Evaluation of Multi Nutrient Extractant – Ab-Dtpa with Olsens in Varying P Status Soils

An experiment was conducted at AICRP on STCR, ARI, Rajendranagar, Hyderabad to evaluate the performance of multinutrient extractant AB-DTPA in comparison with the standard method (Olsen's method) during 2019-20.Geo-referenced surface soil samples were collected through a random sampling technique from in and around Ranga Reddy district of Telangana.These soils were screened for available phosphorus status and thirty soil samples were collected with ten samples from each category viz., low, medium and high phosphorus fertility levels.-1The amount of available phosphorus extracted by Olsen's extractant (112 kg ha ) was -1 found to be numerically more compared to AB-DTPA extractant (82 kg ha ).The correlation coef icient between Olsen's and AB-DTPA extractant during estimation of available P in varying native phosphorus status soils was found to be 0.84** in low P soils, medium P soils (r = 0.86**) and high P soils was (r = 0.87**) while in case of overall soils it was found to be (r = 0.94**).It can be concluded that Olsen's and AB-DTPA extractable phosphorus were equally good indices for estimating available phosphorus.Hence, AB-DTPA can be used as an extractant for the estimation of available P in neutral and alkaline soils.