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.

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.

The effects of addition of bauxite red mud to soil on P uptake by plants

2004 ◽  
Vol 55 (1) ◽  
pp. 25 ◽  
Author(s):  
K. Snars ◽  
J. C. Hughes ◽  
R. J. Gilkes
Keyword(s):  
Red Mud ◽  
Chemical Properties ◽  
P Uptake ◽  
Retention Capacity ◽  
Extractable P ◽  
P Application ◽  
Very High ◽  
Different Levels ◽  
Plant Available P ◽  
P Retention

The chemical properties of red mud, a byproduct of Bayer process refining of bauxite to alumina, make disposal of the material problematic. It is very alkaline (pH > 11), contains a large amount of sesquioxides, and thus has a very high P retention capacity. These characteristics have encouraged its use as a soil amendment to enhance P retention in sandy soils. A glasshouse experiment was carried out to investigate the effect of red mud on plant-available P. Leached red mud (LRM) (pH 7.24) was mixed at rates of 0, 5, 10, and 20 t/ha with a very sandy soil, provided with a full basal fertiliser and various rates of phosphate, and then sown with perennial ryegrass. Five harvests were obtained over a period of 245 days. At the end of the experiment the highest rate of addition of LRM gave an increase in soil pH of less than one unit and the electrical conductivity had not changed substantially or systematically. Bicarbonate-extractable P (bic-P) had decreased considerably from the initial values. However, there were no significant differences between bic-P values at the different levels of red mud application for the same rate of P application. Plant yield was not significantly different between treatments. Addition of red mud (a) decreased the P concentration of plants for the same amount of P applied; and (b) required a larger amount of bic-P to maintain a constant level of P in the plant. The red mud had adsorbed both applied and existing P and reduced the plant availability of bic-P. The economic impact of these processes needs evaluation.

A comparison between plant response and chemical measurements of the dissolution of reactive phosphate rock in soils of different pH and phosphorus retention

Soil Research ◽  
1987 ◽  
Vol 25 (4) ◽  
pp. 451 ◽  
Author(s):  
IAK Kanabo ◽  
RJ Gilkes
Keyword(s):  
Soil Ph ◽  
Phosphate Rock ◽  
Dry Weight ◽  
Plant Response ◽  
Retention Capacity ◽  
Chemical Measurements ◽  
Weight Yield ◽  
P Content ◽  
Soluble P ◽  
P Retention

Chemical measurements of the dissolution of reactive North Carolina phosphate rock (PR) in a lateritic podzolic soil adjusted to different pH values or amended to different P retention capacities were compared with plant response data. Soil pH adjustment consisted of incubating soil mixed with dilute HCl or solid SrCO3. The P retention capacity was adjusted by adding different amounts of synthetic goethite. Clover was grown as a test crop under glasshouse conditions on soils treated with no P and 800 �g Pg-1 soil as PR. The dissolution of PR, measured as the increase in soil exchangeable Ca (�Ca) at harvest time, increased by 46% for a decrease in soil pH from 5.78 to 4.55. Both dry weight and P content of clover tops showed no response to the greater PR dissolution at low soil pH, although twice as much P was bicarbonate-soluble at pH 4 55 compared with pH 5.78. This increase in bicarbonate-soluble P was only partly due to the greater dissolution of PR. Increasing the goethite content of the soil by 9% resulted in a 107% increase in PR dissolution but induced a 54% decrease in the bicarbonate-soluble P level compared with the control soil and consequently reduced both dry weight yield and P content of clover tops by 19% and 34% respectively.

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 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.

Prospects for increasing the volume of agricultural production for export due to the expansion and intensification of the use of Russian land resources

2021 ◽  
pp. 40-47
Author(s):  
Gennadiy A. Polunin ◽  
Keyword(s):  
Agricultural Production ◽  
Agricultural Land ◽  
Arable Land ◽  
Agricultural Products ◽  
Land Resources ◽  
The Past ◽  
Federal Districts ◽  
Near Future

The article is devoted to substantiating the prospects for increasing the marginal volumes of agricultural production for export in the next four years. Two scenarios of such production are considered: 1) expansion and 2) intensification of the use of land resources. As part of the development of the first scenario, an analysis of the distribution of unused agricultural land, including arable land, by federal districts was carried out. Also, based on the forecast of the introduction of additional annual volumes of acreage in the subjects of the Federation, the calculation of additional volumes of agricultural production, which can be expected in the next four years, was carried out. The analysis of data on the increase in the yield of export-oriented crops over the past five years has been carried out, in the framework of the second scenario, the calculation of the projected additional yield due to the intensification of agriculture is presented. The results of the study indicate that the intensification of agriculture will have the greatest impact on the growth of production and export of agricultural products in the near future.

scholarly journals Evaluation of the efficiency of using agricultural land in agricultural production

