Screening of Ferro Stress Tolerant Rice Varieties based on Agronomy and Physiology Characters using Hydroponic Method

The availability of fertile land for agriculture is minimal, as a result, marginal land is problematic to
meet food needs. The problem with cultivating rice on this land is ferrous ion poisoning which causes nutrient
deficiencies, plant cell damage, air deficits and growth barriers. This research expands the survival rate, growth
and several agronomic and physiological characteristics under ferrous stress conditions. The aim is to produce
important information about the effect of iron on the agronomic and physiological characteristics of several rice
varieties cultivated hydroponically. The experiment was carried out in Air Pecah Lubuk Minturun, Padang City,
West Sumatra from March to July 2022. The two- factor factorial experiment used a completely randomized
design, with three replications. The first factor was rice variety, namely: Mekongga, Inpari 24, Inpari 27, and
Inpari 28. The second factor was ferrous ion content consisting of three levels, 0.0 mg kg-1 Fe (control), 75 mg
kg-1 Fe, and 150 mg kg-1. The Mekongga rice variety has the lowest agronomic and physiological adaptability compared to the Inpari 24, 27, and 28 varieties in hydroponic cultivation. The highest MDG production under
ferrous stress conditions in hydroponic cultivation was obtained to the Inpari 28 variety, namely 3,465 Mg ha-1
with iron contents in grain husks, and rice grains of 35 mg kg-1and 34 mg kg-1respectively.