Resistance of local rice progeny to ferrous iron toxicity between locations, seasons, and salt application in tidal lands
¹National Research and Innovation Agency, Agricultural and Food Research Organization, Cibinong Science Center, Jl. Raya Jakarta-Bogor, Cibinong, Bogor Regency 16915, Indonesia
²The Assessment Institute for Agricultural Technology of Riau, Jl. Kaharudin Nasution No. 341 Pekanbaru, Indonesia
³National Research and Innovation Agency, Research Center for Horticulture and Estate Crops. Cibinong Science Center, Jl. Raya Jakarta-Bogor, Cibinong, Bogor Regency 16915, Indonesia
Rice is the main food in Indonesia that grows in various agroecosystems. The challenge is ferrous iron toxicity (FIT), wherein adaptive varieties with high yield potential be required to support increased production. The study objectives were to produce tolerant and widely adapted lines of FIT from local parents, to determine the stability of the lines in various environments and seasons in FIT rice fields, and to determine the response of rice lines to salt application. Two local Fe-tolerant parents that is Cekau and Karya, were used as females to produce lines that were tested for FIT. High-yielding lines and early maturity were selected to represent tolerant, quite tolerant, and moderate to FIT. The research was designed according to a randomized complete block design with 3 replications. Most of the local cultivar descent were resistant to FIT and stable at various locations and seasons. There was an interaction between the lines and the environment in the multilocation test, but in the high-Fe field test, there was no interaction between the lines and the season. Sensitive lines gave higher yields in the dry season than in the rainy season, but the tolerant lines are not affected by the seasons. The long dry season followed by high rainfall caused the accumulation of Fe on the soil surface to increase followed by a decrease in yields of moderate and sensitive lines. The addition of 200 kg ha-1 of salt increased the productivity of tolerant, quite tolerant, and moderate lines by improving root quality.