Sostenibilidad y eficiencia en el suministro de servicios energéticos a poblaciones dispersas y de bajos recursos

Fil: Biloni, J. Ente Nacional Regulador del Gas (ENARGAS); ArgentinaFil: Cobas Andrinolo, M. B. Ente Nacional Regulador del Gas (ENARGAS); ArgentinaFil: Carrizo, S. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Estudios sobre América latina (CESAL-CONICET); ArgentinaFil: Codeseira, L. Universidad Nacional de San Martín (UNSaM); ArgentinaFil: Fiora, J. Instituto Nacional de Tecnología Industrial. INTI-Energía; ArgentinaFil: Gastiarena, M. Ente Nacional Regulador del Gas (ENARGAS); ArgentinaFil: Iannelli, L. Ente Nacional Regulador del Gas (ENARGAS); ArgentinaFil: Jacinto, G. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Estudios sobre América latina (CESAL-CONICET); ArgentinaFil: Prieto, R. Ente Nacional Regulador del Gas (ENARGAS); ArgentinaFil: Gil, S. Universidad Nacional de San Martín (UNSaM); Argentin

Nitrogen application in dry-seeded delayed-flooded rice in Italy. Effect on yield and crop parameters

Dry-seeded delayed-flooded rice in Italy is important in some areas with high sand content. The effects of N application timing and rates on grain yield, milling yield, plant height, total biomass, harvest index (HI) and crop N content were evaluated for dry-seeded delayed-flooded rice in Italy to increase the N use efficiency and to study N fertilizer recommendations. Two widely grown non-semi-dwarf varieties were studied: Drago and Loto. Three 21 N rates were used: 60, 120 and 180 kg N ha . For each rate the fertilizer was applied in seven splits across three growth stages: pre-sowing, pre-flooding and panicle differentiation. Drago produced higher yields and N application at all stages increased yield. Late N application caused the development of secondary sterile tillers, decreasing harvest index. Loto responded to earlier N applications but not to late N applications. In contrast with other trials outside Italy, pre-plant N fertilization was effective in increasing yield. Brown rice and total milled rice yields were higher for Loto. Increasing the applied N rate increased the head rice yield range. With low N no low values were recorded and variation between splits was small. With high N the highest head yield was observed with split application. Height was significantly affected by N rate and split, with a range of 65 to 92 cm and 54 to 86 cm for Drago and Loto, respectively. N application at tillering was more effective. N rate and split affected biomass and decreased HI. Crop N content at maturity was affected by late N application and by total applied fertilizer. N content in the panicle showed lower variation with N split and rate and was negatively correlated with 21 yield. At 120 and 180 kg N ha all nitrogen applied pre-flooding gave good results in both sites, but the best results were obtained with N split at pre-sowing and pre-flooding, with low yield increase moving from 120 to 180 21 kg N ha .We recommend late N applications for Drago (medium-late variety), but not for Loto (early variety)

Italian rice varieties : hystorical data, molecular markers and pedigrees to reveal their genetic relationships

Two molecular marker approaches [amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR)] were employed to study genomic relationship among 96 rice cultivars. These included most of the best reputed Italian accessions. AFLP produced 461 fragments, 248 (53%) of which were polymorphic, SSR produced four to 11 alleles in the 12 genomic loci investigated. Genomic similarity was estimated independently for the two molecular marker techniques. Both AFLP and SSR dendrograms agree in splitting the cultivars into two main clusters: a small one, comprising four exotic accessions, and a larger one which could be split into four sub-groups. These were also analysed on the basis of historical and pedigree information. This is the first report on the application of DNA polymorphism analysis to reveal genomic relationship among cultivated Italian rice germplasm. Results will be useful for breeding programmes

Monitoring fungi on rice seed of several italian varieties

Many fungi can be present on rice seed and some can cause problems both to plant growth and to production quality. A survey was conducted in Italy to list the fungi present on seed with and without hulls. The fungi greatly differ in distribution among varieties and in abundance on seeds. Some of them seem to be linked to the spot on white rice and could be the cause of quality decreasing in Italy. A total of 51 italian rice varieties were investigated. The number of observed fungus taxa was 62 and 51 for paddy and husked rice seed, respectively