Agronomic effectiveness of partially acidulated phosphate rock as influenced by soil phosphorus-fixing capacity

Chien, S. H.; Hammond, L. L.

doi:10.1007/bf02377064

Cited by 30 publications

(17 citation statements)

References 15 publications

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“…Compared to chemical P fertilisers, phosphate rock is locally available and cheaper but its slow reactivity (as substantial effects are sometimes not seen during the first year of application) and the dusty character of the finely ground material (blowing away effects) are constraints to its adoption by farmers (Chien and Hammond 1989;Gerner and Mokwunye 1995). Mowo (2000) showed that the reactivity of phosphate rock in the soil depends mainly on the calcium carbonate content of the rock.…”

Section: Introductionmentioning

confidence: 99%

Organic resources and earthworms affect phosphorus availability to sorghum after phosphate rock addition in semi-arid West Africa

Ouédraogo¹,

Brussaard

Mando

et al. 2005

Biol Fertil Soils

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A field experiment was laid out in Burkina Faso (West Africa) on an Eutric Cambisol to investigate the interaction of organic resource quality and phosphate rock on crop yield and to assess the contribution of earthworms (Millsonia inermis Michaelsen) to P availability after phosphate rock application. Organic resources of different quality were applied at a dose equivalent to 40 kg N ha −1 with or without phosphate rock from Kodjari (Burkina Faso) at a dose equivalent to 25 kg P ha −1 , and were compared with control and single phosphate rock treatments in a factorial complete block design with four replicates. Sorghum (Sorghum bicolor L. Moench) variety SARIASSO 14 was grown. Sheep dung had the highest impact on earthworm casting intensity followed by maize straw. Combining organic resources with phosphate rock reduced earthworm casting activities compared to a single application of organic resources or phosphate rock. Addition of phosphate rock to maize straw reduced P availability in earthworm casts whereas combining sheep dung or compost with phosphate rock increased P availability. The contribution of earthworms to Kodjari phosphate rock solubilisation mainly occurred through their casts, as the available P content of casts was 4 times higher than that of the surrounding soil.

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Section: Introductionmentioning

confidence: 99%

Organic resources and earthworms affect phosphorus availability to sorghum after phosphate rock addition in semi-arid West Africa

Ouédraogo¹,

Brussaard

Mando

et al. 2005

Biol Fertil Soils

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“…On limed soils and soils of weaker P-fixing capacity, plant growth was improved by acidulation up to about 50%. Incubation studies (Mokwunye & Chien, 1980) and other plant growth studies (panda & Misra, 1970;Lutz, 1973;Garbouchev, 1981;Rajan, 1987;Chien & Hammond, 1989) further suppon the general findings of McLean and his co-workers. Similarly, physical mixtures of superphosphate and PR, that contain about 50 -60% of their total P in a water soluble form, have also proved to be as effective as fully acidulated materials when used on soils that vary greatly in texture and pH (Hagin & Katz, 1985; Results obtained in a previous investigation (Thibaud, Farina, Hughes & Johnston, 1992) indicated that granular Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate in two P-responsive soils, particularly when the soils had been limed to near optimum levels of acidity.…”

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confidence: 69%

Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

Thibaud

Farina

Hughes

et al. 1993

South African Journal of Plant and Soil

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A previous investigation showed that Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate. However, in the light of reports that P availability is enhanced when phosphate rock (PR) and monocalcium phosphate are combined, an improvement in Langfos effectiveness was considered possible if mixed with superphosphate. To investigate this, an Avalon sandy loam and a Balmoral clay were treated with a total of 0, 50, 100, 175, 250 and 350 mg P kg-1 and .0, 200, 400, 800 and 1600 mg P kg-1 , respectively, applied as a mixture of superphosphate and Langfos to provide P from the two sources in the ratios of 1 :0, 4:1, 2:1, 1 :1, 1 :2, 1:4 and 0:1. Soils were incubated for four weeks before planting to maize. Plants were harvested after six weeks and yield data obtained Were examined in relation to total P, water soluble P and citric acid soluble P applied, and to the quantities of P extracted by the Bray 1, Ambic, Mehlich 3 and modified Truog extractants. The water and citric acio' soluble P contents of the various mixtures provided a more reliable index of plant available P, than did their total P contents. The relative agronomic effectiveness of the superphosphate -Langfos mixtures increased in close association with an increase in the proportion of superphosphate in the mixture, and there was little evidence to suggest that an interaction between Langfos and superphosphate had occurred. Both the Ambic and Bray 1 extractants provided reliable indices of plant available P.

