M. Dhayanethi, S. Ramesh, P. Sudhakar, C. Kalaiyarasn and G. Baradhan
Abstract
A field experiment was conducted during May - September 2022 at the Experimental Farm, Department of Agronomy, Faculty of Agriculture, Annamalai University, Annamalai Nagar, Tamil Nadu to study the influence of gibberellic acid and nutrients on growth analysis, productivity and economics of transplanted rice under wetland ecosystem. The experiment was laid out in randomized block design and replicated thrice with ten treatments it including foliar spray of plant growth regulators (Gibberellic acid, Triacontanol, Sodium para-nitrophenolate) alone and in combination with macro nutrients like DAP, KCI and NPK (19:19:19). Results show that, gibberellic acid 40 % WSG @ 20 g ha-1 (20 DAT) + 2 % DAP+ 1 % KCL (40 and 50 DAT) significantly recorded the highest dry matter production and growth analysis viz., CGR and AGR. The yields also were higher with application of gibberellic acid 40 % WSG @ 20 g ha-1 (20 DAT) + 2 % DAP + 1 % KCL (40 and 50 DAT). The lowest dry matter production, growth analysis and yields were recorded in control (water spray).