National Academy of Agricultural Sciences (NAAS)
|
PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
To evaluate ABDTPA, a multi nutrient extractant for simultaneous assessment of available P, K, S, Fe, Mn, Zn and Cu, 50 soil samples with wide range of pH were collected and analysed with ABDTPA and established standard methods. A pot culture experiment with maize crop was conducted to correlate the nutrients extracted by extractants with plant uptake. Correlation and regression analysis were carried out separately for each nutrient for acid, alkaline, neutral and all soils to obtain the relationship between amount of nutrients extracted by different methods and also with plant uptake. The results revealed that ABDTPA extractant is suitable for determination of available P in neutral (r=0.946*** with Olsen-P) and alkaline soils (r=0.607*** with Olsen-P) than acid soils (r=0.450NS with Bray-P). Regarding available S, ABDTPA extractant is suitable only for alkaline soils (r=0.870*** with CaCl2-S). ABDTPA extractant can be used for the determination of available K (r=0.865*** with NH4OAc – K), Fe (r=0.982*** with DTPA-Fe), Mn (r=0.832*** with DTPA-Mn), Zn (r=0.952*** with DTPA-Zn) and Cu (r=0.918*** with DTPA-Cu) content of soils in all the pH ranges. Further, correlation of nutrients extracted by extractants with that of plant uptake showed ABDTPA method is suitable for the determination of available P and S content of alkaline soils (r=0.723* and 0.739* respectively) and not a reliable method for acid soils (r=0.464NS and -0.111 NS respectively). For K and micronutrients (Fe, Mn and Zn), ABDTPA and standard methods correlated in a similar manner with plant uptake. Hence, it can be concluded that ABDTPA can be used as a multinutrient extractant for the simultaneous extraction of P, K, S, Fe, Mn, Zn and Cu in alkaline soils.
Citations |
 |
 |
 |
 |
