Abstract:
A laboratory evaluation and an uptake study using Neubauer seedling
technique was carried out for evolving a single common extractant suitable for
extracting available P and available Kso as to simplify the process of extracting these
available plant nutrients in soil testing work. The study was conducted in three
phases, viz., an initial study, preliminary screening and a final selection using
different extractants. The triacid (0.06 N H2S04 + 0.05 N HCI + 0.05 A/ oxalic
acid) with a soil solution ratio of 1 :1 0 and equilibration period of 30 min was found
to give very good correlation with Bray No. 1 P and NH4OAc (std) K and this
extractant can be recommended for different soils of the state.
