Roots Bioassay of Upland Rice Varieties on Several Soil Moisture Gradients

Abstract

Water availability is a major factor affecting rice production especially in upland. The Production of upland rice is low because of the low of water availability in upland. Roots play an important role in upland rice adaptation to drought conditions. This study aimed to identify the characteristic of upland rice variety root development under soil moisture gradients. This study use randomized factorial design consisting of 2 factors and 3 replicate. Factor I : 12 upland rice variety, ie: Silumut, Batutegi, Limboto, Situpatenggang, Situbagendit, Towuti, Cirata, Danau Gaung, Gajah Mungkur, Inpago 4, Inpago 5, Inpago 6. Factor II : gradien of soil moisture level, ie: 20 %, 40 %, 60 %, 80 % field capacity. The Result of research indicate all the upland rice variety were classified tolerance based on relative value of root leght. The highest root lenght and the heaviest root dry matter were generally from combination uplandrice varieties with 60 80 % field capacity except Inpago 4 and Situbagendit showed the highest root lenght at 20 % field capacity and combination The heaviest root dry matter at 40 %were Inpago 4 and Jatiluhur generally from characteristic of root gro field capacit