Production weight and its variability in 24 apricot genotypes over six years

Abstract

Productivity and its stability were evaluated in a set of 24 apricot genotypes of the world collection and some promising new selections in [1994][1995][1996][1997][1998][1999]. The productivity of most genotypes was higher than that of control variety Velkopavlovická LE-6/2. Genotypes with higher productivity in the years favorable for apricot productivity gave higher yields also in the years unfavorable for productivity. It was proved by a significantly close highly significant correlation (r = 0.64 ++ ). It is a reason for the necessary regulation of fruit set in highest-yielding varieties in the years favorable for apricot productivity when overproduction and undesirable reduction in the fruit size occur. The variability of yields in kg per tree, expressed by coefficients of variation over a six-year period, was high in the years of observation. The variability of yields was significantly lower in the years favorable for apricot productivity. To express yield variability the coefficient of variation and index of fluctuation can be used. Their similar conclusiveness was proved by the significant positive closeness of correlation between the values determined by both calculations (r = 0.51 + ). The varieties Vynoslivyj and Volšebnyj showed the highest and most stable productivity. From the producer's and breeder's aspects, of these two the Vynoslivyj variety is one of the most remarkable genotypes of the evaluated set due to its fruit quality and late ripening. number. Selected crosses (hybrids) are designated by working numbers where the letters LE and M indicate the origin from the Faculty of Horticulture at Mendel University of Agriculture and Forestry at Brno -Lednice. Velkopavlovická LE-6/2 variety was used as control. New genotypes (designated by abbreviations M, LE, LE-SEO and numerals) were included in the experimental orchard because they were interesting after previous evaluations from the producer's aspect. The other varieties were used for a comparison on the basis of evaluation and recommendation of foreign institutions that provided these varieties for this experiment. KeywordsTrees were planted in a long block design: five plants of each genotype were set out. Each tree was evaluated individually. Out of the originally planted 93 genotypes only those genotypes were included in final evaluation whose number of plants did not decrease below three trees by the end of experiment (1999) and whose values of all studied traits were complete in all years. The number of genotypes that could be evaluated decreased to 24. This set was evaluated in the present paper. Commercially important yields were produced from the fourth year after planting. Productivity was not regulated by fruit thinning during the six-year period of evaluation.Even though the long-term values of average annual temperatures are favorable for the experimental locality (9.0°C), there were significant differences between the years in the course of temperatures particularly in the blooming period. Four years in the period of ob...

Specific productivity of selected apricot genorypes

“…Even though long-term data on average temperatures and rainfall are favorable for the experimental locality and evaluated fruit-tree species (9°C, 526 mm), the particular years showed significant differences in temperature course and rainfall sums in the blooming period, which resulted in productivity fluctuations. The characteristics and detailed description of weather conditions, temperature variations and rainfall and their risks in particular years of the period of observations are given in another paper (VACHŮN 2002).…”

Biological properties of late-season apricot cultivars in the Belgrade region

“…Dobijeni rezultati o prinosu su u skladu sa rezultatima Vachůn-a (2002a). On je proučavao rodnost kod 24 sorte kajsije u periodu od šest godina i utvrdio variranje prosečnog prinosa od 3-20 kg po stablu.…”

Phenology, production and fruit quality of new Czech apricot cultivars in the Belgrade region

“…Dobijeni rezultati o prinosu su u skladu sa rezultatima Vachůn-a (2002a). On je proučavao rodnost kod 24 sorte kajsije u periodu od šest godina i utvrdio variranje prosečnog prinosa od 3 do 20 kg po stablu.…”