Resistance of local rice progeny to ferrous iron toxicity between locations, seasons, and salt application in tidal lands

English. Received: August 13th, 2022 ; Accepted: November 27th, 2022 ; Published: December 7th, 2022 ; Correspondence: [email protected]

English. Rice is the main food in Indonesia that grows in various agroecosystems. The challengeis ferrous iron toxicity (FIT), wherein adaptive varieties with high yield potential be required tosupport increased production. The study objectives were to produce tolerant and widely adaptedlines of FIT from local parents, to determine the stability of the lines in various environments andseasons in FIT rice fields, and to determine the response of rice lines to salt application. Twolocal Fe-tolerant parents that is Cekau and Karya, were used as females to produce lines that weretested for FIT. High-yielding lines and early maturity were selected to represent tolerant, quitetolerant, and moderate to FIT. The research was designed according to a randomized completeblock design with 3 replications. Most of the local cultivar descent were resistant to FIT andstable at various locations and seasons. There was an interaction between the lines and theenvironment in the multilocation test, but in the high-Fe field test, there was no interactionbetween the lines and the season. Sensitive lines gave higher yields in the dry season than in therainy season, but the tolerant lines are not affected by the seasons. The long dry season followedby high rainfall caused the accumulation of Fe on the soil surface to increase followed by adecrease in yields of moderate and sensitive lines. The addition of 200 kg ha-1 of salt increasedthe productivity of tolerant, quite tolerant, and moderate lines by improving root quality.