Pengaruh Iradiasi Sinar Gamma terhadap Karakter Morfo-Agronomi Padi Sawah (Oryza Sativa L.) Kultivar Sipulo Bontar

Abstract

SANDI PASKAH MARPAUNG. The Effect of Gamma Ray Irradiation on the Morpho-agronomic Characteristics of Rice (Oryza sativa L.) Cultivar Sipulo Bontar (Under the supervision of MUHAMMAD SYAHRIL as the Supervisory Committee). This study aims to determine the LD50 value and the effect of gamma irradiation on the morpho-agronomic characteristics of Sipulo Bontar rice cultivar in the M1 generation. The study was conducted at Jalan Pasar 1 No. 296, Tj. Sari, Kec. Medan Selayang, Medan City from March to October 2025. The LD50 value was determined using Curve-Fit analysis, while the field experiment used a non-factorial Randomized Block Design (RBD) with four levels of gamma radiation treatment, namely G0 (Control), G1 (100 Gy), G2 (200 Gy), and G3 (300 Gy). The results showed that the LD50 value of the Sipulo Bontar rice cultivar based on the germination percentage parameter was 206.24 Gy. The results of the analysis of variance showed that gamma irradiation treatment had no significant effect on the number of tillers, number of productive tillers, and weight of 1000 grains. However, radiation had a significant to very significant effect on the characteristics of flowering age, harvest age, panicle length, total grain number per panicle, filled grain number per panicle, empty grain number per panicle, and grain weight per cluster. Treatment G1 (100 Gy) was the best treatment because it was able to induce early maturity while maintaining fertility (number of filled grains) equivalent to the control plants, despite a decrease in yield due to high sterility rates.