Assessing Impact of Naphthalene Acetic Acid on the Growth and Yield of Okra (Abelmoschus esculentus (L.) Moench)

Abstract

This study assessed the impact of naphthalene acetic Acid (NAA) on the growth and yield of Okra cv. Sabz Pari at Agricultural Research Institute, Dera Ismail Khan, Khyber Pakhtunkhwa, Pakistan. A field experiment was set out in randomised complete block design with NAA application as a main factor. Different NAA concentrations were obtained by dissolving NAA in distilled water at the rate of 0 (control), 10, 30, 50, 70, 90 and 110 mg/L. NAA treatments along with control were foliar applied to okra plants after 30 days of sowing. Lower concentration of NAA (30-50 mg/L) stimulated maximum increase in plant height (59.5-57.2%), number of leaves/plant (50.4-45.5%,), total plant leaf area (113.9-119.4%), internodes/plant (72.5-61.6%), internode length (53.2-44.5%), pod diameter (53.5-49.9%), pod fresh weight (126.8-111.8%), pod yield (271.2-255.8%) compared to control (0 mg NAA/L). NAA at higher concentrations (>50 mg/L) had a supressing effect on most parameters. It was inferred that yield production in okra is influenced by multiple yield-determining component traits and their mutual interactions which could be manipulated by the application of NAA. Foliar application of NAA (30-50 mg/L) have a beneficial impact on plant characters and yield of Okra, hence recommended in Okra cultivation.
 

Effect of Plant Growth Regulators on Vegetative Growth and Flowering of Okra [Abelmoschus esculentus (L.) Moench.]

“…NAA is a well-known auxin that increases cell division and cell enlargement which might have increased the number of nodes and number of branches on the main stem and improved mobilization of photosynthates in the plant leading to the production of thicker stems. Similar results have been reported by Nisar et al, [11]. Early appearance flowers on the plant might be ascribed to increased accumulation of photosynthates and their enhanced mobilization towards the sink with the application of NAA.…”

Effect of foliar application of plant growth regulators on yield and yield attributes of okra in western arid region of Rajasthan

“…As application of NAA revealed most prominent effect, compared to other growth regulator, hence resulted in maximum fruit yield per plant and estimated fruit yield per hectare. The results are in agreement with the earlier findings of Mandal et al (2012) [14] , Singh et al (2017) [18] and Nisar et al (2021) [16] .…”