Zeolite/rock phosphate - a novel slow release phosphorus fertiliser for potted plant production

Pickering, H. W., Menzies, N. W. and Hunter, M. N. (2002) Zeolite/rock phosphate - a novel slow release phosphorus fertiliser for potted plant production. Scientia Horticulturae, 94 3-4: 333-343. doi:10.1016/S0304-4238(02)00006-7

Author Pickering, H. W.
Menzies, N. W.
Hunter, M. N.
Title Zeolite/rock phosphate - a novel slow release phosphorus fertiliser for potted plant production
Journal name Scientia Horticulturae   Check publisher's open access policy
ISSN 0304-4238
Publication date 2002-06-01
Sub-type Article (original research)
DOI 10.1016/S0304-4238(02)00006-7
Open Access Status Not yet assessed
Volume 94
Issue 3-4
Start page 333
End page 343
Total pages 11
Editor H. Challa
Place of publication Netherlands
Publisher Elsevier Science B.V.
Language eng
Subject C1
300202 Plant Nutrition
620209 Ornamentals, Australian natives and nursery plants
Abstract A glasshouse study was undertaken to determine if the zeolite mineral clinoptilolite from an Australian deposit in combination with rock phosphate (RP) could significantly enhance the uptake of P by sunflowers. The zeolite/RP combination was intended to act as an exchange-fertiliser, with Ca2+ exchanging onto the zeolite in response to plant uptake of nutrient cations (NH4+ or K) enhancing the dissolution of the RP. A reactive RP (Sechura) and a relatively non-reactive RP (Duchess) were examined. Zeolite was used in Ca2+-, K+- and NH4+-saturated forms at ratios of 3.5:1 and 7:1 with RP; Ca2+-zeolite was considered the control, with exchange-induced dissolution possible from K+-and NH4+-zeolite, The zeolite/RP mixture was applied as a vertical band adjacent to the sunflower seedling. In addition, N was supplied as urea in an effort to determine if RP dissolution resulted from H+ release by nitrification. Phosphorus supply from the zeolite/RP system was compared with an available P source (KH2PO4). The experiment clearly demonstrated greatly enhanced plant uptake of P from RP when applied in combination with NH4-zeolite, though the P uptake was lower than that from the soluble P source. The zeolite/RP interaction was much more effective with the reactive R-P than the non-reactive material, Within the NH4+-zeolite/RP band, root proliferation was greatly increased, as would be expected in an exchange-fertiliser system. The K+-zeolite system did not produce a significantly greater yield than the Ca2+-zeolite control, probably because adequate K+ supply from the basal application reduced uptake within the zeolite/RP band, thus reducing the extent of exchange-induced dissolution. Nevertheless, increased root proliferation within the band was observed, implying that exchange-induced dissolution may also be possible from this system. The zeolite/RP system offers the considerable advantage of P release in response to plant demand and is unique in this regard. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword Horticulture
Exchange Fertiliser
Rock Phosphate
Duchess Rock Phosphate
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Agriculture and Food Sciences
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Created: Wed, 15 Aug 2007, 04:16:45 EST