Abstract
Dryland area in Indonesia reaches 108.8 millions ha (69.4%) of the total dry land with the potential to expand the area of food crops reaching 7.1 million ha, which is dominated by ultisol and oxisol soil types. Plant constraint cultivation on ultisol soil types is the acidic soil pH with high Al and Fe levels. One of the efforts that can be made to cultivate plants on ultisol soil is the selection of plants that are tolerant of Fe stress. This study aimed to determine a tolerance level and F6 red rice lines that were tolerant of iron (Fe) stress in ultisol soils. The experimental design used was factorial Completely Randomized Design (CRD) consisting of 2 factors, the first factor consisted of 12 treatments (10 test lines and 2 comparison varieties) and the second factor was iron stress with concentrations (0 ppm and 551,55 ppm). The stress was applied after 3 WAP. The stress resistance test to iron (Fe) should that all lines of red rice F6 on ultisol soils have a score of 1 which indicates the stress tolerance of Fe at a concentration of 551,55 ppm Fe. The 23A-56-30-25-12 and 23A-56-30-25-13 lines were the best lines that were tolerant of 551,55 ppm iron (Fe) stress with the highest growth and yield. The lines tested can be developed on ultisol soils because they are tolerant of Fe.
Highlights
IntroductionThe production red rice reach 10% of the rice acreage in china, India, and Vietnam
Rice is the most important and strategic commodity
Fe stress on the lines and varieties of upland rice plants did not have a different effect on the growth of rice plants
Summary
The production red rice reach 10% of the rice acreage in china, India, and Vietnam. According to Lakitan (2014) Efforts to increase agricultural productivity in suboptimal lands should not jeopardize sustainable function of the ecosystem and participation of local farmers. Efforts can be made to overcome this problem by increasing the productivity of existing rice fields and the development of upland rice cultivation in sub-optimal land. Upland rice can be developed in areas with dry and sedate land conditions (Sadimantara & Muhidin, 2012). More of the areas that is currently trying to increase rice production. High Fe content will inhibit the growth of rice plant resulting in a decrease in production can even lead to crop failure (Nugraha & Rumanti, 2017)
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