Siose, Taniela K. and Guinto, Danilo and Kader, Md. Abdul (2018) Organic amendments increased sweet potato (Ipomoea batatas L.) yield in calcareous sandy soil of Samoa. The South Pacific Journal of Natural and Applied Sciences, 36 (1). pp. 36-45. ISSN 1838-837X
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Abstract
A five-month field experiment was conducted to investigate the effects of organic amendments on yields of two
sweetpotato cultivars in a calcareous sandy soil of Samoa. The treatments consisted of three organic amendments;
gliricidia, gliricidia + biochar, poultry litter, and a control, and two improved sweetpotato cultivars (IB/PH/03 and
IB/PR/13). All amendments were applied at equivalent rate of 100 kg N ha-1 while biochar at 5 t ha-1
. Plots were
arranged in a RCB design with four replicates. Results showed that all organic amendments significantly increased
total storage root and marketable storage root yields, compared to yields of the control. Total marketable root yield
was increased by 134, 118, and 294% over control in response to gliricidia, poultry litter, and gliricidia + biochar
treatments, respectively. The highest yield, yield attributing parameters and nutrient uptake by storage root were
recorded in gliricidia + biochar treatment, which appears to synergistically influence crop yield relative to organic
amendments applied singly; a potential amendment for improving sweetpotato productivity in sandy calcareous soil.
Cultivar IB/PH/03 performed better than IB/PR/13 on all measured crop parameters except for fresh weight of nonmarketable root and percent dry matter content showing better potentiality for promotion under similar agroenvironmental conditions.
| Item Type: | Journal Article |
|---|---|
| Uncontrolled Keywords: | Organic amendments, Biochar, Calcareous sandy soil, Sweetpotato root yield |
| Subjects: | S Agriculture > S Agriculture (General) |
| Divisions: | Faculty of Business and Economics (FBE) > School of Agriculture and Food Technology |
| Depositing User: | Md. Abdul Kader |
| Date Deposited: | 08 Aug 2025 02:49 |
| Last Modified: | 08 Aug 2025 02:49 |
| URI: | https://repository.usp.ac.fj/id/eprint/11043 |
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