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BIOLOGICAL MINING OF SOIL RESERVE PHOSPHORUS IN LOWLAND RICE (Oryza sativa L.)

KrishiKosh

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Title BIOLOGICAL MINING OF SOIL RESERVE PHOSPHORUS IN LOWLAND RICE (Oryza sativa L.)
 
Creator BHAVANI, GARA
 
Contributor MARTIN LUTHER, M
 
Subject application methods, yields, developmental stages, rice, grain, planting, crops, inorganic acid salts, biological development, land resources
SOIL, PHOSPHORUS, RICE, Oryza sativa L.
 
Description A field experiment entitled “Biological mining of soil reserve phosphorus
in lowland rice (Oryza sativa L.)” during kharif, 2009-10 was conducted on
sandy clay loam soils of the Agricultural College Farm, Bapatla. The treatments
consisted of four levels of phosphorus (P 0- no phosphorus, P1- 20 kg P2O5 ha-1,
P2- 40 kg P2O5 ha-1 and P3- 60 kg P2O5 ha-1) and four biological/ organic
treatments (T0- no inoculation, T1- PSB @ 5 kg ha-1, T2- VAM @ 10 kg ha-1 and
T3- greenmanuring in-situ) arranged in a randomized block design with factorial
concept and replicated thrice. The crop was transplanted on 25-09-2009 and
harvested on 08-01-2010.
All the biological sources increased plant height on a par with each other
at each level of phosphorus, but inoculation of PSB along with 60 kg P2O5 ha-1
produced the tallest plants which were significantly superior to the rest of the
treatment combinations.
Inoculation of PSB along with application of phosphorus increased the
tiller number significantly over VAM and no inoculation, but, it was on a par
with that of green manuring in-situ. The tiller number recorded with PSB
inoculation without phosphorus was on a par with 60 kg P2O5 ha-1 without
inoculation.
The highest drymatter accumulation was recorded with application of 60
kg P2O5 ha-1 along with PSB inoculation followed by greenmanure
incorporation. However, difference in drymatter accumulation at every
biological source was not significant at each level of phosphorus application
from 0 to 60 kg P2O5 ha-1.
Yield attributes like productive tillers m-2 and filled grains per panicle of
rice were significantly influenced by application of 60 kg P2O5 ha-1 over rest of
the P levels. Among biological sources, soil inoculation of PSB significantly
recorded the maximum number of filled grains per panicle and productive tillers
m -2 followed by greenmanure incorporation and VAM inoculation. Application
of 60 kg P2O5 ha-1 recorded significantly the highest test weight over rest of the
treatments. The 1000 grain weight with 60 kg P 2O5 ha-1 was the maximum
compared to those of other levels of phosphorus.
The maximum grain yield recorded at 60 kg P2O5 ha-1 was on a par with
that of 40 kg P 2O5 ha-1 with each biological/ organic treatment, whereas straw
yield recorded at 60 kg P 2O5 ha-1 was found on a par with 40 and 20 kg P2O5 ha-1
with each biological treatment. Inoculation of PSB recorded the highest grain
and straw yields at each level of P application, however, it was on a par with
other biological treatments.
The maximum P uptake was recorded with application of 60 kg P2O5 ha-1
(P3) and it was significantly superior to rest of the P levels. At 60 and 90 DAT
soil inoculation of PSB recorded significantly the maximum P uptake over other
biological treatments, but remained comparable with that of greenmanuring in-
situ (T3) at 30 DAT and at maturity.
The maximum Apparent Phosphorus Recovery (APR) and Phosphorus
Use Efficiency (PUE) was recorded with inoculation of PSB along with 20 kg
P2O5 ha-1 (38.1%) followed by greenmanure incorporation (29.2%) and VAM
inoculation (22.5%) at the same level of P.
The maximum available P at 60 kg P2O5 ha-1 was with inoculation of PSB
but the differences among biological sources were not significant at 40 and 60
kg P2O5 ha-1 with respect to available P status of soil.
The maximum net returns (Rs. 40332 ha-1) were obtained with
application of 60 kg P2O5 ha-1 along with PSB inoculation and the highest
benefit cost ratio was with soil inoculation of PSB along with 60 kg P2O5 ha-1
(2.5) followed by PSB inoculation along with 20 and 40 kg P 2O5 ha-1 (2.4).
Overall, the results shows that application of phosphorus in combination
with biofertilizers and organic manure was superior compared to its application
alone. Inoculation of PSB @ 5 kg ha-1 along with 60 kg P2O5 ha-1 was found
better over other combinations of biological sources increasing growth, yield
and nutrient uptake of rice.
 
Date 2016-05-31T14:34:54Z
2016-05-31T14:34:54Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66490
 
Language en
 
Relation D9004;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY