Formerly International Journal of Basic and Applied Agricultural Research

Weed management and crop geometry effect on nutrient uptake and yield in aerobic rice

VASUNDHRA KAUSHIK, S. P. SINGH, V. P. SINGH, TEJ PRATAP and B. S. MAHAPATRA
Pantnagar Journal of Research, Volume - 18, Issue - 3 ( September-December, 2020)

Published: 2020-12-31

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Abstract


A field experiment was conducted at Norman E. Borlaug Crop Research Centre of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, laid out in split plot design (SPD) with four replications during Kharif season of 2017 to assess the effect of weed management practices and row spacing on growth and yield attributes of aerobic rice as well as density, dry matter accumulation and nutrient uptake by weeds. Among row spacing, the lowest total weed density, total dry matter accumulation and nutrient uptake was recorded under 25 cm row spacing. The highest weed control efficiency (73.9%) at 60 DAS, grain yield (4.2 t/ha) and B: C ratio (2.0) was achieved at row spacing of 25 cm with application of Pendimethalin 1.0 kg/ha (PEm) fb Penoxsulam 22.5 g/ha (PoEm). While, 20 cm and 30 cm row spacing were significantly at par to row spacing of 25 cm, in terms of weed control efficiency, yield and B:C ratio. Row spacing of 25 cm recorded the highest number of shoots per square metre at 60 DAS and at maturity. However, among weed management practices, Pendimethalin 1.0 kg/ha (PEm) fb Penoxsulam 22.5 g/ha (PoEm) recorded lowest removal of nutrients (N, P and K) by weeds, highest plant height, number of shoots per square meter and grain yield (4.4 t/ha) than other weed management treatments after weed free.


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