Vol. 11, Issue 12 (2022)

Author(s):
S Kumaravel, P Nandakumar, M Mathialagan and K Maheshwaran

Abstract:
In worldwide increasing population of future generation likewise their food needs also increased. So meet out their needs by rice production have a vital role. The productive potential of rice is mainly governed by many factors but deficiency of plant growth regulators (PGR) of plant develop a barrier to obtain higher yield. In this situation one of the newer technology to increase the productivity of rice through application of PGR on rice crop is helpful. The treatments are T₁ - Gibberellic acid 40% WSG @ 10 gm ha^-1, T₂ - Gibberellic acid 40% WSG @ 20 gm ha^-1, T₃ - Abscisic acid 20% SG @ 60 gm ha^-1, T₄ - Abscisic acid 20% SG @ 30 gm ha^-1,T₅ - Humic acid 12% @ 12.5 l ha^-1, T₆ - Humic acid 12% @ 10 l ha^-1, T₇ - Triacontanol 0.05% EC @ 250 ml ha^-1, T₈ - Triacontanol 0.05% EC @ 150 ml ha^-1, T₉ - Untreated control. Growth regulators viz., Gibberellic acid (GA3), Humic acid, and Triacontanol were foliar sprayed at active tillering stage and Abscisic acid was foliar sprayed at early grain filling stage of crop growth. The result showed that foliar application of Humic acid 12% @ 12.5 l ha^-1 (T₅) recorded the highest growth attributes viz., plant height, number of tillers m^-2, root length, leaf area index, dry matter production and crop growth rate (CGR) compare to the control.