mechanical and physical properties to the cell walls of this stock type. Taken together, the micropropagated plants reached significantly higher values for 13 traits (32.5%), primarily associated with the relative proportion of Glc and the macromolecular
Jaroslav Ďurkovič, František Kačík, Miroslava Mamoňová, Monika Kardošová, Roman Longauer and Jana Krajňáková
Susan L. Barkley, Jonathan R. Schultheis, Sushila Chaudhari, Suzanne D. Johanningsmeier, Katherine M. Jennings, Van-Den Truong and David W. Monks
content and similar yields to Beauregard ( La Bonte et al., 2008 ). A second objective of this research was to compare chemical and physical properties (color, texture, DM, and sugar content) and consumer acceptability of ‘Evangeline’ and ‘Covington
Jennifer Moore-Kucera, Anita Nina Azarenko, Lisa Brutcher, Annie Chozinski, David D. Myrold and Russell Ingham
, because nutrient cycling is largely driven by microbial functioning. These fractions are considered more responsive to changes in C inputs compared with measurements using total SOM. Table 1. Soil biological, chemical, and physical properties to be
Linda L. Taylor, Alexander X. Niemiera, Robert D. Wright and J. Roger Harris
result of the acidifying nature of peat. The objective of this work was to determine the effects of storage time on PTS chemical and physical properties and on plant growth. Specifically, the effect of storage on PTS pH, EC, CEC, C:N, particle size
Christopher Y. Choi, Werner Zimmt and Gene Giacomelli
Aqueous foam was developed to serve as a barrier to conductive, convective, and radiative heat transfer. Through the use of a bulking agent, the physical properties of gelatin-based foam were more stable, adhesive, biodegradable, and long lasting. The phytotoxicity, possible environmental hazard and removal of the foam were also considered. Resistance to freezing-thawing, heating-evaporation, and wind were evaluated. Studies to determine the foam's long-term stability under field weather conditions were completed. The handling and performance characteristics of the foam necessary for development of this application were determined. Factors that affect the physical properties and the utilization of the foam were quantified. These included the proportions of the foam components, the mixing temperature of the prefoam solution, the application temperature, and the rate of foam generation. The newly developed foam might be ideal for freeze and frost protection in agriculture.
Maria Papafotiou, Niki Pergialioti, Lamprini Tassoula, Ioannis Massas and Georgios Kargas
Quality Assurance Organization (FCQAO), 1994 ] by the methods of Peech (1965) and Bower and Wilcox (1965) , respectively. The physical properties of the substrates were determined after 48 h saturation. Samples were prepared by the methods described in
Lamprini Tassoula, Maria Papafotiou, Georgios Liakopoulos and Georgios Kargas
characteristics. Physical and chemical properties of the substrates and their components ( Fig. 2 ; Tables 1 and 2 ) were measured in three samples, which were mixed and taken as one measurement. The physical properties were determined after saturating for 48 h
Brian E. Jackson, Amy N. Wright and Jeff L. Sibley
In the southeastern United States, inconsistent pine bark (PB) supplies and overabundance of cotton gin by-products warrant investigation about the feasibility of replacing PB with cotton gin compost (CGC) for container horticultural plant production. Most research on the use of composted organic substrates for horticultural plant production has focused on shoot growth responses, so there is a need to document the effect of these substrates on root growth. In 2004, `Blitz' tomato (Lycopersicon esculentum), `Hot Country' lantana (Lantana camara `Hot Country'), and weeping fig (Ficus benjamina) were placed in Horhizotrons to evaluate root growth in 100% PB and three PB:CGC substrates containing, by volume, 60:40 PB:CGC, 40:60 PB:CGC, and 0:100 PB:CGC. Horhizotrons were placed in a greenhouse, and root growth in all substrates was measured for each cultivar. Physical properties (total porosity, water holding capacity, air space, and bulk density) and chemical properties (electrical conductivity and pH) were determined for all substrates. Physical properties of 100% PB were within recommended guidelines and were either within or above recommended ranges for all PB:CGC substrate blends. Chemical properties of all substrates were within or above recommended guidelines. Root growth of all species in substrates containing CGC was similar to or more enhanced than root growth in 100% PB.
Dennis B. McConnell and Wayne H. Smith
Three foliage plants, Dracaena fragrans, Peperomia obtusifolia and Schefflera arboricola were grown in 24 different mixes. Potting mixes were formulated using yard waste compost from two sources, a commercial mix (Metro 300) and a prepared mix (peat: pine bark sand). All potting mixes produced acceptable plants with no phytotoxicity associated with any mix. Only minor differences were discerned in the growth rate of P. obtusifolia and S. arboricola.
The growth rate of D. fragrans showed the greatest response to potting mix formulations. Plants in a standard potting mix (P/PB/S) used in the industry for D. fragrans grew slower than plants in many of the mixes containing various fractions of yard waste compost. Chemical and physical properties of the potting mixes used showed physical properties had the greatest variability. Overall, the best growth for all 3 plants was in a potting mix composed of 87.5% Metro 300/12. 5% YWC#1 and worst growth was in YWC#2 (100% composted (live oak leaves).
Gray R. Bachman
The horticulture industry continues to show interest in using stabilized organic wastes as a component of container media. Vermicompost, also known as worm-worked waste or worm castings, is one of these materials of interest and can be produced from a number of organic wastes, including manure wastes. One issue that has not been addressed is the uniformity of vermicomposts produced from wastes of different sources. Are all vermicomposts created equal? The uniformity of vermicompost is important for growers to consider when using as a medium amendment. This research project investigated the physical properties of vermicompost 1) from different sources of wastes and 2) from a single waste source sequentially sampled over time. The first stage determined the physical properties of vermicompost from beef manure, hog manure, and peat-based media used by two earthworm growers. There were significant differences between the four vermicomposts in bulk density, air volume, percent air volume, percent volumetric moisture, total porosity, and water holding capacity. The second stage involved determining the physical characteristics of vermicompost produced from beef manure collected at the Illinois State University Research Farm from cattle receiving a consistent diet through the year. Manure was collected bimonthly. There was no difference in vermicompost bulk density among the samples. There were significant differences in air volume, percent air volume, percent volumetric moisture, total porosity, and water holding capacity. These changes in vermicompost physical characteristics must be quantified for growers to accurately predict performance as a growth medium amendment.