Calcium Phosphate Fertilizers: III. The Effect of Surface Area on the Availability Coefficients of the Dicalcium Phosphates

Bouldin, D. R.; Sample, E. C.

doi:10.2136/sssaj1959.03615995002300040015x

Cited by 26 publications

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“…Particle‐size can influence the P‐release properties of phosphate fertilizers . Different sizes of fertilizer particles may result in uneven distributions in soil and different particle surface areas modify reactions at fertilizer–soil interfaces . Furthermore, the particle size of a fertilizer influences occupational health and safety considerations and the opportunity to use farm machinery .…”

Section: Introductionmentioning

confidence: 99%

Leaching of Phosphorus and Cadmium in Soils Amended with Different Bone Chars

Morshedizad

Leinweber

2017

CLEAN Soil Air Water

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The benefits of bone char (BC) application may include both the mobilization of P for plant nutrition and immobilization of contaminant Cd in the soil. However, previous studies were conducted under equilibrium conditions that do not adequately reflect field conditions. Therefore, the objective was to study the effect of BC, surface-modified BC (BC plus ) and sulfur-enriched activated char (AC S ) application at different particle sizes on P-and Cd-mobilization under non-equilibrium conditions in a combined incubation-leaching experiment. Two soils each with the treatments (i) BC, (ii) BC plus , (iii) BC þ AC S , (iv) control (0 mg P kg À1 soil), and (v) AC S were leached five times during 70 days incubation. Over the complete incubation P-contents in leachates were significantly increased by BC and BC plus of 0.5-1 mm size. P-release from BCs was larger under non-equilibrium condition in this experiment compared with a previous continuous incubation experiment. AC s application reduced the P-release from BC of all particle sizes. The lowest leachate Cd-concentrations were found in soils amended with the smallest BC particles. Addition of BC plus and AC S significantly increased Cd leaching and the highest amounts of Cd were leached at the smallest particle size. In conclusion, the 0.5-1 mm size class of BCs performed best and should be introduced in practical agriculture using standard machinery.

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Section: Introductionmentioning

confidence: 99%

Leaching of Phosphorus and Cadmium in Soils Amended with Different Bone Chars

Morshedizad

Leinweber

2017

CLEAN Soil Air Water

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“…A, B and C,-(one for each fertilizer) were obtained which resulted in the smallest sum of squares of deviations from the concurrent Spillman model. The first crude estimate of A was computed graphically according to the procedure of Bouldin & Sample (1959).…”

Section: And the Estimatesmentioning

confidence: 99%

A quantitative evaluation of the comparative value of six fertilizer–nitrogen sources for potatoes

Swaminathan

1972

J. Agric. Sci.

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Six fertilizer-nitrogen sources, each at three levels, together with a control of no fertilizer-nitrogen were compared in field trials in two consecutive crop seasons on a sandy soil comparatively deficient in nitrogen at Patna, Bihar. Four mathematical models were fitted to the potato yield data in order to evaluate the relative availability indices of the individual fertilizers. Data collected on final stand and 'emergence rate' index (Bartlett) showed that while urea applications gave rise to a comparatively low speed of emergence, with observed shoot injuries, nitrate of soda caused poor final stands. The other fertilizers had no effect on either the final stand or the speed of emergence.Sulphate of ammonia was chosen as the standard fertilizer for the present study. Ammonium sulphate nitrate was as good as or even slightly better, while ammonium chloride and calcium ammonium nitrate were of intermediate efficiency, in that order. Urea and nitrate of soda were decidedly poor as nitrogen sources for potatoes under the conditions of the study. The concurrent Mitscherlich curves model was found to represent the behaviour of these fertilizers with a good measure of fit.The performance of the six fertilizers is discussed in the light of the availability of NH 4 + and NO 3~, the phytotoxicity of urea and nitrate of soda, and the harmful effects of Cl~. It is concluded that ammonium sulphate nitrate is the best carrier of nitrogen among those studied for potatoes under the conditions set forth.

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“…However, little attempt has of DCP in soil is controlle cf by the rate of diffusion of dissolved material soil (Bouldin and Sample, 1959) and after 26 months in uncroppe I f soil that pow % ered DCP was totally converted to other forms in a few days.…”

Section: Introductionmentioning

confidence: 99%

The Stability of Dicalcium Phosphate Dihydrate in Soil

Larsen¹

1970

Journal of Soil Science

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The rate of dissolution of dicalcium phosphate dihydrate (DCP) when incorporated in moist soil was investigated using ao;P. The moisture content of the DCP-soil mixture, the surface area of the DCP particles and the temperature of incubation of the system are all directly related to the rate of dissolution of the DCP. These results may be explained using a diffusion model in which phosphate ions diffuse from a water film adjacent to the DCP towards a sink provided by the soil.

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Calcium Phosphate Fertilizers: III. The Effect of Surface Area on the Availability Coefficients of the Dicalcium Phosphates

Cited by 26 publications

References 0 publications

Leaching of Phosphorus and Cadmium in Soils Amended with Different Bone Chars

Leaching of Phosphorus and Cadmium in Soils Amended with Different Bone Chars

A quantitative evaluation of the comparative value of six fertilizer–nitrogen sources for potatoes

The Stability of Dicalcium Phosphate Dihydrate in Soil

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