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.)
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Creator |
BHAVANI, GARA
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Contributor |
MARTIN LUTHER, M
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Subject |
application methods, yields, developmental stages, rice, grain, planting, crops, inorganic acid salts, biological development, land resources
SOIL, PHOSPHORUS, RICE, Oryza sativa L. |
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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. |
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Date |
2016-05-31T14:34:54Z
2016-05-31T14:34:54Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66490
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Language |
en
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Relation |
D9004;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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