Low effectiveness of Duchess rock phosphate on pastures in northern Queensland

1990 ◽  
Vol 30 (1) ◽  
pp. 61 ◽  
Author(s):  
MA Gilbert ◽  
KA Shaw ◽  
JD Armour ◽  
JK Teitzel ◽  
J Standley
Keyword(s):  
Sorption Capacity ◽  
Rock Phosphate ◽  
Field Experiments ◽  
Yield Response ◽  
Acidic Soils ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Extractable P ◽  
Effect On Yield ◽  
P Sources

Rock phosphate from Duchess, northeastern Australia, and superphosphate were compared as phosphorus (P) sources for pasture in glasshouse and field experiments in northern Queensland. Duchess rock phosphate was an inferior source of P for pastures, compared with superphosphate. The yield response to rock phosphate, however, varied between soils. On strongly acidic soils with high P sorption capacity, rock phosphate increased yield and bicarbonate-extractable P in the soil. On near neutral soils of low P sorption capacity, rock phosphate had little effect on yield. When the rate of rock phosphate was expressed as citrate-soluble P, its performance improved relative to superphosphate. Rates of coarse Duchess rock phosphate need to be at least 10 times those of superphosphate to produce a similar effect on pasture growth. In a glasshouse experiment, the fine rock phosphate was 1.6 times more effective than the coarse material.

scholarly journals Evaluation of phosphate sorption capacity and external phosphorus requirement of some agricultural soils of the southwestern Ethiopian highlands

2021 ◽  
Vol 18 (2) ◽  
pp. 136
Author(s):  
Berhanu Dinssa ◽  
Eyasu Elias
Keyword(s):  
Sorption Capacity ◽  
Crop Production ◽  
Agricultural Soils ◽  
Soil Characteristics ◽  
Soil Samples ◽  
Phosphorus Sorption ◽  
Acidic Soils ◽  
Ethiopian Highlands ◽  
P Sorption ◽  
P Sorption Capacity

<span>One of the most soil fertility management problems for crop production on acidic soils of the Ethiopian highlands is phosphorus fixation. The research was executed to assess the P-sorption capacity and to determine the external P requirement of different acidic soils in the Southwestern highlands of Ethiopia. Phosphorus sorption capacity (Kf) and its relation with selected soil characteristics were assessed for some major agricultural soils in the Ethiopian highlands to answer the questions, ‘What are the amount of P-sorption capacity and external P requirement of Nitisols, Luvisols, Alisols, and Andosols in Ethiopia?’. Twelve surface soil samples (at depth of 0-30 cm) were gathered and the P-sorption capacity was estimated. Phosphorus-sorption data were obtained by equilibrating 1 g of the 12 soil samples with 25 ml of KH<sub>2</sub>PO<sub>4</sub> in 0.01 M CaCl2, having 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, and 330 mg P L<sup>-1</sup> for 24 hours. The data were adjusted to the Freundlich adsorption model and the relationship among P-sorption and soil characteristics was established by correlation analysis.  Clay content and exchangeable acidity, organic matter, Al<sub>2</sub>O<sub>3</sub>, and Fe<sub>2</sub>O<sub>3</sub> oxides have affected phosphorus-sorption at a significance level of (P &lt; 0.05).  Alisols had the highest Kf value (413 mg kg<sup>-1</sup>) but Nitisols had the lowest Kf (280 mg kg<sup>-1</sup>). The external phosphorus fertilizer requirement of the soils was in the order of 25, 30, 32, and 26 mg P kg<sup>-1</sup> for Nitisols, Luvisols, Alisols, and Andosols sequentially. The Kf varies among different soil types of the study area. The magnitude of the soil’s Kf was affected by the pH of the soil, soil OM content, and oxides of Fe and Al. Therefore, knowledge of the soils’ P retention capacity is highly crucial to determine the correct rate of P </span><span>fertilizer</span><span> for crop production.</span>

Phosphorus Extraction with Soil Test Methods Affected by Soil P Sorption Capacity

2020 ◽  
Vol 20 (4) ◽  
pp. 1882-1890 ◽  
Author(s):  
Gilmar Luiz Mumbach ◽  
Luciano Colpo Gatiboni ◽  
Daniel João Dall’Orsoletta ◽  
Djalma Eugênio Schmitt ◽  
Patrícia Pretto Pessotto ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Test Methods ◽  
Soil Test ◽  
Soil P ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Phosphorus Extraction

Phosphorus sorption and chemical characteristics of lightweight aggregates (LWA)-potential filter media in treatment wetlands

