Performance of rice varieties at different spacing grown by the system of rice intensification in eastern India
2009
Thakur, A.K. | Chaudhari, S.K. | Singh, R. | Kumar, Ashwani
A field study was carried out during the rainy seasons of 2005 and 2006 on sandy clay-loam soil at Deras Research Farm, Mendhasal in Khurda district, Orissa to evaluate the performance of 3 different duration rice (Oryza sativa L.) varieties, viz. 'Khandagiri' (short-duration, 100 days), 'Surendra' (medium-duration, 125 days) and 'Savitri' (longgduration, 150 days) under different spacing in system of rice intensification and compared with the conventional method. The results suggested that the optimum spacing under system of rice intensification in short-and medium-duration varieties was 20 cmx20 cm and for long-duration variety 25 cmx25 cm in terms of grain yield. At the spacing of 20 cmx20 cm, short-and medium-duration varieties gave 46.8 and 41.9% grain yield increase compared to conventional method. Long-duration variety gave 31.2% more grain yield in system of rice intensification than the conventional system at 25 cmx25 cm spacing. In different varieties, yield reduction at wider spacing was mainly due to less number of panicles/m2. Thin tillers, short panicles with less number of grains were responsible for reduction in grain yield at narrow spacing in system of rice intensification.
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