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Performance of cultivated indica rice (Oryza Sativa L.) as affected by weedy rice

Published online by Cambridge University Press:  31 January 2019

Sushmita Munda*
Affiliation:
Crop Production Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
Sanjoy Saha
Affiliation:
Crop Production Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
Totan Adak
Affiliation:
Crop Protection Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
Nitiprasad Jambhulkar
Affiliation:
Social Science Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
Priyadarsini Sanghamitra
Affiliation:
Crop Improvement Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
Bhaskar Chandra Patra
Affiliation:
Crop Improvement Division, National Rice Research Institute (ICAR), Cuttack, Odisha 753 006, India
*

Abstract

Weedy rice species exhibit differential competitive ability and cause significant losses to rice yield. The present study was conducted to evaluate the competing ability of weedy rice accessions collected from foothills of eastern Himalayas and coastal Odisha grown in the presence of cultivated indica rice var. Swarna. The competitive ability of Swarna and weedy rices were estimated on the basis of (i) Swarna yield reduction under different durations of competition with weedy rice; and (ii) nutrient uptake by Swarna and weedy rice in competitive environment. There was significant yield reduction (18%) when competition was allowed until 6 weeks after emergence (WAE) compared to competition until 2 WAE, which was due to vigorous growth of weedy rice at early vegetative stage. The biomass accumulation and tiller number of weedy rice were significantly higher compared to Swarna. Odisha weedy rice accession recorded about 18, 57 and 24% higher N, P and K uptake, respectively, than Swarna. The highest yield reduction (22%) in Swarna was recorded when grown with OA1 and the lowest impact (7.7%) was recorded with AA2. As conclusion, management practices should be implemented within 2–4 weeks of emergence considering 5–10% acceptable yield loss of Swarna, and grain yield of cultivated rice was reduced significantly by high N and K uptake by weedy rice under a competitive environment.

Type
Research Article
Copyright
© Cambridge University Press 2019 

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