Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
yield. Improper spacing reduced yield up to 20-30% (IRRI, 1997). The optimum spacing
ensures the plant to grow in both aerial and underground parts through efficient utilization of
solar radiation and nutrients (Khan et al., 2005). Therefore, an attempt was made to test the
yield potential of five rice cultivars under direct-seeded conditions with narrow and wider
spacing.
Methodology
The experiment was conducted during the Kharif season of 2021 at the experimental farm of
Dhaanyaganga Krishi Vigyan Kendra, Ramakrishna Mission Ashrama, Sargachi. The
investigation was laid out in a split-plot design replicated thrice. The treatments comprised five
cultivars (Arize 6444, PHB 71, PRH 10, MTU 7029 and HUR 105) assigned to main plots.
Each main plot was further divided into two sub-plots to accommodate two crop geometry
treatments i.e. 20 × 10 and 25 × 25 cm 2 . A herbicide mixture of bispyribac sodium @ 25g ha -1
and Azimsulphuron @30 g ha -1 was also applied at 18 DAS to control weed flora. Plant height,
number of tillers m -2 and dry matter accumulation m -1 running row, leaf area index among crop
growth characters, yield attributing characters like panicle length, panicle weight, number of
effective tillers m -2 , number of grains panicle -1 and test weight. All the data obtained from the
experiment were statistically analyzed using the F-test (Gomez and Gomez, 1984).
Results
Cultivars
The maximum plant height and number of tillers m -2 were recorded in Arize 6444. It also had
significantly higher dry matter accumulation m -1 running row and leaf area index than PHB 71,
PRH 10, MTU 7029, and HUR 105. At 90 DAS, the plant height of PRH 10 was statistically
at par with Arize 6444 and in the case of a number of tillers, m -2 Arize 6444 became statistically
similar with PRH 10 and MTU 7029. In contrast, HUR 105 recorded lesser growth attributing
characters. Yield attributing characters like panicle weight, number of effective tillers m -2 ,
number of grains panicle -1 and test weight of Arize 6444 was significantly higher than other
cultivars. Yield attributes in HUR 105 were lesser in most of the characters like panicle length,
panicle weight, number of effective tillers m -2, and number of grains panicle -1 than the rest of
the cultivars. The minimum test weight was recorded in MTU 7029. Consequently, Arize 6444
recorded the highest grain yield. The higher values of yield attributes recorded in Arize 6444
than other cultivars were due to higher growth attributes and hybrid vigor.
Spacing
Square spacing (25 × 25 cm 2 ) recorded more plant height, dry matter accumulation, number of
tillers m -2 , and leaf area index in comparison to 20 × 10 cm 2 . Differences in plant height at both
spacings were statistically at par. However, significantly higher dry matter accumulation m -1
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