Agronomic performance and drought tolerance level of sweet potato hybrids grown in Kupang, East Nusa Tenggara, Indonesia

Abstract

Abstract. Mau YS, Ndiwa ASS, Markus JER, Arsa IGBA. 2019. Agronomic performance and drought tolerance level of sweet potato hybrids grown in Kupang, East Nusa Tenggara, Indonesia. Biodiversitas 20: 2187-2196. This study was conducted to evaluate agronomic performance and to assess drought tolerance level of purple and orange-fleshed F1 sweet potato hybrids in dryland during dry season in Kupang, East Nusa Tenggara. The study was carried out in Integrated Archipelagic Dryland Field Laboratory of Universitas Nusa Cendana, Kupang, from May to October 2018. Two sets of experiment were conducted, the first was for evaluation of agronomic performance, and the second was for evaluation of drought tolerance of the sweet potato genotypes. The first experiment assessed the agronomic performance of 20 sweet potato genotypes in a Randomized Block Design. The second experiment employed a Split Plot Design consisted of irrigation level as the main plot and sweet potato genotypes as subplot treatments. The main plot consisted of no stress (normal) and water-stressed conditions while the sub-plot comprised of 20 genotypes of the sweet potato. The observed agronomic performance variables included growth and yield parameters. Tuber yields in no stress and water-stressed conditions were observed and used for assessment of drought tolerance. The results showed that, in the agronomic performance experiment, the sweet potato genotypes differed significantly in all the observed agronomic performance variables including growth, yield contributing, and yield variables. UNC2016.Cil/JPV.01 and UNC2016.Cil/JPV.05 were short maturing genotypes with only about 90 days to harvesting while the rest of the genotypes were harvested in 120 to 150 days. The genotypes were also significantly varied in tuber yield; the highest was observed in UNC2016.JPV/KDL.11 (43.38 t ha-1). In the drought tolerance evaluation experiment, tuber yields in no stress and stressed condition were, respectively, 23.42 t ha-1 and 7.08 t ha-1. Six F1 hybrids were classified and selected as drought-tolerant genotypes with high yielding performance in both no stress and water-stressed conditions.

Screening of some sweet potato (Ipomoea batatas (L.) Lam) genotypes for yield and damage by Cylas puncticollis under rainfed conditions in Umudike, Southeastern Nigeria

“…All of these findings suggest that the genetic background of the germplasm evaluated and, to a lesser extent, the impact of planting environments that affect the nutritional quality of sweet potato storage root that affect the preference of SPW are key factors in the success of finding sweet potato genotypes with good SPW resistance (Parr et al 2016). However, the results of this investigation are at odds with those of other studies (Zuraida et al 2005;Mau et al 2019), in which SPW resistant genotypes were scarcely ever found. One SPW-resistant clone was found by Zuraida et al…”

“…(2005) out of 50 genotypes tested, while one was discovered by Mau et al (2019) out of 10 tested clones. In addition, Adom et al (2018) found that one out of four sweet potato genotypes evaluated was less vulnerable to C. puncticollis.…”

A screening of resistance to sweet potato weevil (Cylas formicarius Fab.) in a collection of sweet potato clones under laboratory conditions

“…Therefore, the SPW-MR genotypes are potential sources for developing sweet potato superior varieties with high SPW resistance. The hybrid clone UNC2016.CIL/JPV-05 has also been recorded to have a high yield (23 t ha-1) in the previous study (Mau et. 2019).…”

“…Several purple, orange and yellow-fleshed sweet potato hybrid clones that have been generated and evaluated for yield potential and drought tolerance (Mau et al 2019) are potential sources of SPW resistance. Evaluation of these clones at an early generation would allow the selection of clones that exhibit the desirable agronomical traits and SPW resistance.…”

Diversity of soil organic carbon and water characteristics under different vegetation types in northern Bengkulu, Indonesia

“…The model developed in this study may be useful to evaluate the spatial and temporal distributions of the potential drought effects on crop growth and yields during the dry seasons, as well as to promote innovative technologies in crop performance improvements under water stress conditions. Mau et al (2019), for example, reported six F1 hybrids of drought-tolerance genotypes of sweet potatoes that can be highly productive in both normal and water-stressed conditions. On the other hand, problems related to soil water stress could be overcome by improving the SOC storage in the soil through the establishment of the annual plant population.…”