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EFFECT OF PIGEONPEA (Cajanus cajan) RHIZOSPHERE ON PHOSPHORUS TRANSFORMATION UNDER VARYING TILLAGE AND CROP RESIDUE MANAGEMENT PRACTICES.

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Title EFFECT OF PIGEONPEA (Cajanus cajan) RHIZOSPHERE ON PHOSPHORUS TRANSFORMATION UNDER VARYING TILLAGE AND CROP RESIDUE MANAGEMENT PRACTICES.
M Sc
 
Creator AMRIT LAL MEENA
 
Contributor R. N. Pandey
 
Subject hybrids, heterosis, diseases, fruits, crossing over, developmental stages, planting, vegetables, exhibitions, biological phenomena
 
Description T-8298
In the present investigation effects of tillage and crop residues management practices
were examined on soil phosphorus transformation in pigeonpea rhizosphere and nonrhizosphere
soil on a sandy loam soil (Typic Haplustept). The experiment was laid
out in split plot design in which tillage viz. conventional tillage flat bed (CT-F),
conventional tillage raised bed (CT-B), zero tillage flat bed (ZT-F) and zero tillage
raised bed (ZT-B) were main plot treatments and different crop residue management,
viz. (i) No residue (R0), (ii) Residue of pigeonpea and wheat (RP+W), (iii) Residue of
pigeonpea (RP), and (iv) residue of wheat (RW) were sub-plot treatments. Collected
rhizosphere and non-rhizosphere soil samples at 90 days of pigeonpea sowing were
analyzed for P fractions (sequential extraction procedure) and Phosphatase enzyme
activity. Depletion in solution-P (0.05 M CaCl2 extractable) content under all the
treatments in rhizosphere soil indicated appreciable uptake from rhizosphere by
plants as compare to non-rhizosphere soil. Tillage and crop residue management
caused significant change in NaHCO3-P and NaOH-Pi fraction of both rhizosphere
and non-rhizosphere soils and the highest content of both the fractions were observed
in ZT-B with Rp+w. However, CT-B with Rp+w was statistically at par with ZT-F
with R0. Results showed a significant difference of different phosphorus fractions
between zero tillage and conventional tillage, zero tillage had significantly higher
labile as well as non-labile P content in pigeonpea rhizosphere and non-rhizosphere
soil. Acid-P content of non-rhizosphere soil in conventional tillage decreased from
its initial content (560 kg ha-1) which suggested the transformation of Ca bound P
(non-labile) of surface soil to other labile phosphorus fractions and subsequent
utilization by crops. Residual-P fraction of both rhizosphere and non-rhizosphere soil
was non-significantly affected due to tillage and crop residue management practices
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and it remain more or less same as initial soil content, which shows that residual-P is
a highly non-labile and humus bound fraction of phosphorus which is not easily
transformed due to tillage and crop residue management practices and also by
pigeonpea rhizosphere. The highest acid and alkaline Phosphatase enzymes activity
were found higher in ZT-B with Rp+w in rhizosphere soil as compare to nonrhizosphere
soil.
 
Date 2016-10-19T10:21:54Z
2016-10-19T10:21:54Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80944
 
Format application/pdf
 
Publisher IARI, DIVISION OF SOIL SCIENCE AND AGRICULTURAL CHEMISTRY