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Influence of Various Composted Organic Amendments and Their Rates of Application on Nitrogen Mineralization and Soil Productivity Using Chinese Cabbage ( Brassica rapa. L. var. Chinensis ) as an Indicator Crop

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  • Charlie Suruban

    (Agriculture and Food Technology Discipline, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, University of the South Pacific, Apia-1343, Samoa
    National Agriculture Research Institute, Lae 411, Papua New Guinea)

  • Md. Abdul Kader

    (Agriculture and Food Technology Discipline, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, University of the South Pacific, Apia-1343, Samoa
    Department of Soil Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
    Agriculture Discipline, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia)

  • Zakaria M. Solaiman

    (UWA School of Agriculture and Environment and the UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6009, Australia)

Abstract

There is a diversity of locally available nitrogen (N)-rich organic materials in Samoa. However, none of them was evaluated for their N supplying capacity after composting in Samoan Inceptisols for vegetable cultivation. Thus, N-releasing capacity of five composted organic amendments (OAs) namely macuna, gliricidia, erythrina, lawn grass and giant taro, and their two application rates (10 and 20 t ha −1 ) were assessed through a laboratory incubation and a crop response study using Chinese cabbage as a test crop. Among the OAs, composted mucuna was characterized by a higher total N (2.91%), organic C (63.6%) and NO 3 − N content (341 mg N kg −1 ). A significant difference in N mineralization was observed among the OAs as well as application rates. The highest N mineralization was recorded in composted mucuna followed by gliricidia, erythrina, lawn grass, and giant taro. A crop response study also showed a similar trend. Mucuna treatment had the highest biomass yield and N uptake followed by gliricidia, erythrina, lawn grass, and giant taro. Leguminous composted OAs @ 20 t ha −1 performed substantially better in all the plant growth and yield parameters, and N uptake compared to 10 t ha −1 that was not the case for non-leguminous OAs. Thus, non-leguminous OAs should be applied at 10 t ha −1 . All the composted leguminous OAs showed promising results while mucuna was the best in both the application rates. Therefore, mucuna can be promoted to supply N for crop cultivation in Samoa, other Pacific Islands and tropical countries where N fertilizer is costly and not easily available.

Suggested Citation

  • Charlie Suruban & Md. Abdul Kader & Zakaria M. Solaiman, 2022. "Influence of Various Composted Organic Amendments and Their Rates of Application on Nitrogen Mineralization and Soil Productivity Using Chinese Cabbage ( Brassica rapa. L. var. Chinensis ) as an Indic," Agriculture, MDPI, vol. 12(2), pages 1-18, January.
  • Handle: RePEc:gam:jagris:v:12:y:2022:i:2:p:201-:d:739831
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    References listed on IDEAS

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    1. Randy Carlie Pierre-Louis & Md. Abdul Kader & Nandakumar M Desai & Eleanor H John, 2021. "Potentiality of Vermicomposting in the South Pacific Island Countries: A Review," Agriculture, MDPI, vol. 11(9), pages 1-17, September.
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    Cited by:

    1. Tahsina Sharmin Hoque & Ahmed Khairul Hasan & Md. Arefin Hasan & Nurun Nahar & Debasish Kumer Dey & Shamim Mia & Zakaria M. Solaiman & Md. Abdul Kader, 2022. "Nutrient Release from Vermicompost under Anaerobic Conditions in Two Contrasting Soils of Bangladesh and Its Effect on Wetland Rice Crop," Agriculture, MDPI, vol. 12(3), pages 1-17, March.

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