Revised Soil Phosphorus Test Ratings (RSPTR), Critical Limits (CL) and Phosphorous Recommendation for Maize

M. Ch; rakala; C.A. Srinivasamurthy; Sanjeev Kumar; S.Bhaskar; V.R.R. Parama; D.V. Naveen

doi:https://doi.org/10.20546/ijcmas.2017.611.034

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Original Research Articles Volume : 6, Issue:11, November, 2017

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Int.J.Curr.Microbiol.App.Sci.2017.6(11): 295-309

DOI: https://doi.org/10.20546/ijcmas.2017.611.034

Revised Soil Phosphorus Test Ratings (RSPTR), Critical Limits (CL) and Phosphorous Recommendation for Maize

M. Chandrakala^1*, C.A. Srinivasamurthy², Sanjeev Kumar³, S.Bhaskar⁴, V.R.R. Parama⁵ and D.V. Naveen⁶

¹National Bureau of Soil Survey and Land Use Planning, Regional Centre, Hebbal, Bangalore-560 024, Karnataka, India
²Director of Research, Central Agricultural University, Imphal, Manipur, India
³National Dairy Research Institute, Karnal Haryana 132001
⁴ADG, NRM Division, New Delhi, India
⁵Dept. Soil Science and Agricultural Chemistry, UAS, Bangalore-560 065, Karnataka, India
⁶Deptartment of Soil Science and Agricultural Chemistry, Sericulture College,Chintamani, Karnataka, India

^*Corresponding author

Abstract:

The current soil test phosphorous ratings of low, medium and high fertility classes and critical limits were revised by studying the response of maize in 24 soils of varied initial P fertility, treated with graded levels of P. The revised SPTR were <15.50, 15.51-28.00, 28.10-48.50 and >48.50 kg P2O5 ha-1, VL: L: M: H, respectively. CL for soil was 17.0 kg P2O5 ha-1 and 0.12 per cent for plant. Maize yield can be maximized by recommending phosphorous @ 150, 125, 100 and 75 percent of the recommended dose in the respective soils of VL: L: M: H fertility ratings.

Keywords: Soil available phosphorus ratings, Revalidation, Critical limits, Maize.

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How to cite this article:

Chandrakala, M., C.A. Srinivasamurthy, Sanjeev Kumar, S. Bhaskar, V.R.R. Parama and Naveen, D.V. 2017. Revised Soil Phosphorus Test Ratings (RSPTR), Critical Limits (CL) and Phosphorous Recommendation for Maize.Int.J.Curr.Microbiol.App.Sci. 6(11): 295-309. doi: https://doi.org/10.20546/ijcmas.2017.611.034

Copyright: This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.

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