Objective: Soil salinity is one of the major worldwide environmental constraints affecting agricultural production in arid and semiarid regions. Lack of proper management of water and soil resources lead to increase soil salinity and reduce soil fertility. On the other hand, it seems simple and cheap method of measuring soil salinity is necessary. The aim of this study was to determine the rela...

abstract cation exchange capacity (cec) is an important characteristic of soil in terms of nutrient and water holding capacities and contamination management. measurement of cec is laborious and time-consuming. therefore, cec estimation through other easily - measured properties is desirable. in this study, ptfs for estimation of cation exchange capacity from basic soil properties such as parti...

not available. Sat, Apr 22 10:15 0:35 Tom Ziegler The application of TDDFT to systems with a spin or space degenerate ground state Tom Ziegler, Mike Seth, and Fan Wang. Department of Chemistry, University of Calgary University Drive 2500, University of Calgary, 2500 University Drive, Calgary, AB T2N 1N4, Canada Ordinary time-dependent density functional theory (TDDFT) is not able to treat singl...

Spatial characterization of the variability of soil physico-chemical properties is a fundamental element of (i) soil quality assessment, (ii) modeling non-point source pollutants in soil, and (iii) sitespecific crop management. Apparent soil electrical conductivity (ECa) is a quick, reliable measurement that is frequently used for the spatio-temporal characterization of edaphic (e.g., salinity,...

the current research was carried out to find out the most effective environmental factors in plant species occurrence by classification and ordination methods. for this purpose, the study was conducted in nir rangelands of yazd province and topography, climate, soil and grazing intensity data of the region were determined. sampling method was randomized–systematic and within each sampling unit ...

Session I 9:30 – 10:45 AM Andrew Miles: Roanoke College Department of Philosophy Good, Evil and Well-being: Sam Harris’ Scientific Approach to Ethics One of the most controversial debates in ethics is how to define Good and Evil. Do “good” actions necessarily adhere to commandments set by a God? Or are there many different, equally valid definitions based on cultural norms? Neuroscientist and a...

growth and productivity of plants are mainly affected by various environmentalfactors in different ecosystems and natural habitat in the world. this research aims to studythe existing relationships between the phytosociology characteristics of thymuskotschyanus and environmental factors in order to find the most important factorsgoverning development of the species in middle taleghan rangelands...