Sorghum and soybean response to natural and modified phosphate rock on acid soils in Venezuela

1994 ◽  
Vol 25 (3-4) ◽  
pp. 215-224 ◽  
Author(s):  
E. Casanova ◽  
P. R. Solorzano
Keyword(s):  
Phosphate Rock ◽  
Acid Soils

Crop (Maize) Response to Direct Application of Local Phosphate Rock on Selected Acid Soils of Tanzania

2007 ◽  
Vol 38 (1) ◽  
pp. 93-106 ◽  
Author(s):  
M. M. Msolla ◽  
J. M. R. Semoka ◽  
C. Szilas ◽  
O. K. Borggaard
Keyword(s):  
Phosphate Rock ◽  
Acid Soils ◽  
Direct Application ◽  
Maize Response

scholarly journals PRINCIPAL COMPONENT ANALYSIS OF FACTORS DETERMINING PHOSPHATE ROCK DISSOLUTION ON ACID SOILS

2016 ◽  
Vol 8 (1) ◽  
pp. 10
Author(s):  
Yusdar Hilman ◽  
Anuar Abdul Rahim ◽  
Mohamed Hanafi Musa ◽  
Azizah Hashim
Keyword(s):  
Principal Component Analysis ◽  
Soil Texture ◽  
Phosphate Rock ◽  
Soil Acidity ◽  
Agricultural Land ◽  
Acid Soils ◽  
Principal Component ◽  
Component Analysis ◽  
Available Phosphorus ◽  
Organic C

Many of the agricultural soils in Indonesia are acidic and low in both total and available phosphorus which severely limits their potential for crops production. These problems can be corrected by application of chemical fertilizers. However, these fertilizers are expensive, and cheaper alternatives such as phosphate rock (PR) have been considered. Several soil factors may influence the dissolution of PR in soils, including both chemical and physical properties. The study aimed to identify PR dissolution factors and evaluate their relative magnitude. The experiment was conducted in Soil Chemical Laboratory, Universiti Putra Malaysia and Indonesian Center for Agricultural Land Resources Research and Development from January to April 2002. The principal component analysis (PCA) was used to characterize acid soils in an incubation system into a number of factors that may affect PR dissolution. Three major factors selected were soil texture, soil acidity, and fertilization. Using the scores of individual factors as independent variables, stepwise regression analysis was performed to derive a PR dissolution function. The factors influencing PR dissolution in order of importance were soil texture, soil acidity, then fertilization. Soil texture factors including clay content and organic C, and soil acidity factor such as P retention capacity interacted positively with P dissolution and promoted PR dissolution effectively. Soil texture factors, such as sand and silt content, soil acidity factors such as pH, and exchangeable Ca decreased PR dissolution.

scholarly journals The Changes of P-fractions and Solubility of Phosphate Rock in Ultisol Treated by Organic Matter and Phosphate Rock

2013 ◽  
Vol 17 (3) ◽  
pp. 203-210
Author(s):  
Sri Djuniwati ◽  
Budi Nugroho ◽  
Heru Bagus Pulunggono
Keyword(s):  
Organic Matter ◽  
Phosphate Rock ◽  
Acid Soils ◽  
Essential Elements ◽  
Imperata Cylindrica ◽  
Soil Reaction ◽  
P Fractions ◽  
Phosphate Rock Dissolution ◽  
Randomized Design ◽  
P Fraction

Phosphorus (P) is one of the essential elements for plant, however, its availability is mostly very low in acid soils. It is well documented that application of phosphate rock and organic matter are able to change the level of availability of P-form in acid soils.  The objective of the research were to evaluate the changes of P-fractions ( resin-P, NaHCO3-Pi, and NaHCO3-Po) and phosphate rock dissolution which were induced by application of organic matter (Imperata cylindrica, Pueraria javanica, dan Colopogonium mucunoides) and phosphate rock in Utisol Lampung.  The experiment was designed in a completely randomized design with three factors and three replications.  The first factor was the types of organic matter (I. cylindrica, P. javanica, and C. mucunoides), the second factor was the rate of organic matter (0, 2.5, and 5%), and the third factor was the rate of phosphate rock (0, 40, and 80 mg P kg-1).  The results showed that in the  rate of 0 and 1% organic matter, the type of organic matter did not affect P-fraction of NaHCO3-Pi, but in the rate of 2.5 and 5%,  NaHCO3-Pi due to application of  P. javanica, and C. mucunoides higher than due to application of  I. cylindrica.  However, the increasing rate of organic matter increased NaHCO3-Pi. Then, P-fraction of Resin-Pi was affected by the type of organic matter, the rate of  organic matter, and the rate of phosphate rock, respectively. P-fraction of resin-Pi due to application of P.  javanica, and C. mucunoides was higher than due to application of  I. cylindrica, but the effect of  P. javanica, and C. mucunoides was not different.  Increasing the rate of organic matter and phosphate rock increased P-fraction of resin-Pi and NaHCO3-Pi, but P-fraction of NaHCO3-Po was not affected by all treatments.  Meanwhile, dissolution of phosphate rock was affected by the kind of organic matter and soil reaction.  In the rate of 5% organic matter, dissolution of  phosphate rock by application of                                     I. cylindrica (70%) was higher than P. javanica (26.6%), and C.  mucunoides (33.5%), but in the rate of 1%, the effect of I. cylindrica , P. javanica, and C. mucunoides were not different.Keywords: C. mucunoides; I. cylindrica; P. javanica; phosphate rock; P-fractions[How to Cite: Djuniwati S, B Nugroho, and HB Pulunggono. 2012. The Changes of P-fractions and Solubility of Phosphate Rock in Ultisol Treated by Organic Matter and Phosphate Rock. J Trop Soils, 17: 203-210. doi: 10.5400/jts.2012.17.3.203][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.203]

