abstract in order to study the effects of salinity and silicon application on biomass of leaves and root of purslane (portulaca oleracea l.), a greenhouse experiment was conducted at research greenhouse of ferdowsi university of mashhad using completely randomized desgin with three replications. employed two factors consisted of three levels of salinity using nacl (0.6, 11, 22 ds/m) and two lev...

The literature data method and logic analysis are used to study the basic concepts of course content, textbook content teaching their similarities differences, reveal relationship interconnection joint construction among three. research suggests that integrates subject knowledge, methods processes, skills, values, experience. All three based on student-centered have consistent value pursuit. Ho...