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The USDA Soil Taxanomy Classified Soil: Halplorthox/ Haplustox - Coursework Example

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"The USDA Soil Taxonomy Classified Soil: Halplorthox/ Haplustox" paper focuses on Haplorthox that is considered as a group of Andosols which are strong acid soils and have low levels of organic matter content and low levels of cation exchange capacity…
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The USDA Soil Taxanomy Classified Soil: Halplorthox/ Haplustox
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Download file to see previous pages At 600m above sea level, andosols were formed and below 600 sea level, latosols were formed (Dudal and Supraptohardjo, 1961, 1975). However, some andosols were formed in altitudes lower than 600 m sea level (Tan, 1960, 1984) These latosols were later classified as ultisols and oxisols under American classification (USDA classification) (Tan and Goenadi, 1994).

According to the modern classifications including USDA classification, the haplorthox group of soils has been categorized under haplustox. Hence both these terms can be considered as synonymous with each other.

Haplustox is a great group of the suborder Ustox and the order Oxisols, so to define the features of this great group of soils the features of Oxisols and Ustox must be laid down first as they are shared by all Haplustox soils.

Oxisols can be defined as highly weathered soils that are found primarily in the intertropical parts of the world and they contain few weatherable minerals and abundant in sesquioxides like Fe and Al oxide minerals (Beinroth, 1996). It is estimated that they occupy about 7-8% of the global ice-free land area. They pose a threat to soil fertility due to their extremely low native fertility resulting from very low nutrient reserves, low cation exchange capacity, and high phosphorus retention by oxide minerals. However, they become productive upon the addition of a reasonable quantity of inputs of lime and fertilizers.

Ustox can be defined as oxisols that have a ustic SMR with from 90 to 270 consecutive days of plant available moisture in the normal years. One or two crop growing seasons are possible each year. They represent 53% of all oxisols (S.W. Buol, 2006).

USDA soil taxonomy defines haplustox as the ustox that does not contain somber horizon within 150 cm of the mineral soil surface but that has, in all sub horizons of the anoxic horizon within 150 cm of the mineral soil surface. ...Download file to see next pagesRead More
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