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Organic matter and exchangeable aluminum interactions in soils cultivated with coffee (Coffea arabica)
Quiñonez-González, Katherine
Quiñonez-González, Katherine
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Abstract
Cuatro suelos ácidos de Puerto Rico fueron evaluados para determinar la cantidad de Al3+ extraÃble utilizando soluciones de 1 M KCl, 0.33 M LaCl3 y 0.5 M CuCl2. Los suelos evaluados fueron Alonso (Oxic Dystrudepts), Consumo (Typic Haplohumults), Corozal (Typic Hapludults) y Humatas (Typic Haplohumults). Muestras de suelo fueron tomadas de 0-20 y 20-40 cm de profundidad. El Al3+ extraÃdo fue determinado por espectroscopÃa de absorción atómica (AAS). El pH varió de 4.43 a 5.76, siendo menor de 20-40 cm de profundidad. El contenido de material orgánica varió de 0.86 a 3.51%, siendo menor de 20-40 cm de profundidad. La solución de 0.5 M CuCl2 extrajo la mayor cantidad de Al3+, seguido por 0.33 M LaCl3 y 1 M KCl a 0-20 cm de profundidad en todos los suelos. La solución de 0.33 M LaCl3 extrajo cantidades similares de Al3+ en los suelos Corozal y Humatas de 20-40 cm de profundidad. El menor contenido de Al3+ se observó en Alonso de 20-40 cm de profundidad, con un promedio de 0.02, 0.43 y 1.92 cmolc kg-1 con 1 M KCl, 0.33 M LaCl3 y 0.5 M CuCl2, respectivamente. La mayor cantidad de Al3+ extraÃdo se observó en Corozal de 20-40 cm de profundidad, con un promedio de 13.2, 13.1 y 15.6 cmolc kg-1 con 1 M KCl, 0.33 M LaCl3 y 0.5 M CuCl2, respectivamente. Las soluciones de 0.33 M LaCl3 y 0.5 M CuCl2 extrajeron cantidades similares de Al3+ de 20-40 cm de profundidad, donde se encontraba el menor contenido de materia orgánica.
Four acid soils from Puerto Rico were evaluated for their extractable Al3+ with 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2 solutions. The soils included in the study were Alonso (Oxic Dystrudepts), Consumo (Typic Haplohumults), Corozal (Typic Hapludults), and Humatas (Typic Haplohumults). Soil samples were collected at 0-20 and 20-40 cm depths. Extractable Al3+ was determined by Atomic Absorption Spectroscopy. Soil pH ranged from 4.43 to 5.76 and was lower at the 20-40 cm depth. Soil organic matter content ranged from 0.86 to 3.51% and was lower at the 20-40 cm depth. The 0.5 M CuCl2 solution extracted the highest amount of Al3+, followed by 0.33 M LaCl3, and 1 M KCl, at the 0-20 cm depth in all soils. At 20-40 cm depth LaCl3 extracted similar amounts of Al3+ from Corozal and Humatas soils. The lowest content of extractable Al3+ at 20-40 cm depth was observed on Alonso soil, with an average of 0.02, 0.43, and 1.92 cmolc kg-1 for 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2, respectively. The highest amount of extractable Al3+ at 20-40 cm depth was observed on Corozal soil, with an average of 13.2, 13.1, and 15.6 cmolc kg-1 for 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2, respectively. The 0.33 M LaCl3 and 0.5 M CuCl2 solutions extracted similar amounts of Al3+ at the 20-40 cm depth, where lower organic matter content was present.
Four acid soils from Puerto Rico were evaluated for their extractable Al3+ with 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2 solutions. The soils included in the study were Alonso (Oxic Dystrudepts), Consumo (Typic Haplohumults), Corozal (Typic Hapludults), and Humatas (Typic Haplohumults). Soil samples were collected at 0-20 and 20-40 cm depths. Extractable Al3+ was determined by Atomic Absorption Spectroscopy. Soil pH ranged from 4.43 to 5.76 and was lower at the 20-40 cm depth. Soil organic matter content ranged from 0.86 to 3.51% and was lower at the 20-40 cm depth. The 0.5 M CuCl2 solution extracted the highest amount of Al3+, followed by 0.33 M LaCl3, and 1 M KCl, at the 0-20 cm depth in all soils. At 20-40 cm depth LaCl3 extracted similar amounts of Al3+ from Corozal and Humatas soils. The lowest content of extractable Al3+ at 20-40 cm depth was observed on Alonso soil, with an average of 0.02, 0.43, and 1.92 cmolc kg-1 for 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2, respectively. The highest amount of extractable Al3+ at 20-40 cm depth was observed on Corozal soil, with an average of 13.2, 13.1, and 15.6 cmolc kg-1 for 1 M KCl, 0.33 M LaCl3, and 0.5 M CuCl2, respectively. The 0.33 M LaCl3 and 0.5 M CuCl2 solutions extracted similar amounts of Al3+ at the 20-40 cm depth, where lower organic matter content was present.
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Date
2007
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Coffee plantations, Soil climate, P. carbonarium