Study of the Method for Determining Sampling Number for Root Investigation
Root system was in the main location for changing the substance and energy between plant and environment, and its distribution reflects the utilization of the plants to the environment. With the development of the science and technology, the study of the root also tend to shift from the qualitative to the quantitative, among which the scientific method for investigation was the key to quantitative study. Based on the data of the root investigation,the number of sampling points needed for root investigation by soil auger was calculated and analyzed by mathematical statistics method. And the results showed that the root investigation should be carried out on different sites and sampling area. Considering the needs of the investigation and the actual condition, the number of sampling points in different sampling area was determined, and some improvement was made to the 1/4 circular sampling method.
The aim of this study is to find the solutions of quality improvement for selected leading universities in the North of Vietnam. The authors collected data from parents, staffs, government officer, industrial experts, etc. This study used Likert scale of five. From the results of hypotheses, the author found the relationships among variables. Based on that point of view, the author proposed general recommendations for university and leaders and the suggestion for each stakeholder in education. In terms of important findings, finding dimensions and analyzing their relationships contribute to the evaluation of educational quality in North of Vietnam.