ARBORICULTURE ARBORICULTU & CONTENTS URBAN FORESTRY Volume 37, Issue 6, November 2011 Formerly the Journal of Arboriculture, 1975 – 2005 (Volumes 1 – 31) www.isa-arbor.com Nicole R. Polakowski, Virginia I. Lohr, and Teresa Cerny-Koenig Survey of Wholesale Production Nurseries Indicates Need for More Education on the Importance of Plant Species Diversity ......................................................................................... 259 Abstract. Recent pest outbreaks, such as emerald ash borer and Asian longhorned beetle, have renewed concerns about the lack of genetic and species diversity in landscapes across the United States. However, the level of understanding of these issues by people in the green industry is not known. A survey on the knowledge of plant species diversity issues was distributed to Washington, U.S., wholesale nurseries. Respondents indicated a general awareness of the issue, but they had insufficient understanding of why the lack of species diversity is a problem. Respon- dents who had learned about plant species diversity in educational settings beyond high school were more likely than others to understand the issues. These results indicate the need for increased, in-depth education on why plant species diversity among landscape plants is important. Key Words. Biodiversity; Genetic Diversity; Nurseries; Overplanting. Wayne A. Geyer Evaluation of Ponderosa Pine Seed Sources for Windbreaks in the Central Great Plains of the United States ..................................................................................................................... 265 Abstract. Ponderosa pine (Pinus ponderosa Laws.) has been planted widely in the Great Plains of the United States for windbreaks. Rec- ommendations based on a 1968 study were to use material from south central South Dakota and north central Nebraska. A second test to further delineate seed sources (provenances) in this region was established in 1986. This paper reports results for survival, height, diame- ter, and D2 H measurements in both Kansas and South Dakota, aſter 15 years. Results identify a wide range of suitable geographic provenances within the two-state region. A majority of the tested sources performed well in both states, thus verifying the original recommendations. Key Words. Growth Characteristics; Pinus ponderosa; Ponderosa Pine; Provenance; Seed Source; Tree Selection; Windbreaks. Bryant C. Scharenbroch, William Treasurer, Michelle Catania, and Vincent Brand Laboratory Assays on the Effects of Aerated Compost Tea and Fertilization on Biochemical Properties and Denitrification in A Silt Loam and Bt Clay Loam Soils .................... 269 Abstract. Aerated compost tea (ACT) is gaining interest as a nutrient amendment for urban trees. This study examined the effects of ACT, synthetic fertilizer, and deionized water on 15 biochemical properties with two soil types. Significant effects for pH, Mg2+ , Na+ N, and C/N ratio were not observed among treatments. No differences between dilute ACT (ACTd) at 22.4 kL ha-1 Soil K+ Soil K+ dissolved organic N, microbial biomass N, and N mineralization were greater with fertilizer compared to ACT. Increases in denitrifica- tion were seen with ACTc , NH4 was greater with ACT concentrate (ACTc) at 224 kL ha-1 +, and microbial respiration were greater with ACTc Minor improvements in soil fertility were observed with ACTc, and denitrification losses were lower with ACTc izer; Urban Trees. with fertilizer at hours 48 and 96 (+65 to +127 mg N2O kg-1 compared to 30-10-7 fertilizer at 195 kg N ha-1 compared to water in A soils. Soil P (A soils only), NO3 compared to fertilizer and water in the first 24 hours (+4 to +12 mg N2O kg-1 , C, and water were detected. with A horizon soils. - (Bt soils only), ), but greater increases were observed ). Greatest improvements in soil fertility were observed with fertilization. compared to the fertilizer. Key Words. Compost Extract; Microbial Activity; Microbial Biomass; Nitrous Oxide; Nutrient Availability; Organic Fertilizer; Synthetic Fertil- ©2011 | International Society of Arboriculture | ISSN:1935-5297
November 2011
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