E. D. Eicholz

Adaptabilidade e estabilidade fenotípica de clones de cana-de-açúcar

O objetivo deste trabalho foi determinar a adaptabilidade e a estabilidade de clones de cana-de-acucar ( Saccharum spp.) de ciclo medio-tardio, quanto a producao de colmos e de acucar, e a eficiencia da conversao de energia solar em producao, na regiao Noroeste do Estado do Rio Grande do Sul. Treze clones foram avaliados em nove ambientes, em delineamento de blocos ao acaso, com tres repeticoes. As variaveis utilizadas para a analise de efeitos principais aditivos e interacoes multiplicativas (AMMI) foram: a produtividade de colmos e de acucar, e a eficiencia da conversao de energia solar em producao. Houve interacao entre clones e ambientes, e o clone RB996527 destacou-se por ampla adaptacao aos ambientes de teste, elevada produtividade de colmos e acucar, estabilidade e eficiencia da conversao de energia solar em producao, tendo superado a testemunha RB867515. Os ambientes com maior produtividade foram Sao Luiz Gonzaga (primeira-soca) e Santa Rosa (cana-planta e primeira-soca).

Qualidade de sementes de mamona em função da época de semeadura e ordem de racemo

Within the oil plant with the potential for biodiesel production, the castor bean has good development and productivity in Southern RS - Brazil, but there are few studies related to seed production technology. In this sense, the objective was evaluate the sowing date influence in seed quality of different raceme orders of the AL Guarany 2002 and IAC 80 cultivars. Experiments were carried out in two places (Passo do Quilombo and Florida), in 2006/07 season, in Cangucu country, using IAC 80 and AL Guarany 2002 cultivars, sowed in two different months (November and December). The experimental design was randomized block with three replications in 2x3 factorial (sowing date x raceme order) to AL Guarany 2002, and 2x2 factorial (sowing date x raceme order) to the IAC 80 in Florida and November sowing in Passo do Quilombo. In Passo do Quilombo was analyzed the effect of date sowing in first raceme order and raceme order effect in November sowing. Physiological and physic quality of seeds from different raceme-orders were evaluated. According with results, the seeds physical quality, thousand seed weight and volumetric seed weight , is affected by the raceme order and sowing date; the cv. AL Guarany 2002 seeds presents higla physiological quality in November sowing, independently of raceme order and cv. IAC 80 seeds have better physiological quality in the November sowing in first order racemes.