scholarly journals PRINCIPAL COMPONENT ANALYSIS OF FACTORS DETERMINING PHOSPHATE ROCK DISSOLUTION ON ACID SOILS

2016 ◽  
Vol 8 (1) ◽  
pp. 10 ◽  
Author(s):  
Yusdar Hilman ◽  
Anuar Abdul Rahim ◽  
Mohamed Hanafi Musa ◽  
Azizah Hashim
Keyword(s):  
Principal Component Analysis ◽  
Soil Texture ◽  
Phosphate Rock ◽  
Soil Acidity ◽  
Agricultural Land ◽  
Acid Soils ◽  
Principal Component ◽  
Component Analysis ◽  
Available Phosphorus ◽  
Organic C

Many of the agricultural soils in Indonesia are acidic and low in both total and available phosphorus which severely limits their potential for crops production. These problems can be corrected by application of chemical fertilizers. However, these fertilizers are expensive, and cheaper alternatives such as phosphate rock (PR) have been considered. Several soil factors may influence the dissolution of PR in soils, including both chemical and physical properties. The study aimed to identify PR dissolution factors and evaluate their relative magnitude. The experiment was conducted in Soil Chemical Laboratory, Universiti Putra Malaysia and Indonesian Center for Agricultural Land Resources Research and Development from January to April 2002. The principal component analysis (PCA) was used to characterize acid soils in an incubation system into a number of factors that may affect PR dissolution. Three major factors selected were soil texture, soil acidity, and fertilization. Using the scores of individual factors as independent variables, stepwise regression analysis was performed to derive a PR dissolution function. The factors influencing PR dissolution in order of importance were soil texture, soil acidity, then fertilization. Soil texture factors including clay content and organic C, and soil acidity factor such as P retention capacity interacted positively with P dissolution and promoted PR dissolution effectively. Soil texture factors, such as sand and silt content, soil acidity factors such as pH, and exchangeable Ca decreased PR dissolution.

Can local Minjingu phosphate rock replace superphosphate on acid soils in Tanzania?

2006 ◽  
Vol 77 (3) ◽  
pp. 257-268 ◽  
Author(s):  
C. Szilas ◽  
J. M. R. Semoka ◽  
O. K. Borggaard
Keyword(s):  
Phosphate Rock ◽  
Acid Soils ◽  
Minjingu Phosphate Rock

scholarly journals CHARACTERISTICS OF PHOSPHATE ROCK MATERIALS FROM CHINA, INDONESIA AND TUNISIA AND THEIR DISSOLUTION IN INDONESIAN ACID SOILS

2016 ◽  
Vol 7 (2) ◽  
pp. 43
Author(s):  
Yusdar Hilman ◽  
Mohamed Hanafi Musa ◽  
Anuar Abdul Rahim ◽  
Azizah Hashim ◽  
Justina Sri Adiningsih
Keyword(s):  
Phosphate Rock ◽  
Agricultural Land ◽  
Acid Soils ◽  
Primary Concern ◽  
Land Resources ◽  
Retention Capacity ◽  
Chemical Laboratory ◽  
Extractable P ◽  
System Experiment ◽  
P Retention

Dissolution of phosphate rock (PR) in soils is a primary concern for P in the PR to be available for plant. The dissolution of three PR materials, China (CPR), Ciamis (IPR) and Gafsa (GPR), in eight acid Indonesian soils (pH in water 4.1-5.7) was tested in a closed incubation system. Experiment was conducted in Soil Chemical Laboratory, Universiti Putra Malaysia and Indonesian Center for Agricultural Land Resources Research and Development from January to April 2002. The dissolution was determined from the increase in either 0.5 M NaOH extractable P (∆P) or 1 M BaCl2-triethanolamine (TEA)-extractable Ca (∆Ca) in soils amended with PR compared with control soil. Dissolution of the IPR was the highest (30-100%) followed by GPR (17-69%) and then by CPR (20-54%). The maximum dissolution followed the order: Bogor Ultisols > Bogor Oxisols > Subang Inceptisols > Bogor Inceptisols > Sukabumi Oxisols > Lebak Ultisols > Sukabumi Inceptisols > Lampung Ultisols. PR dissolution indicated a positive correlation with P retention capacity. The results implied that the extent of PR dissolution for the three PR sources (China, Indonesia and Tunisia) increased with increasing P retention capacity of the soils. PR dissolution can be based on a calibration curve of ∆Ca meaning that if ∆P is high then the amount of PR dissolution measured by ∆Ca in PR materials is also high.

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