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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 339470
Title Sweet potato yields and nutrient dynamics after short-term fallows in the humid lowlands of Papua New Guinea
Author(s) Hartemink, A.E.
Source Netherlands Journal of Agricultural Science 50 (2003)3-4. - ISSN 0028-2928 - p. 297 - 319.
Department(s) International Soil Reference and Information Centre
ICSU World Data Centre for Soils
ISRIC - World Soil Information
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) ipomoea batatas - zwerflandbouw - verbeterde braak - piper aduncum - gliricidia sepium - imperata cylindrica - gewasopbrengst - papoea-nieuw-guinea - bodemvruchtbaarheid - voedingsstoffenbalans - zoete aardappelen - sweet potatoes - ipomoea batatas - shifting cultivation - improved fallow - piper aduncum - gliricidia sepium - imperata cylindrica - soil fertility - nutrient balance - crop yield - papua new guinea - ipomoea-batatas - imperata-cylindrica - gliricidia-sepium - piper-aduncum - use efficiency - nitrogen - soil - cultivation - growth - fertilization
Categories Cropping Systems / Cultivation, Cultural Methods
Abstract Shifting cultivation is common in the humid lowlands of Papua New Guinea but little is known about the effect of different fallows on sweet potato (Ipomoea batatas) yield and nutrient flows and pools in these systems. An experiment was conducted in which two woody fallow species (Piper aduncum and Gliricidia sepium) and a non-woody fallow species (Imperata cylindrica) were planted and slashed after one year. Sweet potato was grown for two consecutive seasons (1 year) after which the fallows and yields were compared with yields from continuously cropped plots. The experiment was conducted on a high base status soil (Typic Eutropepts). In the first season, marketable sweet potato yield after piper and imperata was about 11 t ha-1 but yields after gliricidia and under continuous cropping were significantly lower. Vine yield was similar for the continuously cropped plots and for the sweet potato after piper and gliricidia, but significantly lower than after imperata. The effects of the fallows on sweet potato yield lasted only one season. In the second season after the fallow, sweet potato yields were higher, which was contributed to lower rainfall. Nutrient budgets showed that the three fallow species (piper, gliricidia and imperata) added insufficient amounts of nitrogen, phosphorus and potassium for the removal of these nutrients by two consecutive seasons of sweet potato. From a yield point of view there seems no benefit in having a nitrogen-fixing fallow species like Gliricidia sepium in sweet potato based systems on high base status soils.
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