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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.
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Creator Chandrakala, M., Srinivasamurthy, C.A., Parama, V.R.R., Bhaskar, S., Sanjeev Kumar and Naveen, D.V., 2017.
 
Subject Fertility gradients, Finger millet – maize cropping system, Graded levels of P, Soil phosphorus fractions.
 
Description Not Available
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.
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Date 2019-12-28T10:47:51Z
2019-12-28T10:47:51Z
2017-01-01
 
Type Research Paper
 
Identifier Not Available
2319-7706
http://krishi.icar.gov.in/jspui/handle/123456789/29183
 
Language English
 
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Publisher Not Available