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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(11): 281-294
DOI: https://doi.org/10.20546/ijcmas.2017.611.033


Phosphorus Fractions- Keys to Soil based P Management
M. Chandrakala1*, C.A. Srinivasamurthy2, V.R.R. Parama3, S.Bhaskar4, Sanjeev Kumar5 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
3 Department Soil Science and Agricultural Chemistry, UAS, Bangalore-560 065,Karnataka, India
4Department of Agronomy, UAS, Bangalore-560 065, Karnataka, India
5NDRI, Karnal, India
6Deptartment of Soil Science and Agricultural Chemistry, Sericulture College,Chintamani, Karnataka, India
*Corresponding author
Abstract:

Red soils (Alfisols) of Karnataka are low in total and available phosphorus (P). When soluble P sources are added, undergo transformation into unavailable forms with time. Native P compounds, some being highly insoluble are unavailable for plant uptake. Thus, knowing the changes in P fractions in different soils is much important for P recommendation. The objective of the study was to find out the fate of the applied phosphorus in soils of different P fertility in a finger millet-maize cropping system. An experiment with creation of five P fertility gradient strips (Very low, Low, Medium, High and Very high) in one and the same field followed by response of finger millet and maize crops to graded levels of P was undertaken at UAS, Bangalore. Soil P fractions were determined in a soil after the harvest of maize in a finger millet- maize cropping system. There was an increase in total-P, organic-P, reductant soluble-P, occluded-P and calcium-P fractions with the increased gradient strips from very low to very high applied with levels of P. Whereas, saloid-P, aluminium-P and iron-P are the slowly and plant available labile-P forms which were decreased as the P fertility gradients and dose of P addition increased. There was a direct relationship with addition, fixation and distribution of P fractions. Hence, continuous P fertilization can be restricted in soils of high and very high initial P status as the PUE was 20-40 per cent only in general leads to build-up and transformation in to non-labile P forms.


Keywords: Fertility gradients, Finger millet – maize cropping system, Graded levels of P, Soil phosphorus fractions.
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How to cite this article:

Chandrakala, M., C.A. Srinivasamurthy, V.R.R. Parama, S. Bhaskar, Sanjeev Kumar and Naveen, D.V. 2017. Phosphorus Fractions- Keys to Soil based P Management.Int.J.Curr.Microbiol.App.Sci. 6(11): 281-294. doi: https://doi.org/10.20546/ijcmas.2017.611.033