Effect of plant growth regulators on growth and yield of coriander (Coriandrum Sativum L.)

An experiment was conducted at Medicinal Unit of Department of Horticulture, Faculty of Agriculture, Annamalai University during the rabi season of 2020 - 21 in randomized block design with three replications, comprised of eleven treatments of five plant growth regulators each of two level viz., GA3 (100 and 200 ppm), NAA (100 and 200 ppm) and cycocel (250 and 500 ppm), triacontanol (50 and 100 ppm), vermiwash (1 and 2 L ha-1) foliar spray at 25 & 50 DAS and control (water spray). The results of the experiment revealed that foliar application of GA3 100 ppm at 25 and 50 DAS recorded significantly higher values of growth parameters viz., plant height, primary and secondary branches per plant and yield attributes viz., number of umbels per plant, number of umbellates per umbel, number of seeds per umbel, number of seeds per plant  over control (water spray), which was comparable and significantly not different from foliar application of GA3 200 ppm and NAA 100 ppm in respect of seed and stover yields. The economics of plant growth regulator treatments also indicates that foliar application of GA3 100 ppm at 25 and 50 DAS was more profitable in terms of net returns (Rs. 64337 ha-1) and B: C ratio (2.83) in comparison to rest of the treatments.