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Comparative Performance of Rice with System of Rice Intensification (SRI) and Conventional Management using Different Plant Spacings

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Title Comparative Performance of Rice with System of Rice Intensification (SRI) and Conventional Management using Different Plant Spacings
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Creator A. K. Thakur
S. Rath
S. Roychowdhury
N. Uphoff
 
Subject leaf area index
light interception
plant spacing
rice
SRI
 
Description Not Available
The System of Rice Intensification (SRI) reportedly enhances the yields of rice (Oryza sativa L.) through synergy among several agronomic management practices. This study was conducted to investigate the effects on rice plant characteristics and yield by comparing the plants grown with different methods of cultivation – SRI vs. recommended management practices (RMP) focusing on the impact of different plant spacings. Performance of individual hills was significantly improved with wider spacing compared with closer-spaced hills in terms of root growth and xylem exudation rates, leaf number and leaf sizes, canopy angle, tiller and panicle
number, panicle length and grain number per panicle, grain filling and 1000-grain weight and straw weight, irrespective of whether SRI or RMP was employed. Both sets of practices gave their highest grain yield with the spacing of 20x20 cm; however, SRI yielded 40 % more than the recommended practice. At this spacing, canopies also had the highest leaf area index (LAI) and light interception during flowering stage. The lowest yield was recorded at 30x30 cm spacing under both the practices, as a result of less plant population (11 /m2), despite improved hill performance. During the ripening stage, hills with wider spacing had larger root dry
weight, produced greater xylem exudates, and transported these towards shoot at faster rates. These features contributed to the maintenance of higher chlorophyll levels, enhanced fluorescence and photosynthesis rates of leaves and supported more favourable yield attributes and grain yield in individual hills than in closely-spaced plants. Moreover, these parameters further improved in SRI, apart from the enhanced percentage of effective tillers and showed substantial and positive impacts on grain yield (17 %) compared with recommended practice. In conclusion, wide spacing beyond optimum plant density, however, does not give higher grain yield on an area basis and for achieving this, a combination of improved hills with optimum plant population must be worked out for SRI.
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Date 2018-07-26T06:51:56Z
2018-07-26T06:51:56Z
2010-03-07
 
Type Research Paper
 
Identifier 101
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http://krishi.icar.gov.in/jspui/handle/123456789/6299
 
Language English
 
Relation Not Available;
 
Publisher Wiley Online Library