1997 ◽  
Vol 35 (5) ◽  
pp. 103-108 ◽  
Author(s):  
T. Zhu ◽  
P. D. Jenssen ◽  
T. Mæhlum ◽  
T. Krogstad
Keyword(s):  
Sorption Capacity ◽  
Metal Content ◽  
Exchange Capacity ◽  
Chemical Characteristics ◽  
Phosphorus Sorption ◽  
Filter Media ◽  
Total Metal Content ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Total Metal

Five light-weight aggregates (LWAs), suitable for filter media in subsurface flow constructed wetlands, were tested for potential removal of phosphorus (P). P-sorption variation is dependent on the chemical characteristics of the LWA. All LWAs exhibited high pH and high total metal content; however, P-sorption capacity varied by two orders of magnitude. Of the LWAs' chemical characteristics (total metal content, cation exchange capacity, and oxalate soluble Fe and Al), total metal content has the closest relationship with the P-sorption capacity. Among the four major metal ions (Mg, Ca, Fe and Al), Ca has the strongest correlation with the P-sorption capacity.

Phosphorus auditing cannot account for all of the phosphorus applied to different pasture soils

Soil Research ◽  
2004 ◽  
Vol 42 (1) ◽  
pp. 89 ◽  
Author(s):  
L. L. Burkitt ◽  
C. J. P. Gourley ◽  
P. W. G. Sale
Keyword(s):  
Soil Properties ◽  
Sorption Capacity ◽  
Vertical Movement ◽  
Single Application ◽  
Macropore Flow ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Sampling Zone ◽  
P Movement ◽  
Total P

Five field sites established in the high rainfall zone of southern Victoria were used to examine the downwards vertical movement of phosphorus (P) fertiliser on soils which ranged in P sorption capacity. Fertiliser was applied either as a single application of 280 kg P/ha at the beginning of the experiment (April 1998), or as 35�kg�P/ha reapplied every 6 months (totalling 210 kg P/ha by the end of the third year). Soil cores were sampled in June 2001 to a depth of 40 cm, and soil at depths of 0–5, 5–10, 10–20, 20–30, and 30–40 cm was analysed for a range of soil properties and total P concentration.Total P concentration changed very little down the profile, indicating that there was minimal vertical movement of P fertiliser below the 10 cm layer of 5 pasture soils following the single application of 280 kg P/ha or 35 kg P/ha reapplied every 6 months. Soils with low to moderate surface P sorption capacity showed a trend for higher total P concentrations at depth. However, quantitative relationships between vertical P movement and soil properties at depth were poor. A P audit resulted in variable recovery of the applied P (45–128%) in the surface 40 cm at each of the 5 sites. Consistently low P recoveries were achieved at one site, where the surface soil had a high P sorption capacity. Some applied P may have bypassed the high P sorbing surface layers at this site through macropore flow and moved beyond the 40 cm sampling zone, or have been lost to surface runoff. These results question the usefulness of P audit or mass-balance methods for accounting for P movement in a pasture-based system, as spatial heterogeneity of soil properties, both horizontally and vertically, was high in the current study.

Solubility and retention of phosphate in soils of the northwestern Canadian prairie

1991 ◽  
Vol 71 (4) ◽  
pp. 453-463 ◽  
Author(s):  
Y. K. Soon
Keyword(s):  
Organic Matter ◽  
Sorption Capacity ◽  
Agricultural Soils ◽  
Clay Content ◽  
Phosphorus Concentration ◽  
Canadian Prairie ◽  
P Sorption ◽  
P Sorption Capacity ◽  
P Concentration ◽  
Order Of Magnitude

Phosphate solubility and sorption characteristics of 39 agricultural soils in the northwestern Canadian Prairie were studied to gain insights into the retention of fertilizer P added to soil. The soils were mostly acidic with base saturation of 59–95%. The solubility of P as determined by the equilibrium P concentration and phosphoric acid potential was low and appeared to be controlled by sorption of phosphate by soil components. The mean equilibrium solution P concentration was 0.03 mg L−1. Phosphorus concentration in saturation extracts was about one order of magnitude higher, but would have included organic and colloidal P since P analysis in these extracts was done by ICP. Sorption capacity of P as determined by Langmuir isotherm was greater for the Dark Gray and Black soils and gleysols, i.e., soils with higher amounts of organic matter, than the Gray Luvisolic and Solodic soils by about 30%. Partial correlation showed that clay content, Al-organic matter complexes (AlOM) and amorphous iron oxide (FeOX) were significantly correlated with P sorption capacity. When both topsoils and subsoils were considered, clay content was the most important soil property influencing P sorption capacity, followed by AlOM and FeOX (standard partial regression coefficients, b′, of 0.47, 0.39 and 0.38, respectively). When only topsoils were considered, AlOM and FeOX became more important than clay content in influencing P sorption (b′ = 0.47, 0.47, and 0.33, respectively). Native P, estimated by oxalate and anion-resin extractions, was associated with the hydrous iron oxides only, although soil pH also affected the resin-extractable P fraction. Key words: P retention, solubility, Luvisols, solodic soils

scholarly journals Yield Response of Sunflower to Sowing Dates and NPK Rates under Zero Tillage in Wet Soil of Southwestern Coastal Bangladesh

