K and Mg retention and losses, as affected by soil and other site factors

Prabowo, Noto E., and Nelson, Paul N. (2015) K and Mg retention and losses, as affected by soil and other site factors. In: ACIAR Proceedings (144) p. 27. From: Workshop on Sustainable Management of Soil in Oil Palm Plantings, 7-8 November 2013, Medan, Indonesia.

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Abstract

Results of a series of seven long-term NPKMg fertilizer trials in different Sumatran sites showed variations in oil palm (Elaeis guiineensis Jacq.) responses to fertilisers. Identification of important site factors and quantification of their contribution on the response variations is studied. The information is essential to improve the current fertilizer recommendation system used for larger area of commercial fields with similar characteristics. Soil type, mineralogy and topography, and rainfall were possible factors that generated the variation. Soil retention and losses of the applied fertilisers by water mechanisms were studied in additional trials. The trials included comparisons of soil nutrients from added and zero K and Mg plots, runoff and leaching at sites with different rainfall and slopes, and a pot observation. Of the fertilisers applied the soils retained 9-41% K and 73-102% Mg. The effect of rainfall was greater than soil on nutrient loss. P. Rambong with double rainfall than Bah Lias received six and eight times greater loads of leaching and runoff, respectively. Consequently lost K and Mg by runoff on the same flat topography were respectively 1% and 2% at Bah Lias, and 18% and 10% at P. Rambong. Deep drainage removed the applied K and Mg by 2% and 5% at Bah Lias, and 15% and 23% at P. Rambong. The effect of land steepness exacerbated runoff losses of K and Mg to 28% and 13% at the higher rainfall site. Some possible measures to implement in the field included improved fertilizer application policy, and soil and water conservation.

Item ID: 31532
Item Type: Conference Item (Abstract / Summary)
ISBN: 978-1-925133-63-9
ISSN: 1038-6920
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Date Deposited: 21 Apr 2014 23:06
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050304 Soil Chemistry (excl Carbon Sequestration Science) @ 40%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management @ 20%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070306 Crop and Pasture Nutrition @ 40%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified @ 40%
82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8298 Environmentally Sustainable Plant Production > 829899 Environmentally Sustainable Plant Production not elsewhere classified @ 20%
96 ENVIRONMENT > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils @ 40%
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