+ Site Statistics
References:
52,654,530
Abstracts:
29,560,856
PMIDs:
28,072,755
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Agronomic effectiveness of partially acidulated phosphate rock fertilizers in an allophanic soil at near-neutral pH



Agronomic effectiveness of partially acidulated phosphate rock fertilizers in an allophanic soil at near-neutral pH



Communications in soil science and plant analysis1(3-4): 423-435



The agronomic effectiveness of five partially acidulated phosphate rocks (PAPRs) and an unground phosphate rock (PR) were compared against single superphosphate (SSP) in a glasshouse experiment using a high phosphorus (P) retention soil at a near-neutral pH (pH 6.5), and corn (Zea mays L.) as the test crop. The PAPRs were prepared by acidulating unground North Carolina PR with either phosphoric or sulphuric acid (expressed as Phos-PAPR and SA-PAPR, respectively) and at three levels of acidulation (20, 33, and 50%). The relative agronomic effectiveness (RAE) and substitution value (SV) of the test fertilizers, calculated with respect to SSP using the standard "vertical" and "horizontal" comparisons, showed that 50% phosphoric acidulated PAPR performed as effectively as SSP whereas the other fertilizers were less effective. The PR treatment showed a small yield response. The dry matter yield and P uptake were linearly related to water-soluble P of the fertilizers up to 66% of total P and there was no advantage in acidulating fertilizers above this level of water-soluble P using reactive PR. Whereas very little of the directly-applied PR dissolved (3.4% of PR applied), PR applied as a component of PAPRs dissolved up to 22%. The dissolved proportion of added PR component increased with increasing water-soluble P content of the fertilizer. The results suggest a greater efficiency of PAPR than SSP as a P supplier to plants.

(PDF emailed within 0-6 h: $19.90)

Accession: 003354266

Download citation: RISBibTeXText

DOI: 10.1080/00103620009370447


Related references

Long-term greenhouse evaluation of partially acidulated phosphate rock fertilizers. III. Agronomic effectiveness relative to single superphosphate. Fertilizer Research 29(3): 295-307, 1991

Agronomic effectiveness of partially acidulated phosphate rock as influenced by soil phosphorus fixing capacity. Plant & Soil 120(2): 159-164, 1989

Dissolution and agronomic efficiency of phosphate rock and partially acidulated phosphate rock fertilizers in some acid lowland rice soils in tropical Asia. Workshop on phosphate sources for acid soils in the humid tropics of Asia, 6-7 November 1990, Kuala Lumpur, Malaysia: 145-162, 1992

The agronomic effectiveness of reactive rock phosphate, partially acidulated rock phosphate and monocalcium phosphate in soils of different pH. Fertilizer Research 34(2): 161-171, 1993

Unacidulated and partially acidulated phosphate rock: agronomic effectiveness and the rates of dissolution of phosphate rock. Fertilizer Research 33(3): 267-277, 1992

Agronomic effectiveness of partially acidulated phosphate rock. Pedosphere 4(2): 137-144, 1994

Agronomic effectiveness of a partially acidulated reactive phosphate rock fertiliser. Australian Journal of Experimental Agriculture 37(8): 985-993, 1997

Agronomic effectiveness of partially acidulated rock phosphate and fused calcium-magnesium phosphate compared with superphosphate. Fertilizer Research 32(2): 169-183, 1992

Agronomic effectiveness of partially acidulated phosphate rock fertilisers in selected New Zealand soils. Australian Journal of Experimental Agriculture 35(3): 387-393, 1995

Agronomic efficiency of a partially acidulated rock phosphate in a cerrado soil. Revista Brasileira de Ciencia do Solo 12(2): 179-183, 1988

An assessment of the agronomic efficiency of partially acidulated phosphate rock fertilisers. Fertilizer Research 10(3): 269-282, 1986

The manufacture and agronomic efficiency of a partially acidulated phosphate rock fertilizer. Soil Science Society of America journal 45(5): 970-974, 1981

Agronomic evaluation of partially acidulated phosphate rock in acid soils. Revista de la Facultad de Agronomia, Universidad Central de Venezuela 17(1-4): 449-459, 1991

Effectiveness of partially acidulated phosphate rock (PAPR) prepared from Eppawala rock phosphate as a phosphorus fertilizer. Tropical Agriculturist 145: 45-49, 1989

Influence of manufacturing variables on characteristics and the agronomic value of partially acidulated phosphate fertilizers. Fertilizer Research 26(1-3): 119-138, 1990