La coltivazione del riso in regime biologico: i risultati della sperimentazione 2012

Within the frame of an experimental project on organic farming, cultivation trials were performed to characterize rice varietal response on farms with expertise in rice organic farming cultivation. Selected varieties included recently developed and traditional ones belonging to all different merceological classes. For the round rice group, the varieties were Brio, Cerere, Ducato and Selenio. For the long A group, varieties were chosen according to their end use: Loto and Opale, utilized for the production of parboiled rice while Ulisse, Meco and Volano for the national market. For the long B group Arsenal, Ellebi and Salvo were tested. The experimentation revealed an average yield of about 6 t/ ha, therefore lower than those recorded under conventional farming conditions. The highest yield was observed in Mede Lomellina (Pv) with Brio, Opale and Meco, being the best performing varieties with about 7 t/ha, while in Valle Lomellina (PV) average yield was lower (5,9 t/ha) and the varieties with highest yield were Loto, Opale, Ulisse (about 6,5 t/ha) and finally Selenio with about 8 t/ha. Considering also the availability of data derived from the experimentation of the previous years, data highlighted that within the round group the varieties Brio and Selenio were the most adaptable ones to organic farming conditions. Within the long A group, Opale for parboiled rice, and Volano for national market demonstrated to provide good yield levels for the 3 years although the cultivar Volano had serious lodging, while within the long B group, Ellebi was the best performing considering the three years of trials and Arsenal showed good yield and high amylose content.