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Phosphorus Fractions- Keys to Soil based P Management

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Title Phosphorus Fractions- Keys to Soil based P Management
 
Creator M. Chandrakala, C.A. Srinivasamurthy, V.R.R. Parama, S. Bhaskar, Sanjeev Kumar and D.V. Naveen
 
Subject phosphorus, fractions, Eastern dry zone, Karnataka, soils
 
Description RKVY funded project for PhD
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.
 
Date 2020-07-01T05:19:44Z
2020-07-01T05:19:44Z
2017-12-01
 
Type Research Paper
 
Identifier 2319-7706
http://krishi.icar.gov.in/jspui/handle/123456789/37867
 
Language English
 
Relation Not Available;
 
Publisher Excellent publisher