Author: James Bruce CalkinsPublisher:
ISBN:
Category :
Languages : en
Pages : 476
Book Description
Effects of Conventional and Alternative Nursery Field Management Systems on Chemical and Physical Soil Characteristics and on Tree Growth and Development
Author: James Bruce CalkinsJournal of Environmental Horticulture
Author: Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 774
Book Description
Weed Technology
Author: Agronomy News
Author: Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 832
Book Description
Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Graduate School Commencement
Author: University of Minnesota. Graduate SchoolPublisher:
ISBN:
Category :
Languages : en
Pages : 88
Book Description
Soil Physical and Chemical Property Effects on Toxicity and Bioaccumulation of as (V), Cd, Pb, and Zn by Herbaceous Plant Receptors
Author: Richard Hunter AndersonPublisher:
ISBN:
Category : Herbs
Languages : en
Pages : 76
Book Description
Abstract: Soil properties can mitigate hazardous effects of environmental contaminants through soil chemical sequestration and should be considered when evaluating ecological risk from terrestrial contamination. The objective of this research was to identify predominant soil chemical/physical properties that modify phytoaccumulation and phytotoxicity of As (V), Cd, Pb, and Zn to the non-hyperaccumulating higher plants; Alfalfa (Medicago sativa L.), Perennial ryegrass (Lolium perenne L.), and Japanese millet (Echinochloa crusgalli L.) and model effects with statistical prediction equations. Bioassays were conducted on five artificially contaminated experimental soils that ranged in selected chemical/physical properties. Soil properties selected for characterization included organic C (OC), pH, cation exchange capacity (CEC), clay content, and amorphous oxides of iron (Fe), aluminum (Al), and manganese (Mn). Phytotoxicity and phytoaccumulation parameters were estimated from dose-response experiments for each contaminant-plant-soil combination. Significant statistical associations were found between each endpoint and a subset of the selected soil properties for all four contaminants. However, significant intercorrelation was observed among soil property measurements which necessitated an alternative to conventional multiple regression commonly used by ecotoxicologists. Ridge regression, a technique that suppresses the effects of multicollinearity and enables prediction, was used to assess the marginal contributions of each mitigating soil property. In general, Ridge regression results suggested that OC, clay content, and soil pH, collectively, or CEC, individually, best described trends in phytoaccumulation and phytotoxicity for the cationic metals. Conversely, Ridge regression results suggested that soil pH and the Fe oxide fraction were usually the most important properties found to mitigate As phytoaccumulation and phytotoxicity. An additional objective was to evaluate differential contaminant sensitivities of the experimental plants that were used in the dose-response experiments as inter-species variability can limit the utility of statistical models used to predict the effects of soil properties on phytotoxicity of terrestrial contaminants. We, therefore, present a novel approach to toxicity estimation (the Plant Contaminant Sensitivity Index) that partitions the effect of differential sensitivities of test organisms from that of soil properties. The proposed normalization procedure is simply illustrated and is intended to be used as a means to integrate toxicity information from different studies with multiple test species.
Advances In Nutrient Dynamics In Soil - Plant System For Improving Nutrient Use Efficiency
Author: R. ElanchezhianPublisher: New India Publishing Agency
ISBN: 9385516965
Category : Technology & Engineering
Languages : en
Pages : 4
Book Description
This book comprises 31 chapters on advances in soil-plant systems for improving nutrient use efficiency with four major themes viz. 1. Introduction and Fundamentals of Soil Plant Atmosphere Continuum and nutrient use efficiency 2. Soil physical, chemical, biological and agronomic management for improving NUE 3. Plant physiological, genetic & molecular biological basis for improving nutrient uptake & use efficiency 4. Climate change aspects related to soil and plant systems for improving NUE. Besides the book also include few chapters on analytical techniques and instrumentation for the study of nutrient use efficiency with respect to physico-chemical and biological parameters.
Tree Planters' Notes
Author: The Effects of Organic Amendment on Tree Growth in Compacted Soil
Author: Angela A. RivenshieldPublisher:
ISBN:
Category :
Languages : en
Pages : 336
Book Description