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Evaluation of Nutrient Uptake of Selected Cover Crops and Biochar on the Yield Advantage of Two Taro (Colocasia esculenta) Cultivars in Samoa

Anand , Sanjay (2018) Evaluation of Nutrient Uptake of Selected Cover Crops and Biochar on the Yield Advantage of Two Taro (Colocasia esculenta) Cultivars in Samoa. The South Pacific Journal of Natural Sciences, 36 (1). pp. 9-17. ISSN 1013-9877

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    Abstract

    A study was conducted in three agro ecological zones of Samoa to compare the dry matter yields and nutrient uptake of selected tropical cover crops and biochar application on different Samoan inceptisols. Subsequent improvements in corm yield of the two taro cultivars, (Samoa 1 and Samoa 2), under these fallow systems were also determined. The split-plot arrangement with main plots as cover crops and subplots as the cultivars was used, with four replications. The evaluated cover crops included: a reference – grass fallow treatment (farmers practice), Mucuna pruriens, Erythrina subumbrans, Mucuna pruriens + 200 kg of NPK fertiliser (12-5-20), farmer’s reference practice + 400 kg of NPK fertiliser (12-5-20), and biochar produced from coconut shells. The biomass samples were collected after the six month of fallow duration. Plant tissue analyses revealed that the nitrogen and the phosphorus contents of erythrina was higher than corresponding mucuna cover across all three sites. However, as a result of higher biomass production, Mucuna pruriens showed the highest nutrient accrual over the six month fallow duration. The general yield trend under different fallow practices across all the sites indicates that mucuna with modest supplementation of complete fertilisers can help maintain optimum taro yields. However, it appears that the yield responses of the taro crop to fallow treatments are site-specific. Keywords: Fallow; Cover crop; Nutrient uptake

    Item Type: Journal Article
    Uncontrolled Keywords: Fallow; Cover crop; Nutrient uptake
    Subjects: S Agriculture > S Agriculture (General)
    Divisions: Faculty of Business and Economics (FBE) > School of Agriculture and Food Technology
    Depositing User: Sanjay Anand
    Date Deposited: 19 Feb 2019 14:57
    Last Modified: 19 Feb 2019 14:57
    URI: http://repository.usp.ac.fj/id/eprint/11183
    UNSPECIFIED

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