Abstract
The present study was carried out to investigate the effects of salinity level on different forms of inorganic phosphorus (P) transformation in three different soil series such as Amjhupi, Gopalpur and Bajoa located in Ganges River Floodplain. Two non-saline soils and one slightly saline soil with different textural classes were collected from these sites. The salinity treatments were 0, 6, 10 and 13 dSm-1 with three replications. The treated soils were then incubated in laboratory at field capacity moisture condition. To determine the transformation of different forms of inorganic P, sampling was done for 0, 14, 21, 42 and 84 days. Different forms of inorganic P such as soluble and exchangeable phosphorus (SE-P), iron and aluminium bound phosphorus (Fe and Al-P), calcium bound phosphorus (Ca-P) and residual phosphorus (RE-P) were determined. For Amjhupi soil series, the sequence of different forms of inorganic P was RE-P>Ca-P>Fe and Al-P>SE-P according to their amount. For Gopalpur and Bajoa soil series, the sequence was Ca- P>RE-P>Fe and Al-P>SE-P and RE-P>Ca-P>Fe and Al-P>SE-P, respectively. The sequence clearly indicates that the soluble and exchangeable P decreases with time due to salinity which reduces the uptake of P and ultimately reduces the yield. The changes were statistically significant (p<0.0001) in case of all three soils.Jahangirnagar University J. Biol. Sci. 5(1): 71-79, 2016 (June)
Highlights
Soil salinity is distributed throughout the world especially in the arid and semi-arid regions, where agriculture performs under irrigation (Pessaraki & Szaboles, 1999)
soluble and exchangeable phosphorus (SE-P) were extracted from each soil samples with 40 ml 2 M KCl for 2 hours at room temperature with continuous agitation, Fe and Al-P were extracted from the residue of the first fraction of each soil samples with 40 ml 0.1 M NaOH for 17 hours with continuous agitation, Calcium bound P were extracted from the residue of second fraction of each soil samples with 40 ml 0.5 M HCl for 24 hours with continuous agitation and residual phosphorus (RE-P) were extracted from the last fraction of each soil samples from digestion with 5:2 mixtures of concentrated HNO3 and HClO4
Soluble and Exchangeable Phosphorus (SE-P): SE-P contents of the soils varied with time after the application of different levels of salinity treatments
Summary
Soil salinity is distributed throughout the world especially in the arid and semi-arid regions, where agriculture performs under irrigation (Pessaraki & Szaboles, 1999). To determine the transformation of different forms of inorganic P, sampling was done for 0, 14, 28, 42 and 84 days from the incubated soils. Soluble and Exchangeable Phosphorus (SE-P): SE-P contents of the soils varied with time after the application of different levels of salinity treatments.
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