Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

PHOSPHORUS FRACTIONATION IN ACID SOIL OF LAKKATURA TEA GARDEN, SYLHET, BANGLADESH (Pages : 1 - 6)

Phosphorus (P) availability is affected in acid soils and hence it is important to monitor the distribution of P in acid soils. A study was undertaken to evaluate the distribution of P and its relationship with other nutrients. The soil samples were collected at 0-15 cm and 15-30 cm depths from 0 year, 20 year, 40 year and 60 year tea cultivated soils. The P fractions determined were total P, total organic P, total inorganic P and available P. The available P in soils was extracted with four different extractants viz. Olsen, Bray, Nelson and Morgan extractants. The different P fractions varied in their levels and also decreased in subsurface soils. In general, the P fractions were significantly and positively correlated with organic matter, total N and available S contents of soils and negatively correlated with soil pH. The total P content varied from 80.08 to 96.81 ppm at 0-15 cm depth and from 67.73 to 81.95 ppm at 15-30 cm depth in different soils. Among the soils the highest organic P (59.20 ppm) was found in soils of 40 years of tea cultivation. The inorganic P content of soils varied from 29.62 to 37.61 ppm at 0-15 cm depth and from 28.29 to 34.66 ppm at 15-30 cm depth. The organic and inorganic P constituted on an average 59.90% and 40.10% of total P, respectively. The available P content varied considerably with the variation of soils and extractants used. The highest available P content was observed in 40 year aged tea soil with all the extractants while 0 year round cultivated tea soil showed the lowest value. The P values extracted by different extractants followed the order of Bray-P>Nelson-P>Olsen-P>Morgan-P.Download