ANALISIS KORELASI DAN JALUR DALAM PENENTUAN KRITERIA SELEKSI UBI JALAR (Ipomoea batatas (L.) Lam.) BERDAYA HASIL TINGGI

Abstract

CORRELATION AND PATH ANALYSES FOR DETERMINING THE SELECTION CRITERIA OF HIGH YIELDING SWEET POTATO (Ipomoea batatas (L.) Lam.)]. Sweet potatoes can be used as an alternative source of healthy carbohydrates. The productivity of sweet potato is relatively low, which was 13,51 tons/ha. To breed the potato plants one of the solutions to develop superior varieties. The success of plant breeding is determined by the success of the selection activity, one of which is determined by the selection characters used. Correlation and path analysis are used to study the closeness of the quantitative variables as the basis for a more efficient selection program. The purpose of the research was to determine the selection character of sweet potato and to study the correlation pattern between the observed characters based on the correlation coefficient value along with the direct and indirect effect. The research was carried out on dry land with Inceptisol soil type, at an altitude of 350 m above the sea level and arrange a randomized block design with three replications. The material used thirteen sweet potato genotypes. The results of the correlation analysis showed that the tuber yield had a very strong and positive correlation to the number of plants (r = 0.706), the fresh weight of tuber (r = 0.816), and dry weight of tuber (r = 0.898), while the tuber number had a moderate positive correlation. (r = 0.605). Several variables also showed a negative relationship, including stover fresh weight, % of tuber dry weight, dry weight of stover, and dry weight of biomass. Based on the correlation and path analysis, the variable of tuber dry weight can be used as an effective and efficient selection character in order to produce the high yield of sweet potatoes.