The agronomic pattern of wetland rice with different timings of gibberellic acid (GA3) application treatment

Abstract

Gibberellic acid (GA3) is an exogenous plant growth hormone that influences plant physiological processes, ultimately affecting plant growth, development, and yield. This study aimed to investigate the agronomic performance of several rice varieties (Oryza sativa L.) cultivated with different timings of GA3 application. The research was conducted in Lengau Seprang Village, Tanjung Morawa Subdistrict, Deli Serdang Regency, at an elevation of 80 meters above sea level from April to September 2021. The study utilized a randomized complete block design with two treatment factors. The first factor was rice varieties, including Inpari 32, Ciherang, and Siporang. The second factor was the timing of gibberellic acid application, which included 0, 1, 2, and 3 applications (at 20, 45, and 60 days after transplanting). The research results indicated that the different timings of GA3 application did not significantly affect all observed parameters. Siporang exhibited the highest average values for plant height, panicle length, and flag leaf area. However, it produced the lowest grain weight per hill compared to the other two varieties. The highest grain weight was obtained from the Inpari 32 variety.