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Effect of naphthalene acetic acid (NAA) on grain yield and bioeconomic efficiency of coarse rice (Oryza sativa L.)

Iqtidar Hussain, Abdul Aziz Khakwani, Imam Bakhsh, Ejaz Ahmad Khan and Sheheryar

Plant growth regulators (PGRs) play a pivotal role in plant’s life as they coordinate and regulate many physiological processes governing crop growth and yield. Bioeconomic efficiency of a plant growth regulator (NAA 4.5% as sodium salt) on coarse rice (IR-6) was assessed under the agro-ecological conditions of Dera Ismail Khan, Pakistan over two years. The research was conducted in a randomized complete block design (RCBD) with split plot arrangement, repeated four times. Main plots were considered for assessment of three decisive developmental stages of the paddy rice, S1 (tillering), S2 (panicle initiation), and S3 (grain formation stage), while four levels (0, 60, 90 and 120 ml ha-1) of NAA were applied in four sub-plots. The PGR application at different growth stages increased biomass, straw yield and paddy yield (t ha-1) of the paddy rice. Application of NAA @ 90 ml ha-1 at the panicle initiation stage caused the highest increase in biomass yield (18.90 and 19.10 t ha-1), paddy yield (8.00 and 8.20 t ha-1), straw yield (12.00 and 12.30 t ha-1), harvest index (42.32 and 42.93%), crop growth rate (28.6 & 32.4 g m-2 day-1), photosynthetic efficiency (1.91 and 1.57%), and leaf area index (12.9 and 13.2). Bioeconomic efficiency was also increased (2.09 and 2.16) during both years, respectively. It was concluded from the results so obtained that exogenous application of NAA @ 90 ml ha-1 at panicle initiating and tillering stage had been helpful in attaining higher yields in rice with more net returns.

To Cite this article: Hussain, I., A.A. Khakwani, I. Bakhsh, E.A. Khan and Sheheryar. 2021. Effect of naphthalene acetic acid (NAA) on grain yield and bioeconomic efficiency of coarse rice (Oryza sativa L.). Pak. J. Bot., 53(6): DOI:

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