Proceedings ◽  
2020 ◽  
Vol 36 (1) ◽  
pp. 202
Author(s):  
Bidhan Chandro Sarker ◽  
Md. Enamul Kabir ◽  
Md. Yasin Ali ◽  
Richard W. Bell
Keyword(s):  
Field Experiments ◽  
Winter Season ◽  
Low Fertility ◽  
Lower Amount ◽  
Yield Response ◽  
Cropping Pattern ◽  
Yield Increase ◽  
Coastal Bangladesh ◽  
Fertilizer Recommendation ◽  
Effect On Yield

The low cropping intensity in the southwestern coastal Bangladesh is constrained by excess wetness of soil, low fertility and scarcity of fresh irrigation water. Fallow-fallow-T. aman is the main cropping pattern in this region. In the recent years some winter (dry season) crops (wheat, sunflower, maize etc.) have been introduced. Among them sunflower is best suited as it can be established in wet soil and also having the capacity to tolerate salinity and drought to some extent. The fertility of soil of this area is low particularly nitrogen (N). There is no fertilizer recommendation for sunflower in this area. Thus it is necessary to develop a fertilizer recommendation for sunflower. To develop this, a set of field experiments were carried out during winter season (2018–19). In these experiments, the major nutrients [nitrogen (N), phosphorus (P) and potassium (K)] were varied in early (by November) and late (end of December) sown (dibbled) sunflower. Results showed that early sown sunflower produced higher seed yield with lower amount of N than that of late one. In case of P, unlike N, yield increase was not at par with the increase of P rates indicated residual P that applied to previous rice crop supported the sunflower. Potassium rates have little effect on yield increase. Based on the average yield (~3.5 t/ha) of the variety (Hysun-33) N, P and K @ 120–150, 40–50 kg/ha and 50–60 kg/ha was produced highest yield in early sown sunflower in excessively wet soil of southwestern coastal Bangladesh.

scholarly journals From Field Experiments to Regional Forecasts: Upscaling Wheat Grain and Forage Yield Response to Acidic Soils

2019 ◽  
Vol 111 (1) ◽  
pp. 287-302 ◽  
Author(s):  
Romulo P. Lollato ◽  
Tyson E. Ochsner ◽  
Daryl B. Arnall ◽  
Terry W. Griffin ◽  
Jeffrey T. Edwards
Keyword(s):  
Field Experiments ◽  
Forage Yield ◽  
Yield Response ◽  
Wheat Grain ◽  
Acidic Soils ◽  
Regional Forecasts

scholarly journals Phosphorus sorption capacity of different types of opoka

2007 ◽  
Vol 38 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Victor Cucarella ◽  
Tomasz Zaleski ◽  
Ryszard Mazurek
Keyword(s):  
Sorption Capacity ◽  
Sorption Isotherms ◽  
Freundlich Isotherm ◽  
Carbonate Content ◽  
Phosphorus Sorption ◽  
P Sorption ◽  
P Sorption Capacity ◽  
Onsite Wastewater Treatment Systems ◽  
Different Types ◽  
Phosphorus Sorption Capacity

Phosphorus sorption capacity of different types of opoka The bedrock opoka has been lately reported as an appropriate reactive media for onsite wastewater treatment systems due to its high phosphorus (P) sorption capacity. However, variations on its chemical composition may affect its reactivity with P, therefore leading to a variable P removal efficiency. In this paper, the P-sorption capacity of three different types of opoka from the region of Miechów, Poland, is reported. According to the silica and carbonate content, opoka samples were classified as light-weight and heavy-weight opoka. When heated over 900°C, opoka showed a very high P-sorption capacity that was well correlated to its Ca content. P-sorption isotherms from batch experiments with an artificial P solution were plotted and fitted to the Langmuir and Freundlich adsorption models. The Freundlich isotherm appeared to model better the P-sorption of light opoka and the Langmuir isotherm of heavy opoka, suggesting different dominating mechanisms of P-sorption by light and heavy opoka.

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