%0 Journal Article
%T Extractable Phosphorus Contents of Some Soils of Bangladesh and Their Correlation with Phosphorus Concentration in Rice Leaves
%A Enamul Haque
%A Abul Kashem
%A Khan Towhid Osman
%J Open Journal of Soil Science
%P 115-122
%@ 2162-5379
%D 2013
%I Scientific Research Publishing
%R 10.4236/ojss.2013.32013
%X <p class=\"MsoNormal\" style=\"text-align:justify;\">
	<span lang=\"EN-US\">To observe the availability of
phosphorus by different extraction methods in some cultivated soils of
Hathazari Upazilla of Chittagong District, this study was carried out with 36
surface soil samples (0</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">-</span><span lang=\"EN-US\"> </span><st1:chmetcnv unitname=\"cm\" sourcevalue=\"15\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><span lang=\"EN-US\">15 cm</span></st1:chmetcnv><span lang=\"EN-US\">) belonging to six soil series, namely Bijipur,
Pahartali, Mirsarai, Manu, Raojan and Noapara. Physical and chemical
characteristics of the soils were also determined with an objective of
identifying the soil factor(s) regulating P extractability. Three P extraction
methods, namely Olsen (<st1:chmetcnv unitname=\"m\" sourcevalue=\".5\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><st1:chmetcnv unitname=\"m\" sourcevalue=\".5\" hasspace=\"False\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\">0.5 </st1:chmetcnv>M</st1:chmetcnv>
NaHCO<sub>3</sub>, pH 8.5), Mehlich-3 (0.2 N CH<sub>3</sub>COOH + 0.013 N HNO<sub>3</sub> + 0.015</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">N NH<st1:chmetcnv unitname=\"F\" sourcevalue=\"4\" hasspace=\"False\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><sub>4</sub>F</st1:chmetcnv> + 0.25</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">N NH<sub>4 </sub>NO<sub>3</sub> + <st1:chmetcnv unitname=\"m\" sourcevalue=\".001\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><st1:metricconverter productid=\"0.001 M\" w:st=\"on\">0.001 M</st1:metricconverter></st1:chmetcnv>
EDTA) and Bray &amp; Kurtz-1 (0.03</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">N NH<st1:chmetcnv unitname=\"F\" sourcevalue=\"4\" hasspace=\"False\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><sub>4</sub>F</st1:chmetcnv>
+ 0.025</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\">N HCl) were used.
There was a wide variation in the extractability of P ranging from low to high
categories. Olsen method extracted the largest amount of P (2.07 - 45.36 mg¡¤kg<sup>-1</sup>)
while Bray &amp; Kurtz-1 extracted the smallest amount (1.02 - 21.79 mg¡¤kg<sup>-1</sup>). The mean extractable P in soils was
found to be in the order of Olsen &gt; Mehlich-3 &gt; Bray &amp; Kurtz-1. Soil
pH was the most dominant factor in determining P extractability. Available P
was negatively correlated with
%K Soil Series
%K Available P
%K Olsen P
%K Mehlich-3 P
%K Bray &amp
%K Kurtz-1 P
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=32587