New Zealand Journal of Crop and Horticultural Science abstracts
Effects of extraction and fractionation time on the yield of compost
humic acids
O. H. Ahmed
M. H. A. Husni
A. R. Anuar
M. M. Hanafi
Department of Land Management
Faculty of Agriculture
University Putra Malaysia
43400 Serdang
Selangor, Malaysia
Abstract The yield of humic acids (HA) partly depends
on the period of isolation (extraction and fractionation), extractants used,
and conditions such as temperature, pre-treatments, and compost:extractant
ratios of extraction. This study was conducted to investigate whether a relationship
could be separately established between extraction time, fractionation time,
and the yield of HA from composted pineapple (Ananas comosus) leaves,
as well as the relationship between both variables (extraction time and fractionation
time) on the yield of HA from this compost. Standard procedures (with some
modifications) using 0.1M NaOH were used to isolate HA from compost. Although
there was a quadratic relationship between extraction time and HA yield,
there was no relationship between fractionation time and HA yield. This observation
enables the isolation of HA of compost within 24 h or less instead of the
existing average time of 48 h, hence helping in facilitating the idea of
producing potassium humate as a foliar potassium fertiliser from composted
pineapple leaves and related crop residues instead of open burning, a practice
that has undesirable environmental effects.
Keywords pineapple leaves; trend analysis; humic acid;
compost
H04063; Online publication date 13 May 2005 Received 29 July 2004; accepted
15 January 2005
New Zealand Journal of Crop and Horticultural Science, 2005, Vol. 33:
107-110
0014-0671/05/3302-0107 © The Royal Society of New Zealand 2005
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