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Grace A. Chrustic and Robert D. Wright

Abstract

Rooted cuttings of Ilex crenata Thunb. ‘Helleri’, Rhododendron obtusum Planch. ‘Rosebud’, and Juniperus chinensis L. ‘San Jose’ were grown in a 100% pine-bark medium amended with dolomitic limestone at 0 to 8 kg m-3 with resulting pH from 3.4 to 7.2. Except for juniper at 2 kg m-3, growth was not increased by liming, and 8 kg m-3 tended to reduce shoot and root growth. This reduced growth was attributed in part to greater NH4 adsorption by the bark, reducing the amount available for plant uptake, and a higher nitrification rate, leading to an elevated NO3 to NH4 ratio in the medium. Liming pine bark to improve growth of these woody plants may be unnecessary.

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James E. Altland and M. Gabriela Buamscha

lime sources on DFB pH as well as nutrient availability with respect to changes in substrate pH. Materials and Methods Expt. 1. On 20 June 2006, pH of 13 batches of DFB (each 0.03 m 3 ) was adjusted using 13 rates of either calcium

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Jinsheng Huang, Paul R. Fisher, and William R. Argo

Liming materials are incorporated into container substrates to neutralize acidity and to provide calcium (Ca) and magnesium (Mg). Liming materials differ in their reactivity rate, which in turn determines the proportion of base that remains as

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James E. Altland, M. Gabriela Buamscha, and Donald A. Horneck

determine the influence of elemental sulfur (S) and two lime sources on DFB pH, nutrient availability with respect to changes in substrate pH, and if relationships between pH and nutrient availability in DFB alone are similar to DFB amended with peatmoss and

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Orapin Kerdchoechuen, Natta Laohakunjit, Sasathorn Singkornard, and Frank B. Matta

. tenuiflorum L.), two species of Rutaceae : Kaffir lime ( Citrus hystrix DC), and lime ( C. aurantifolia Swingle), and clove ( Eugenia caryophyllus L.); and 2) determine the effectiveness of the extracted essential oils in controlling the maize weevil

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Richard J. Henny and Jianjun Chen

cultivars were released previously ( Henny and Chen, 2001 ; Henny et al., 1992 , 2003 , 2008 ) by the Foliage Plant Breeding Program at the Mid-Florida Research and Education Center in Apopka, FL. Aglaonema ‘Key Lime’ is the newest named cultivar to be

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Alexander X. Niemiera, Linda L. Taylor, and Jacob H. Shreckhise

and pH increased ( Elliott, 1988 ). Peat treated with four lime rates over 28 d had complete hydrolysis within 4 d and hydrolysis rate was higher as substrate pH increased ( Vetanovetz and Peterson, 1990 ). Seventy-one percent of applied urea was

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Paul R. Fisher, Jinsheng Huang, and William R. Argo

Limestone is incorporated into horticultural substrates to neutralize substrate acidity, increase pH buffering capacity, and provide calcium and magnesium. Limestones differ in their rate of pH change, equilibrium pH, and proportion of unreacted “residual”? lime. In horticulture, lime reactivity is currently measured empirically in batch tests, whereby limestone is incorporated into a batch of substrate and pH change is measured over time. Our objective was to develop a quantitative model to describe reaction of lime over time. The lime reaction model predicts the substrate-pH based on lime acid neutralizing capacity, lime type (calcitic, dolomitic, or hydrated), lime particle size distribution, application concentration, and the non-limed pH and neutralizing requirement (buffering) of the substrate. Residual lime is calculated as the proportion of lime remaining following gradual neutralization of the substrate acidity (by subtraction of reacted lime from total applied lime).

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James E. Altland and Kay Yeon Jeong

substrates to between 5 and 6.5, a range that is thought to be most conducive for growth of most plants. The two primary limestone products used in agriculture include calcitic lime [calcium carbonate (CaCO 3 )] and DL [CaMg(CO 3 ) 2 ]. Pure dolomite has

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Sara Atrash, Asghar Ramezanian, Majid Rahemi, Reza Mostofizadeh Ghalamfarsa, and Elhadi Yahia

vitro and on Mexican lime fruit. Moreover, the effectiveness of SEO on maintaining the appearance and internal quality of Mexican limes was compared with gum arabic edible coating, and hot water treatments. Material and Methods Extraction and analysis of