Response of High-yielding Rice Varieties in Specific Coastal Areas of Purworejo and Kebumen in the Generative Phase

Rice (Oryza sativa L.) is a critical food crop and a staple source of nutrition in Indonesia. However, rice productivity has experienced a decline over time due to factors such as land conversion and varying land conditions. One significant challenge in rice cultivation arises in saline environments, where high salt content adversely affects crop productivity. Although various rice varieties have been cultivated in coastal regions, certain areas exhibit elevated salinity levels that disrupt rice plant growth. This study aims to identify rice varieties that exhibit resilience to saline stress. The research employed a two-factorial Randomised Complete Block Design (RCBD), incorporating both variety and environment as factors. The interaction between genotypes and environmental conditions significantly influenced the age at which 50% flowering occurred. The Inpari 34 Salin Agritan variety demonstrated the earliest age of 50% flowering at 96 hours after sowing (HSS) across both study locations, although it was not significantly different from the Inpari 35 Salin Agritan variety, which had a flowering age of 97 HSS, and the IPB 12S variety, which exhibited a flowering age of 98 HSS. Conversely, the Cilamaya Muncul variety exhibited the longest age to 50% flowering at 115 HSS, although this was not significantly different from the TP-Padi 2 variety, which reached 50% flowering at 111 HSS.