Influence of soil particle size and grinding on bray-2 extractable phosphorus
Titel:
Influence of soil particle size and grinding on bray-2 extractable phosphorus
Auteur:
Takahashi, S.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 27 (1996) nr. 15-17 pagina's 2829-2835
Jaar:
1996-09
Inhoud:
The influence of soil particle size and soil fine grinding on Bray-2 extractable phosphorus (Bray-2P) was studied. Air-dried and 2-mm mesh-sieved soil was separated into six particle size classes: <0.075, 0.075-0.106, 0.106-0.25, 0.25-0.425, 0.425-0.85, and 0.85-2 mm. The lowest amounts of Bray-2P were found in the 0.425-0.85 and 0.85-2 mm fractions and the highest in <0.075 mm fraction. When ground for 3 min, the amount of Bray-2P increased in the fractions larger than 0.25 mm, whereas it decreased in the fractions smaller than 0.25 mm. In the large fraction (0.425-0.85 mm), grinding for 1 to 3 min led to an increase in the amount of Bray-2P, but grinding for 9 to 18 min caused a decrease. In contrast, in the small fraction (<0.075 mm), the amount of Bray-2P decreased by grinding for 1 min. The large and small fractions that were ground absorbed P in proportion to the grinding time during the extraction-filtration period.
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