Intermittent Irrigation Response Study Method of Rice Intensification System on Several Rice Varieties in The Physiology of Growth and Results of Rice

A research aims to determine irrigation system and rice varieties that have the highest physiological growth and yield and to examine an interaction between plant varieties and irrigation systems on growth physiology and yield of rice plants. It was conducted at the Faculty of Agriculture, Universias Muhammadiyah Yogyakarta from May to August 2018. This study was arranged in a factorial 4x2 Randomized Complete Block Design with three replications. The first factor consisted of four rice varieties, i.e. Ciherang, Memberamo, Inpari-19, and Rojolele. The second factor consisting of two irrigation system, namely SRI and conventional methods. The results showed that the significantly highest crop harvest index was found in Ciherang variety in comparison to Inpari-19 and Rojolele. The highest weight of grain was significantly found in Rojolele variety in comparison to Inpari-19, Ciherang, and Memberamo and the lowest percentage of the unfilled grains was found in Ciherang variety in comparison to others. SRI irrigation method could result in the higher fresh weight growth and total root length compared to the conventional irrigation methods. The growth of the number of productive tillers, and the dry weight of plants within 12 weeks had a significant interaction between rice varieties and irrigation methods.