e-ISSN 2231-8542
ISSN 1511-3701

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Growth and Yield Performance of Five Purple Sweet Potato (Ipomoea batatas) Accessions on Colluvium Soil

Martini Mohammad Yusoff, Siti Nurjiah Abdullah, Mohd Ridzwan Abd Halim, Erwan Shah Shari, Nur Arina Ismail and Masnira Mohammad Yusoff

Pertanika Journal of Tropical Agricultural Science, Volume 41, Issue 3, August 2018

Keywords: Leaf area index (LAI), radiation use efficiency (RUE), sweet potato, total intercepted photosynthetically active radiation (PAR), tuber yield

Published on: 30 Aug 2018

A study was conducted to evaluate the growth and yield performance of five purple sweet potato accessions on colluvium soil at Field 2, Universiti Putra Malaysia, Serdang, Selangor. The treatments comprised five purple sweet potato accessions (Accessions 1, 2, 3, 5, and 6) arranged in completely randomized design with four replications. Maximum tuber yield of purple sweet potato was highest (p < 0.05) in Accession 6 (34,563 kg ha-1) compared to the lowest yield in Accession 3 (9,331 kg ha-1). This was followed by Accession 2 (22,031 kg ha-1), Accession 1 (21,094 kg ha-1), and Accession 5 (22,900 kg ha-1). A similar trend was observed for crop growth rate (CGR) with the highest (199 kg ha-1 day-1 ) in Accession 6 and the lowest (60 kg ha-1 day-1 ) in Accession 3 (p < 0.05). Accession 6 reached the critical leaf area index (LAIcrit) of 2.79 at 90% of intercepted radiation compared to the Accessions 1, 2, 3, and 5 that did not reach the LAIcrit. Unexpectedly, the highest total intercepted photosynthetically active radiation (PAR) was recorded by Accession 3 (340 MJ m-2), whereas Accession 6 showed the lowest (309 MJ m-2). In contrast, the highest radiation use efficiency (RUE) was obtained by Accession 6 with 7.58 g MJ-1 and the lowest was Accession 3 (2.16 g MJ-1 ). However, there was no significant difference in RUE among the rest of the accessions, except for Accession 6. To maximize the tuber yield, Accession 6 is the choice for cultivation in colluvium soil.

ISSN 1511-3701

e-ISSN 2231-8542

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