For efficient selection of grain yield, like the most importance economic trait, in regard to its on the great influence the environmental factors, has complex mode of inheritance and low heritability, is necessary to know genotypic and phenotypic coefficient of correlations between grain yield and morphological traits of the plant and ear which are influencing on the grain yield. The objective of this paper was to determine relationship between grain yield and morphological traits, in 8 inbred lines and their hybrids. Strong genetic and phenotypic correlations were found between grain yield and other studied traits, except between grain yield, on one side, and kernel row number where we found medium correlations. Between other studied traits, the highest values of genotypic and phenotypic coefficient of correlations were found between ear length and cob weight

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Modern performance measurement systems include customer satisfaction as an important performance indicator. From the standpoint of the Higher Education Institution (hereinafter HEI) in Serbia, key performance indicators are quality indicators used to assess the current situation; to identify service failures and to take on service recovery; to improve total quality of the institution and to determine the future development of the institution. In increasingly competitive and dynamic educational environment, the management of a HEI is aware of the importance of student satisfaction in the context of student motivation and retention, recommendations to potential freshmen, recruiting efforts and funding, as well as performance management. There are numerous direct and indirect indicators of student satisfaction. The main objective of this paper is to identify the parameters of educational process and non-teaching support that have the greatest impact on student satisfaction. Data analysis, conducted in this paper, provide information on the degree of student satisfaction and possible improvements in this area. This study uses standard and hierarchical regression to examine possible causes of student satisfaction. It is based on answers of 1541 students of the College of Professional Studies – Belgrade Polytechnic, collected during a four-year research.

Studies on genetic gains in grain yield and other traits may be very useful in providing necessary information to plant breeders about the effectiveness of their breeding programs. The objective of this research was to analyze changes in grain yield, yield stability and morphological characteristics of maize hybrids released in Serbia between 1978 and 2011. Five hybrids, representatives of different breeding periods, were chosen for this study. Field trials were conducted during 2013 and 2014 at three locations in Serbia. The estimated genetic gain per breeding period was 440 kg ha -1 which corresponds to an approximate annual linear increase in yield of 63 kg ha -1 . Changes in morphological characteristics were presented graphically, compared to the reference value and defined by the third period of breeding. Plant and ear height, kernel row number, number of kernels per row and leaf number were reduced compared to the third breeding period. Kernel depth showed higher variation through periods while in other analyzed traits, major changes in value through the periods were not found. Stability analysis distinguished the hybrids from the sixth and seventh period of breeding as the most stable, whereas the most unstable were representatives of the fifth and third period. Changes in certain morphological traits and yield stability have led to an increase in the genetic potential of the hybrids most probably through the increased tolerance to biotic and abiotic stress factors.