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Donald J. Merhaut, Eugene K. Blythe, Julie P. Newman, and Joseph P. Albano

Release characteristics of four types of controlled-release fertilizers (Osmocote, Nutricote, Polyon, and Multicote) were studied during a 47-week simulated plant production cycle. The 2.4-L containers containing a low-fertility, acid-based substrate were placed in an unheated greenhouse and subjected to environmental conditions often used for production of azaleas and camellias. Leachate from containers was collected weekly and monitored for pH, electrical conductivity, and concentrations of NH4 + N, NO3 N, total P and total K. Leachate concentrations of all nutrients were relatively high during the first 10 to 20 weeks of the study, and then gradually decreased during the remaining portion of the experiment. Differences were observed among fertilizer types, with Multicote often resulting in higher concentrations of N, P, and K in leachates compared to the leachates from the other fertilizer types during the first half of the study. Concentrations of NO3 and P from all fertilizer types were often above permissible levels as cited in the federal Clean Water Act.

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Pengpeng Duan, Ying Sun, Yuling Zhang, Qingfeng Fan, Na Yu, Xiuli Dang, and Hongtao Zou

). Soil mineral N [including nitrate (NO 3 − )–N and ammonia (NH 4 + )–N], soil soluble organic N, soil microbial biomass N, and soil fixed ammonium are important labile soil N fractions that are actively involved in N mineralization and immobilization

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Zhao Xiang, Zhu Huisen, Gao Yang, and Li Deying

salinity when fertilized with nitrate than with ammonium. Similar results were reported for roses ( Rosa hybrida ) ( Lorenzo et al., 2001 ) and wheat ( Triticum aestivum L.) ( Irshad et al., 2002 ). Ehlting et al. (2007) reported that gray poplar

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M. Lenny Wells

management, pecan tree response to N has been variable in multiple studies throughout the years ( Hunter and Lewis, 1942 ; Smith et al., 1985 ; Storey et al., 1986 ; Worley, 1974 , 1990 ). Ammonium nitrate and urea are the most common forms of dry N

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David R. Bryla and Bernadine C. Strik

the primary nutrient applied to blueberry and is required each year. Unlike most crops, blueberry acquires primarily the ammonium (NH 4 ) form of N over NO 3 -N, due to low nitrate reductase activity in the roots and leaves ( Merhaut and Darnell, 1995

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Mohammed B. Tahboub, William C. Lindemann, and Leigh Murray

times and the effect of three wood chip applications one time. Pecan wood chips were incorporated (disking to 10 cm) in May 2002, June 2003, and May 2004. The inorganic N (ammonium sulfate) treatment (N1) included rates of N at 15.2, 30.5, 45.7, and 61

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M. Lenny Wells

following treatments were evaluated: 1) emitter-adjacent application of liquid UAN (28N–0P–0K) with 5% S; 2) broadcast application of dry ammonium nitrate (34N–0P–0K); 3) broadcast-band application of dry ammonium nitrate; 4) broadcast ground

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Ugur Bilgili, F. Olcay Topac-Sagban, Irfan Surer, Nejla Caliskan, Pervin Uzun, and Esvet Acikgoz

available nutrients in sewage sludges. The color of turfgrass produced from composted-sewage sludge amendments was comparable to that of turfgrass fertilized with ammonium nitrate ( Angle, 1994 ; Markham, 1998 ). Moreover, if turfgrass receives adequate

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Bielinski M. Santos

with urea, ammonium nitrate (AN), and calcium nitrate. Other research suggested that total marketable fruit yield did not vary because of preplant applications of sulfur-coated urea, AN, and urea in strawberry ( Albregts et al., 1991b ). Santos and

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M. Lenny Wells

+ poultry litter; 4) ammonium nitrate; and 5) untreated control (2009 to 2011). Treatments were arranged in a randomized complete block design using six replications. Blocks were arranged with each treatment represented once per block. Each plot consisted of