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“…This issue is very relevant because the main negative feature of RP as a P source for pastures cultivated in acidic soils is its poor short-term (1-year) effect in comparison with that of water-soluble P fertilizers, thus negatively affecting yield and quality [1]. However, the long-term action (3-4 years) of RP-based fertilizers as a P source for pastures cultivated in acidic soils may be even more efficient than that of water-soluble P fertilizers [1,4,5]. This fact indicates that both fertilizers (HA-Trp activated RP and SSP) may be rather complementary in a whole fertilization plan for pastures in acidic soils.…”

Section: Resultsmentioning

confidence: 99%

“…However, although some authors have reported that the efficiency of RP as a P source for pastures cultivated in acid soils is as effective as that of SSP or TSP in long-term studies (3-4 years) [1,4,5], most studies have shown that RP efficiency is normally lower than that of water-soluble P fertilizers, with this fact being likely related to the lower short-term (1-year) efficiency of RP as a source of plantavailable P with respect to that of water-soluble P (SSP or TSP) [1].…”

Section: Introductionmentioning

confidence: 99%

Improving the short-term efficiency of rock phosphate-based fertilizers in pastures by using edaphic biostimulants

Fernández

Baigorri

Urrutia

et al. 2016

Chem. Biol. Technol. Agric.

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Background: The use of reactive rock phosphate (RP) in acidic soils as a phosphate (P) source for pastures and crops presents attractive economic advantages with respect to soluble phosphate. However, some studies have demonstrated that the short-term (1-year) efficiency of RP, compared with that of water-soluble P, is relatively poor. This fact penalizes not only the yield and quality of the earlier harvests, but even the whole final yield when the crop is affected by some abiotic or biotic stress at the beginning of the cycle. In the present study, we investigated the ability of new edaphic biostimulants to increase the short-term efficiency of RP-based fertilizer as a P source for pastures cultivated in acid soils. To this end, we have granulated rock phosphate with two edaphic biostimulants: tryptophan and a heteromolecular organic complex formed by humic acid and tryptophan through iron bridges, and compared their short-term P fertilizer efficacy with that of single superphosphate and rock phosphate. Results:Soil incubation studies showed that the heteromolecular complex humic acid-tryptophan and Tryptophan were able to increase soil CO 2 production compared with native soil, rock phosphate, and superphosphate. Likewise, the presence of humic acid-tryptophan complex and Trp significantly increases plant-available phosphate compared with rock phosphate, up to levels similar to those of superphosphate. Plant (ray grass)-soil-pot studies showed that rock phosphate/(humic acid-tryptophan) formulation yielded values for both ray grass dry matter production and shoot P concentration, clearly higher than those of rock phosphate and rock phosphate/tryptophan. In addition, the results associated with rock phosphate/(humic acid-tryptophan) were similar to those for superphosphate, after 3 months of cultivation.Conclusions: Taken together, these results showed the suitability of the use of specific humic acid-based edaphic biostimulants to improve the short-term effect of rock phosphate fertilizers as a phosphate source for pastures cultivated in acid soils.

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Agronomic effectiveness of partially acidulated phosphate rock as influenced by soil phosphorus-fixing capacity

Cited by 30 publications

References 15 publications

Organic resources and earthworms affect phosphorus availability to sorghum after phosphate rock addition in semi-arid West Africa

Organic resources and earthworms affect phosphorus availability to sorghum after phosphate rock addition in semi-arid West Africa

Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions

Improving the short-term efficiency of rock phosphate-based fertilizers in pastures by using edaphic biostimulants

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