Vol. 12, Issue 9 (2023)

An investigation entitled “Effects of plant growth regulators on dry matter production and morpho-physiological parameters of bunch groundnut cv. TG-37A” was carried out at farm of Main Oilseeds Research Station, Junagadh Agricultural University, Junagadh, during kharif 2020. The experiment was arranged in randomized block design and replicated thrice consisting of eleven treatments of NAA @ 200 & 500 ppm at 70 & 90 DAS, SA @ 500 & 1000 ppm at 70 & 90 DAS, MC @ 150 & 250 ppm at 70 & 90 DAS, CCC @ 5000 ppm at 70 & 90 DAS, CCC @ 10,000 ppm at 90 DAS, PBZ @ 250 & 350 ppm at 70 & 90 DAS and control (water spray) at 70 & 90 DAS. The experiment's findings showed that foliar applications of NAA, SA, MC, CCC, and PBZ at various concentrations increased the production of dry leaf, stem, and root weights as well as total dry matter, with NAA @ 500 ppm treated plants producing more of these dry leaf, stem, and root weights. The leaf area index (LAI) recorded significantly higher in NAA @ 500 ppm at 80 DAS and decreased thereafter due to senescence and ageing of leaves. Significantly the highest mean of LAI observed in NAA @ 500 ppm treatment. Crop growth rate (CGR), which is governed by LAI, photosynthetic rate, and leaf angle and is a measure of quantity of light interception, is utilized as a parameter for measuring production efficiency of crop stands. Finally, it can be concluded that the best concentration of NAA to increase the greatest mean of LA, LAI, LAD, CGR, AGR, and RGR of groundnut is to spray plants with NAA @ 500 ppm at 70 and 90 DAS.