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Panayiotis A. Nektarios, Ioannis Amountzias, Iro Kokkinou and Nikolaos Ntoulas

a substrate must consist primarily of inorganic materials, whereas large quantities of composted or other organic substances should be avoided as a result of the substrate subsidence that results from their decomposition. Rowe et al. (2006

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Kristen L. McDowell*, Kevin Ong and Derald A. Harp

A study was conducted on the Texas A&M Univ.-Commerce campus to evaluate the effect of compost type on the spread of bermudagrass into rose garden beds. Roses were planted in an randomized complete-block design in beds amended with composts derived from yard waste, manure, poultry litter, or dairy manure, or an unamended control. The study site was free of vegetation prior to planting. No pre- or post-emergent herbicides were applied after planting. Each bed was assessed visually monthly and scored on a scale of 0 to 10, with each point equivalent to 10% coverage. A bed received a score of 10 upon full coverage. Beds amended with poultry litter and yard waste had significantly higher bermudagrass invasion and reached 100% coverage more quickly than other treatments. Some of the poultry litter beds reached 100% coverage within 40 days of planting. The control planting had significantly lower coverage than all compost treatments throughout the study.

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Helen T. Kraus, Robert L. Mikkelsen and Stuart L. Warren

Traditional N mineralization studies have been conducted by soil scientists using soils and temperatures found in field production. As temperature, in part, governs the rate of mineralization, and container substrates reach much higher temperatures than do soils, the effect of these elevated temperatures on mineralization must be considered to begin to understand N mineralization in container substrates during production. The N mineralization patterns of three composts [turkey (Meleagris gallopavo) litter, yard waste, and municipal waste] were determined under three temperature regimes (45, 25, and 45/25 °C). More organic N was mineralized from composted turkey litter (CTL) than from municipal or yard composts, regardless of temperature. The percentage of organic N mineralized from CTL was greater at 45/25 and 45 °C than at 25 °C.

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James W. Julian, Bernadine C. Strik, Handell O. Larco, David R. Bryla and Dan M. Sullivan

) to N ratio making plant fertility more difficult and expensive to manage with organic fertilizer products ( White, 2006 ). The use of compost as a mulch in blueberry may have advantages over sawdust. Compost has a lower C to N ratio and releases 3% to

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Nathan O. Nelson and Rhonda R. Janke

-based nutrient sources (e.g., crop residue, compost, manure) and nonprocessed mineral sources (e.g., rock phosphate, lime, gypsum). As such, nutrient management in organic production systems is fundamentally different from that in conventional systems. Phosphorus

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Handell Larco, Bernadine C. Strik, David R. Bryla and Dan M. Sullivan

in Years 3 to 5 ( Krewer et al., 2009 ). Compost may provide many benefits to blueberry production. As compost decomposes, it releases ≈3% to 10% of total N as mineral N for several years after the initial application ( Gale et al., 2006 ; Sikora and

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Lu Zhang and Xiangyang Sun

price of peat has resulted in the need for inexpensive organic alternatives as the growing media ( Eksi et al., 2015 ; Jayasinghe et al., 2010a , 2010b ). Researchers have previously considered the use of compost as a substitute for peat in the media

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Mark T.F. Highland*, Daniel C. Sclar, Elaine R. Ingham, Karen L. Gartley and James E. Swasey

Compost has great potential for use in horticulture; however, the relationship between compost feedstock materials and resultant compost characteristics must be well understood. Research examining plant growth response from the addition of compost to container growing media is limited. This research had two parts: the first part examined the relationship between compost feedstock materials and resultant mature compost characteristics. The second part investigated plant growth responses when compost replaced the peat component of container growing media. Two feedstock treatments were aerobically composted in turned windrows. Compost characteristics examined include pH, EC, C:N Ratio, Solvita Maturity, and several biological characteristics (total and active bacteria, total and active fungi, protozoa, spore forming bacteria, E. coli O157:H7, and total coliformic bacteria). To examine plant growth response, compost was substituted for peat (from 0%-40% by total volume) in container growing media. Crops tested were Antirrhinum majus `Rocket White', Viola × wittrockiana `Crown Azure', Oriental Hybrid Lilium `Siberia', and Chrysanthemum × grandiflorum `Yellow Kodiak'. Quantitative plant growth response measurements (shoot fresh and dry weight, percent root necrosis, flower number, and flower size) were recorded and compared by treatment. Despite initial feedstock differences between the two compost treatments, both resulted in similar compost biology and species richness. Coliformic bacteria and E. coli O157:H7 levels were below detection limits in final compost. Choice of compost feedstock materials had a significant effect on the chemical characteristics of the finished product. Compost replacement for peat resulted in plant growth greater than or equal to those of the control treatment.

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Dan TerAvest, Jeffrey L. Smith, Lynne Carpenter-Boggs, David Granatstein, Lori Hoagland and John P. Reganold

and Kirby, 2007 ; Kirby and Granatstein, 2009 ). Organic apple production uses compost and other organic fertilizers to supply nutrients to trees over the growing season. These organic sources are often considerably more expensive ( Granatstein and

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Brian A. Kahn, Niels O. Maness, Donna R. Chrz and Lynda K. Carrier

Compost use is becoming common in commercial vegetable production, particularly among smaller and more specialized producers ( Roe, 2001 ). Feedstocks for composts evaluated on vegetable crops have included mixed municipal solid waste, biosolids