Sweet potato yield evaluation trials

• Main Authors: Dimyati A, Minantyorini, Zuraida N
• Format: Book
• Language: English
• Published: 1992
• Subjects: clone; clones; crop yield; ensayos de variedades; essai de variete; evaluacion; evaluation; ipomoea batatas; java; rendement des cultures; rendimiento de cultivos; variety trials

A series of yield evaluation trials were conducted in Kuringan, Bogor, and Garut, West Java as well as Salatiga, Central Java. Forty-two clones derived from an open-pollinated population involving various superior parental clones were tested in a preliminary trial in Kuningan Experimental Farm. In the advanced trials, two sets of nine clones were tested in Kuringan and Salatiga, fourteen were tested in Bogor and another set of nine was tested in Garut. Yields of 30 t/ha or more were given by 29 clones out of 42 tested in Kuningan. However, only two clones gave higher yields than cultivars Prambanan and Citok used as check. No yield differences were observed in the advanced yield trial in the farmer's field in Kuningan. All but two clones tested in Salatiga were significantly outyielded by the local cultivar. Exceptionally low yield was observed in the experiment in Bogor, where only three clones gave similar yields to those of improved and local cultivars. Uneven pattern of yield at different locations indicated the presence of significant genotype by environment interaction. This urges the breeder to modify the procedure of sweet potato breeding to utilize the phenomenon to the advantage of the farmers by conducting earlier stages of selection in various locations representing different edaphoclimatic conditions instead of conducting multilocational trials involving a few clones. Previous yield evaluation data supported the idea.