, and Andrew E. Ralowicz

, equipment, and financial support; and Santa Cruz Valley Pecan Co., Sahuarita, Ariz., for assistance with the collection of nut quality data for the duration of this research. The cost of publishing this paper was defrayed in part by the payment of page