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Indian Journal of Agronomy
Year : 2017, Volume : 62, Issue : 3
First page : ( 315) Last page : ( 320)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Effect of irrigation and methods of weed management on weed dynamics and yield of summer rice (Oryza sativa) under system of rice intensification

Mohapatra S.1, Mohanty A.K.2, Tripathy S.K.1,*, Nayak B.R.3, Panigrahy N.4, Samant P.K.1, Lenka S.3

Regional Research and Technology Transfer Station, Orissa University of Agriculture and Technology, Chiplima, Sambalpur, Odisha, 768 025

1Senior Scientist (Agronomy), Regional Research and Technology Transfer Station, Chiplima, Sambalpur, Odisha, 768 025

2Associate Director of Research, Regional Research and Technology Transfer Station, Chiplima, Sambalpur, Odisha, 768 025

3Junior Scientist (Agronomy), Regional Research and Technology Transfer Station, Chiplima, Sambalpur, Odisha, 768 025

4Agril. Engineer, Regional Research and Technology Transfer Station, Chiplima, Sambalpur, Odisha, 768 025

*Corresponding author's Email: santanu_kt@yahoo.co.in

Online published on 11 October, 2017.

Abstract

A field experiment was conducted during the summer season of 2014 and 2015 to study the effect of irrigation and methods of weed management on weed dynamics, yield and nutrient uptake of rice (Oryza sativa L.) under system of rice intensification (SRI). Application of 50 mm water on the day before weeding operation was significantly superior to saturation (15 mm) on the day before weeding operation for grain yield (5.5 t/ha) owing to the lowest weed density (172.2/m2), weed dry weight (76.1 g/m2), and the highest number of panicles/plant (35.1) and filled grains/panicle (94). Pre-emergence application of pretilachlor @750 g/ha at 3 days after transplanting (DAT) followed by post-emergence application of chlorimuron ethyl + metsulfuron methyl @ 4 g/ha at 20 DAT proved to be most effective in minimizing the density of weeds (139.8/m2), their dry weight (65.5 g/m2) and enhancing weedcontrol efficiency (57.6%), grain yield (5.6 t/ha), N-P-K uptake of 66.1, 20.2, 23.0 kg/ha respectively by grain, net returns (52, 714/ha) and benefit: cost ratio (3.35).

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Keywords

Chlorimuron + metsulfuron, Pretilachlor, System of rice intensification, Water application method, Weed-control efficiency, Weed density, Weed dry weight, Yield.

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