Crecimiento vegetativo, producción y calidad de las fibras en plantas de algodonero sometidas a estrés mineral

Potassium, like nitrogen, it constitutes an essential element for growth, development and production of cotton crops. Moreover, these elements are directly related to fiber formation and when provided in suitable doses, influences its quality. The aim of the experiments was to evaluate the influence of potassium on biometric parameters, yield and quality of cotton fibers. For this purpose, plants of the cultivar Delta opal were grown in a greenhouse with altered potassium fertilization, simulating K deficiency and two overdoses. During the different phenological stages, biometric variables were analyzed including the production of fibers and their qualitative parameters. The sub-dose and the overdoses treatments of K, changed all the evaluated parameters, demonstrating the importance of potassium fertilizer on them.

Problemática psicosocial y educacional de los niños marginados

The marginalized children’s psychosocial and educational issues, in this essay, are referred to the theoretical debate upon knowledge development and the possible solutions for those children.This issue will be addressed through the analysis of structures or forms of knowledge organization and from the necessary differentiation of social and individual cognitive development. Basedontheseobjectives, we will analyzethe classical theoriesrelated to cognitive developmentofdisadvantaged children, discussindividual andsocialcognitive developmentand, based on our empirical research, postulatean explanationforthese children’s cognitive development. Finally we will discuss and propose some educational solutions.