2021 ◽  
pp. 135-139
Author(s):  
L. V. Kireicheva ◽  
V. A. Shevchenko ◽  
I. F. Yurchenko
Keyword(s):  
Land Use ◽  
Agricultural Production ◽  
Quantitative Methods ◽  
Agricultural Land ◽  
Land Reclamation ◽  
Theory And Practice ◽  
Successful Implementation ◽  
Industrial Complex ◽  
Land Resources ◽  
Integral Assessment

Relevance. The effective use of agricultural land is a fundamental prerequisite for the successful implementation in the agro-industrial complex of the task of providing the population with food, and production with raw materials. At the same time, the issues of methodological support of the procedures for determining the integral indicator for assessing the use of agricultural land, established on the basis of a theoretically grounded unified approach based on quantitative methods, have been developed with insufficient completeness. Actualization of the issues of improving the theory and practice of assessing the effectiveness of the use of agricultural land in agricultural production is becoming one of the priority tasks of land reclamation science. The purpose of this work is to create a methodological basis for the process of assessing the use of agricultural land, which guarantees the comparability of the considered options for agroproduction in different natural and economic conditions.Methods. The research is based on the method of point assessments for indicators of agricultural land exploitation and the formation on their basis an integral criterion of land use efficiency. The proposed procedure includes: analysis of statistical data characterizing the dynamics of the values of indicators of used land resources, calculation of local assessments of the feasibility of their exploitation and assessment of the efficiency of land use according to a generalizing criterion represented by the sum of these local assessments.Results. A methodology has been developed and a method has been created for determining the efficiency of the use of agricultural land, based on a generalized integral assessment of the operation of agricultural land, which allows to identify bottlenecks in agricultural production and outline rational directions for the development of land use. The testing of the algorithm of the methodology and capabilities of the scale for the integral assessment of the efficiency of the use of land resources was carried out on the example of the Non-Black Earth Zone of the Russian Federation. Shown is an unsatisfactory (below the national average) contribution of agricultural production to the gross regional product. On the whole, positive dynamics of agricultural production in the Non-Black Earth Zone was established, which is achieved due to the development of animal husbandry, which is an effective factor in the formation of modern efficient agriculture of the territory, with the orientation of the crop production system on the raw material basis of feed production or the sector of the economy of the agro-industrial complex of the territory.

scholarly journals Особенности использования земельных ресурсов в АПК и овощеводстве Российской Федерации

2019 ◽  
Author(s):  
A.F. Razin ◽  
R.A. Meshсheryakova ◽  
O.A. Razin ◽  
N.N. Lebedeva ◽  
T.N. Surikhina ◽  
...  
Keyword(s):  
Russian Federation ◽  
System Analysis ◽  
Agricultural Land ◽  
Land Resources ◽  
Significant Potential ◽  
The Russian Federation

Представлен системный анализ использования земельных ресурсов в АПК и овощеводстве Российской Федерации, выявлены факторы, негативно влияющие на развитие овощеводства. Проведенный системный анализ дает представление об использовании земельных ресурсов в АПК и овощеводстве страны, обладающей значительным потенциалом земель с.-х. назначения.The system analysis of the use of land resources in agriculture and vegetable growing of the Russian Federation is presented, the factors negatively affecting the development of vegetable growing are revealed. The system analysis gives an idea of the use of land resources in agriculture and vegetable growing in the country, which has a significant potential for agricultural land.

scholarly journals Analysis of The Factors Affecting China's Food Security and The Countermeasures

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Fang Liu ◽  
◽  
Shuai Liu ◽  
Keyword(s):  
Food Security ◽  
Agricultural Land ◽  
Scientific Basis ◽  
Policy Formulation ◽  
Social Stability ◽  
Land Resources ◽  
Factors Affecting ◽  
Global Food Security ◽  
National Food Security ◽  
Global Food

Food security is the foundation of a country's social stability and economic development. This paper compares the global food security with China's food situation, summarizes the main problems of China's food security, and explores the factors that affect China's food security, including the shortage of agricultural land resources, the inability to meet the needs of food production, the rapid growth of food demand, the aggravation of the imbalance of food supply and the threat from the international market. Based on this, the paper puts forward suggestions of relevant policy to ensure national food security, in order to provide a scientific basis for the policy formulation of relevant government departments.

scholarly journals Productive soils as basis for effective agricultural land use in Carpathian region of Ukraine

2013 ◽  
pp. 257-264 ◽  
Author(s):  
Zinovii Pankiv
Keyword(s):  
Land Use ◽  
Key Words ◽  
Economic Performance ◽  
Agricultural Land ◽  
Arable Land ◽  
Integrated Approach ◽  
Agricultural Land Use ◽  
Land Resources ◽  
Carpathian Region ◽  
Definition Of

The structure of soils in Carpathian region of Ukraine, which is involved for agricultural land use, including for arable land, has been analyzed. The basic steps to increase the area of arable land have been described. Integrated approach with using spatial, legal, environmental, and economic performance has been proposed for definition of the efficiency of agricultural land use. The appellation “soil use” for characteristic the type using of agricultural land resources has been proposed. Key words: productive soils, land use, the Carpathian region of Ukraine, soil use

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