Phosphate Sorption and Its Relation to Soil Properties: the Use of Phosphate Sorption in Estimating Fertilizer Requirements, Agricultural University of Norway PDF Download
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Author: K.F. MOLAPONG
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Author: K.F. MOLAPONG
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Author: Edwin N. Qobose
Publisher: National Institute of Development Research & Documentation N
ISBN:
Category : Reference
Languages : en
Pages : 186
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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Author: Robert A. Pope
Publisher:
ISBN:
Category :
Languages : en
Pages : 164
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Definicao de fixacao de fosfato, formas de fosfato fixado por constituintes de solo inorganico. Amostra e preparacao de amostras, analises fisicas, analises quimicas, analises mineralogicas. Caracteristicas do solo. Estudos de absorcao de fosfato, criterio proposto por grupamento de solos, por caracteristicas de fixacao de fosfato.
Author: Kulendra Nath Das
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
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Category : Water
Languages : en
Pages : 496
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Author: Sergio Jorge Volkweiss
Publisher:
ISBN:
Category : Phosphates
Languages : en
Pages : 316
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The objectives of this research were to study the P sorption characteristics of soils and the effects of pH and of cation type and concentration on P sorption by soils and minerals. In an attempt to characterize the nature and properties of P sorption sites of soils, P sorption isotherms in a 0.1 N NaC1 system were obtained for six limed and unlimed agricultural soils from Rio Grande do Sul, Brazil. The equilibration time was 48 hours and the concentration of P in the final solution varied from near zero to 20 ugP/ml. Langmuir plots (c/x vs c) of the data resulted in curvilinear and/or multi-straight line relationships suggesting the presence of 2 or more populations of sites with different affinities for P. An iterative multiple regression analysis computer program that assumes that each population of site follows the Langmuir equation was used to analyze the sorption data. Three populations of sites with different affinities for P were detected and the Langmuir constants, k (binding energy term) and b (sorption maximum) were estimated for each population of sites. The median and range for values of k (ml/ug P) and b (ugP/g) for the three populations of site were in decreasing order of affinity for P:K1 = 140, (40-2870) and b1=120 (8-370); K2=2.4, (0.63-10) and b2=174, (25-704); and K3 =0.095, (0.051-0.27) and b3=763 (131-1460). On the average, the total number of P sorption sites (total) was made up of 10% of sites with high affinity for P, 22% with moderate and 68% with low affinity ...
Author: Carrie Anne Macijowsky Laboski
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Author: Yingming Liang
Publisher:
ISBN:
Category :
Languages : en
Pages : 414
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Author: Ronaldo Severiano Berton
Publisher:
ISBN:
Category : Fertilizers
Languages : en
Pages : 290
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The addition of organic residues to the soil may modify the amounts of plant available phosphorus (P) found in this ssytem. These studies were undertaken to evaluate the suitability of the sorption isotherm technique for estimating the amounts of inorganic P required for optimum plant growth, the correlation of P availability with the amount of P extracted by three chemical methods, and with the activity of two phosphatase enzymes, when soils were amended with organic materials. Acid phosphatase and phosphodiesterase activities were also compared with the P availability to plants. Soil phosphodiesterase activity correlated better with corn yield and plant uptake than acid phosphatase activity. The correlation of phosphodiesterase activity with microbial activity might be used to indicate the contribution of the soil organic P pool in the P supply to the plant.
