Research Data

Nutrient contents and associated parameters for cocoa tree leaves, ripe cocoa pods and soil from 63 cocoa farms in Papua New Guinea in 2007

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General
Title
Nutrient contents and associated parameters for cocoa tree leaves, ripe cocoa pods and soil from 63 cocoa farms in Papua New Guinea in 2007
Type
Dataset
Date Record Created
2012-05-24
Date Record Modified
2016-05-24
Language
English
Coverage
Date Coverage
2007-01-01 to 2008-01-01
Time Period
(no information)
Geospatial Location
  • Papua New Guinea
Description
Descriptions
  1. Type: brief

    Nutrient status of cocoa grown in Papua New Guinea.

  2. Type: full

    Summary from associated report: Cocoa is grown by approximately 151,000 households in Papua New Guinea (PNG). Smallholders, who produce 80% of the crop, have annual yields far below the potential of 4.4 tonnes/hectare. Yields are low for many socioeconomic and agronomic reasons. The aim of this study was to determine the nutrient status of cocoa grown in PNG, and to recommend further steps to determine if there are nutrient-related constraints on productivity and how they might be overcome. Leaf and soil nutrient contents were measured and grower practices were recorded at 63 cocoa blocks (smallholders, on plantations or on research stations) across the country. A wide variety of plant species were present in blocks, with Gliricidia being the most common shade tree. Based on published ‘critical’ levels for cocoa leaf nutrient contents, nitrogen and iron deficiencies occurred in more than 89% of the blocks and phosphorus deficiencies in about 25%. Leaf magnesium concentrations were mostly adequate, except in East New Britain, where 64% of the blocks were deficient. Deficiencies of potassium, calcium, manganese, boron, copper and zinc were encountered in 2–15% of the blocks. However, the ‘critical’ levels must be regarded with caution, as the micronutrient (manganese, boron, copper, iron and zinc) values were based on surveys rather than manipulative experiments, and the macronutrient (nitrogen, phosphorus, potassium, magnesium and calcium) values were established in different places with different planting materials. Leaf potassium and phosphorus contents were related to soil type and nutrient contents. In blocks that are being well maintained and regularly harvested, it is likely that yield is being constrained by nutrient deficiencies. Management of cocoa blocks in PNG must improve dramatically for the cocoa industry to prosper, and perhaps even to survive, particularly with the recent spread of cocoa pod borer, which is drastically reducing cocoa yields. To improve management and yields, the industry requires reliable critical levels of leaf nutrient concentrations, and nutrient management recommendations appropriate to different regions, based on trials. Effective means of facilitating adoption of improved practices must also be developed.

  3. Type: note

    This dataset is discussed in the publication: Nelson PN, Webb MJ, Berthelsen S, Curry G, Yinil D and Fidelis C. 2011. Nutritional status of cocoa in Papua New Guinea. ACIAR Technical Report No. 76. The Australian Centre for International Agricultural Research, Canberra. 67 pp.

  4. Type: note

    This dataset is available as a spreadsheet in MS Excel (.xlsx) and Open Document formats (.ods)

Related Publications
  1. Nelson PN, Webb MJ, Berthelsen S, Curry G, Yinil D and Fidelis C. 2011. Nutritional status of cocoa in Papua New Guinea. ACIAR Technical Report No. 76. The Australian Centre for International Agricultural Research, Canberra. 67 pp.
    JCU Publication Repository copy of report
  2. Nutritional status of cocoa in Papua New Guinea
    ACIAR copy of report
Related Websites
(no information)
Related Data
(no information)
Related Services
(no information)
Technical metadata
(no information)
People
Creators
  1. Managed by: Dr Paul Nelson , School of Earth & Environmental Sciences (6630)
  2. Aggregated by: Ms Suzanne Berthelsen , School of Earth & Environmental Sciences (6630)
  3. Aggregated by: Dr Michael Webb
Primary Contact
Dr Paul Nelson, paul.nelson@jcu.edu.au
Supervisors
(no information)
Collaborators
  1. George Curry. Department of Social Sciences, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia Email: g.curry@curtin.edu.au
  2. Michael Webb. Commonwealth Scientific and Industrial Research Organisation, Land and Water, Australian Tropical Science and Innovation Precinct, James Cook University, Townsville, Queensland 4814, Australia Email: michael.webb@csiro.au
  3. David Yinil. Papua New Guinea Cocoa Coconut Institute, Tavilo Research Centre, PO Box 1846, Rabaul, East New Britain province, Papua New Guinea Email: davyinil@yahoo.com.au
  4. Chris Fidelis. Papua New Guinea Cocoa Coconut Institute, Tavilo Research Centre, PO Box 1846, Rabaul, East New Britain province, Papua New Guinea Email: chrisfidelis4@gmail.com
Subject
Fields of Research
  1. 070306 - Crop and Pasture Nutrition (070306) (070306)
Socio-Economic Objective
  1. 820299 - Horticultural Crops not elsewhere classified (820299) (820299)
  2. 820399 - Industrial Crops not elsewhere classified (820399) (820399)
Keywords
  1. Nutrients
  2. Soil fertility
  3. Papua New Guinea
  4. cocoa
Research Activity
(no information)
Research Themes
Tropical Ecosystems, Conservation and Climate Change
Industries and Economies in the Tropics
People and Societies in the Tropics
Tropical Health, Medicine and Biosecurity
Rights
License
(no information)
License - Other
(no information)
Access Rights/Conditions
Open Access . If the data is not available via the provided link, please contact an associated party (preferrably the Manager as specified) for access.
Type
open
Rights
(no information)
Data
Data Location
Online Locations
Attachments
  1. Nutrient status of cocoa grown in Papua New Guinea Nelson et al 2011-ACIARTR76-data.zip (Data File, Public)
Stored At
Dr Paul Nelson, School of Earth and Environmental Sciences, Building A2, Room 209, Cairns Campus James Cook University, PO Box 6811, Cairns Queensland 4870, Australia, Call: (+61) 7 4042 1375, Fax: (+61) 7 4042 1284
Citation
Cite:
Nelson, P.; Webb, M.; Berthelsen, S.; Curry, G.; Yinii, D.; Fidelis, C. (2012). Nutrient contents and associated parameters for cocoa tree leaves, ripe cocoa pods and soil from 63 cocoa farms in Papua New Guinea in 2007. James Cook University. (dataset). http://dx.doi.org/10.4225/28/5743ED872A28C
Digital Object Identifier (DOI):
10.4225/28/5743ED872A28C