Performance of rice (Oryza sativa L.) hybrids at varying fertility levels under aerobic conditions.
Loading...
Date
2022-11-28
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CSK HPKV, Palampur
Abstract
A field experiment was undertaken during kharif 2021 at the Experimental Farm of Department of
Agronomy, CSK Himachal Pradesh Krishi Vishwavidyalaya, Palampur (H.P.) with the objective of
studying performance of rice (Oryza sativa L.) hybrids at varying fertility levels under aerobic
conditions. The experiment was conducted in split plot design with three fertility levels (75 %, 100%
and 125 % of the recommended dose of fertilizers, RDF 90:40:40 kg NPK ha-1
) in main plot and four
varieties (Arize AZ 6508, PAC 807+
, Arize 6129 and HPR 2143) in subplot, the treatments being
replicated thrice. The soil of the experimental site was silty clay loam in texture, acidic in reaction and
medium in available nitrogen, phosphorus and potassium and had adequate DTPA extractable zinc. The
results so obtained in this investigation clearly indicated the significant impact of fertility levels on the
growth, development, yield attributes and yield of different rice varieties cultivated under aerobic
conditions. The varieties also showed significant differences in terms of all the growth, development
and yield indices though the interaction between the fertility levels and varieties were not found to be
significant. Application of 125% RDF, remaining at par with 100 % RDF, gave significantly higher
values for almost all the yield attributes viz., number of effective tillers (298.3), number of grains per
panicle (74.8) and 1000-grain weight (23.69) which ultimately resulted in significantly higher grain
(38.29 q ha-1
) and straw yield (48.36 q ha-1
) of rice. This treatment also proved to be the most economic
one giving higher gross return (Rs 91,075 ha-1
), net return (Rs 42,009 ha-1
) and B:C ratio (0.87).
Application of 75 % RDF gave significantly lower yield as well as economic returns. Application of
higher dose of fertilizers also increased the nitrogen, phosphorus and potassium content in both grain
and straw resulting in their higher uptake of respective nutrients. The available nitrogen and phosphorus
content in soil after the harvest of rice was significantly influenced by fertility levels with significantly
higher values reported with the application of higher doses while application of lower dose of 75 %
RDF resulted in significantly lower available nitrogen and phosphorus. Amongst the varieties PAC 807+
gave better results in term of grain yield (39.20 q ha-1
), gross return (Rs 91,033 q ha-1
) and net return
(Rs 40,633 q ha-1
) while the inbred check variety HPR 2143 gave lowest grain yield (31.42 q ha-1
) but
highest B:C ratio (0.95). Thus farmers can get more productivity of aerobic rice with the cultivation of
hybrids with application of higher dose of fertilizers though for achieving higher profitability the
farmers should go in for the cultivation of open pollinated check variety HPR 2143 at higher doses of
fertilizers.