Distancia entre plantas y dosis de nitrógeno y potasio en sandía sin semillas fertirrigada

El objetivo de este trabajo fue evaluar los efectos de dosis de N y K2O, vía fertirrigación por goteo, y de la distancia entre plantas sobre la productividad del híbrido Shadow de sandía sin semillas. El experimento se realizó de agosto a octubre de 2008 en el Município de Tupã, SP, Brazil. Se avaluaran cuatro dosis de N + K2O (79,8 + 106,7, 106,4 + 142,2, 133,0 + 177,7, y 159,6 + 213,2 kg ha-1, respectivamente), y cuatro distancias entre plantas (0,5, 1,0, 1,5 y 2,0 m), en hileras espaciadas de 2,0 m. Se utilizó el diseño experimental de bloques al azar, en parcelas subdivididas, con tres repeticiones. Las variables evaluadas fueron: concentración foliar de N y K, peso medio de frutos, número de frutos y productividad total y comercial; y número de frutos en las clases de 3 a 5, 5 a 7, 7 a 9 kg y con más de 9 kg, por planta y por hectárea. Hubo efecto del factor dosis de N + K2O sobre la concentración foliar de K, y la productividad total y comercial de la sandía híbrido Shadow disminuyó linealmente con el aumento de la distancia entre plantas. Sin embargo, no hubo efecto significativo de la interacción ni efecto individual de los factores sobre las otras variables avaliadas.

Percepción de estudiantes de odontología sobre educación a distancia

Introduction: distance education is defined as a learning mode in which pedagogical and didactic mediation in teaching and learning processes is characterized by the use of information and communication means and technology by both teachers and students, and the development of educational activities at different settings and technologyand. Objective: evaluate the knowledge obtained by students from the last year of Odontology about distance education and their opinions about the subject. Methods: across-sectional descriptive exploratory study was conducted. Of the total 140 university students, 120 participated in the study. A self-applied questionnaire was developed with questions related to the student, the use of the Internet and distance education. The professional updating alternatives included were graduate courses and subscription to newspapers. Results: 29.2 % of the students use the Internet on a daily basis; only one student stated that he did not use the Internet. Of the students interviewed, 63.34 % did not know any form of distance education. As a consequence, 97.5 % had never taken part in a distance education course and 62.5 % stated that they did not know whether they would. Conclusions: results show that odontology students are prejudiced against nontraditional learning modes, though they use the Internet on a regular basis. Despite the existence of legislation regulating distance education, students are still concerned about its quality and legality.