Screening of rice genotypes and evaluation of their ratooning ability in tidal swamp area

Abstract

Indonesia has a large diversity of local tidal swamp rice with ratooning character that can be exploited. The study was aimed to screen 68 of rice genotypes that have ratoon traits from 68 genotypes, to determine the selection criteria for ratoon rice and to determine the performance of selected genotypes in tidal land. The experiment was designed in a Randomized Complete Block Design (RCBD) with three replicates. Each genotype was planted in four rows of 5 m long with spacing of 20x20 cm with 20 days old seedling. Each hill was planted with one seedling. Plants were harvested 32 days after heading by cutting at a height of 10 cm from the soil surface. One day after harvest, the land was irrigated as high as 3 cm and sown Urea 50 kg ha-1, TSP 30 kg ha-1 and KC1 25 kg ha-1. Of the 68 genotypes tested, the highest nine at ratoon genotypes were tested in tidal acid sulphate soil in a RCBD with three replicates. The results showed that there was a variation of ratooning ability among genotypes tested with regard to yield of ratoon. Culm diameter of main crop had highest significant direct effect to yield of ratoon. Genotypes of IPB97-F-13-1-1, IPB107-F-14-4-1, IPB107-F-14-5-1, IPB Batola 6R, Inpago IPB 8G, IPB 4S, IPB BATOLA 5R, IPB 3S and IPB107-F-18 were able to produce at least 7.5 g/hill of Dry Milled Grain (DMG). The ratoon of these genotypes produced the yield of at least 40% from the main crop, showed good performance and possessed similar harvesting period. Further, the ratoons of IPB97-F-13-1-1, IPB107-F-14-4-1, IPB 4S and IPB 3S produced 1.55, 1.60, 1.53 and 1.53 t ha-1 of DMG in the acid sulfate soil, respectively. It can be concluded that genotype with ratooning ability were valuable to increase rice production in tidal land.