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Susan C. Miyasaka, Jeff B. Million, Nguyen V. Hue, and Charles E. McCulloch

. Meisner, H.P. Stene, D.T. Matsuyama, and C.A. Ritch for their assistance in soil preparation, establishment and maintenance of avocado seedlings, grafting, data collection, and data entry. Also, we thank C.K. Miura of the Univ. of Hawaii–Hilo for her

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Elvis A. Takow, Edward W. Hellman, Andrew G. Birt, Maria D. Tchakerian, and Robert N. Coulson

establishment guided, in part, by a feasibility study conducted by Texas A&M University ( Perry and Bowen, 1974 ). The study systematically analyzed the state for climate, soils, water availability, and risk factors; many of these factors were summarized with

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Lamprini Tassoula, Maria Papafotiou, Georgios Liakopoulos, and Georgios Kargas

plant ( Sage, 2001 ) and includes laticifers that contribute to its defense against herbivores ( Fineran et al., 1988 ). It prefers calciferous and alkaline soil, full sun, good drainage, and it sprouts up in rocky coastal areas; it is cold hardy to −9

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Sharon J.B. Knewtson, Rhonda Janke, M.B. Kirkham, Kimberly A. Williams, and Edward E. Carey

( Knewtson et al., 2010 ). Variety and fertility trials in high tunnels in Kansas, Missouri, and Nebraska began in 2002 ( Jett, 2004 ; Kadir et al., 2006 ; Zhao et al., 2007 ). However, the effect that cropping under high tunnels has on soil quality is

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Laura Guazzelli, Frederick S. Davies, and James J. Ferguson

Our objectives were to determine the effects of leaf N concentration in citrus nursery trees on subsequent growth responses to fertilization for the first 2 years after planting and the impact of N fertilizer rate on soil NO3-N concentration. `Hamlin' orange [Citrus sinensis (L.) Osb.] trees on `Swingle' citrumelo rootstock [C. paradisi Macf. × P. trifoliata (L.) Raf.] were purchased from commercial nurseries in Apr. 1992 (Expt. 1) and Jan. 1993 (Expt. 2) and were grown in the greenhouse at differing N rates. Five months later, trees for each experiment were separated into three groups (low, medium, and high) based on leaf N concentration and were planted in the field in Oct. 1992 (Expt. 1) or Apr. 1993 (Expt. 2). Trees were fertilized with granular material (8N-2.6P-6.6K-2Mg-0.2Mn-0.12Cu-0.27Zn-1.78Fe) with N at 0, 0.11, 0.17, 0.23, 0.28, or 0.34 kg/tree per year. Soil NO3-N levels were determined at 0- to 15- and 16- to 30-cm depths for the 0.11-, 0.23-, and 0.34-kg rates over the first two seasons in Expt. 2. Preplant leaf N concentration in the nursery varied from 1.4% (Expt. 1) to 4.1% (Expt. 2) but had no effect on trunk diameter, height, shoot growth and number, or dry weight in year 1 (Expt. 1) or years 1 and 2 (Expt. 2) in the field. Similarly, fertilizer rate in the field had no effect on growth during year 1 in the field. However, trunk diameter increased with increasing N rate in year 2 and reached a maximum with N at 0.17 kg/tree per year but decreased at higher rates. Shoot number during the second growth flush in year 2 was much lower for nonfertilized vs. fertilized trees at all rates, which had similar shoot numbers. Nevertheless, leaf N concentrations increased during the season for trees with initially low levels, even for trees receiving low fertilizer rates. This suggests translocation of N from other organs to leaves. Soil NO3-N levels were highest for the 0.34-kg rate and lowest at the 0.11-kg rate. Within 2 to 3 weeks of fertilizing, NO3-N levels decreased rapidly in the root zone.

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W.G. Harris, M. Chrysostome, T.A. Obreza, and V.D. Nair

government, and important quality of life items (like food!). However, Florida's high water tables and/or sandy soil textures in conjunction with vulnerable surface and groundwater present challenges to sustainable horticulture. Optimizing horticultural

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Javier Fernandez-Salvador, Bernadine C. Strik, and David R. Bryla

regarding fertilizer options suited for use in fertigation systems. The objectives of this study were to 1) determine the impact of two organically approved liquid fertilizer sources applied through fertigation on plant growth, yield, fruit quality, and soil

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Shawna Loper, Amy L. Shober, Christine Wiese, Geoffrey C. Denny, Craig D. Stanley, and Edward F. Gilman

resulting in significant disturbance to soils. Studies have shown that urban soils often lack natural soil horizons ( Jim, 1998 ), are significantly compacted ( Gregory et al., 2006 ; Jim, 1998 ), can have alkaline pH ( Jim, 1998 ; Law et al., 2004 ), and

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Michael Fidanza, Derek Settle, and Henry Wetzel

et al., 2005 ; Smith et al., 1989 ). Fairy ring symptoms observed in a turfgrass stand are the result of a complex interaction between the basidiomycete-causing fungus and the soil root zone and turfgrass thatch ( Fidanza, 2015 , 2007b ; Fidanza et

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Marco Bittelli

Soil water content has an important impact on many fundamental biophysical processes. It affects the germination of seeds, plant growth and nutrition, microbial decomposition of the soil organic matter, nutrient transformations in the root zone, as