Produtividade de colmos em clones de cana-de-açúcar 1 O objetivo deste trabalho foi avaliar a produtividade e as características de colmos de 25 clones de cana-de-açúcar, nos cultivos de cana-planta e cana-soca. O experimento foi realizado nos anos agrícolas de 2009-2010 (cana-planta) e 2010-2011 (cana-soca), em Jaguari, RS. O delineamento utilizado foi o de blocos ao acaso, em esquema fatorial (clones e cultivos de cana-planta e cana-soca), com três repetições. Ao final de cada cultivo, foram realizadas avaliações de comprimento, diâmetro, número e produtividade de colmos. Os dados obtidos foram submetidos à análise da variância e, as médias, comparadas pelo teste de Tukey, a 5% de probabilidade A produtividade média de colmos dos clones mais produtivos de ciclo precoce, nos cultivos de cana-planta e cana-soca (96,6 e 123,4 t ha -1 , respectivamente) foi semelhante à obtida com os clones mais produtivos de ciclo médio-tardio (101,5 e 128,0 t ha -1 , respectivamente). No cultivo de cana-soca, a produtividade média de colmos superou a obtida no cultivo de cana-planta, com 13 dos 25 clones avaliados. Em geral, os clones mais produtivos apresentam valores elevados de número e de comprimento de colmos, sendo observada baixa variação do diâmetro de colmos dos materiais testados. Os clones RB965911, RB925345, RB855156, RB987935, RB935744, RB867515, RB975019, RB925268, RB845210 e RB975329 são os mais adaptados às condições edafoclimáticas da região da Depressão Central do Rio Grande do Sul, apresentando maior produtividade de colmos, com valores acumulados, nos dois cultivos, superiores a 200 t ha Productivity and agronomic variables in sugarcane clonesThe objective of this study was to evaluate the productivity and characteristic of stalks from 25 sugarcane clones in plant-cane and ratoon cultivations. The experiment was conducted in Jaguari, RS, Brazil, during the 2009/2010 (plant cane) and 2010/2011 (ratoon) growing seasons. The experimental design was randomized blocks in a 25 × 2 factorial arrangement (25 clones and two growing seasons), with three replications. At the end of each growing season, the length, diameter, and number and productivity of stalks were evaluated. The data were subjected to analysis of variance and means were compared by Tukey test at 5% probability. The average stalk yield of in the most productive clones with early cycle in plant-cane and ratoon (96.6 and 123.4 t ha -1 , respectively) was similar to that obtained with the most productive clones with mid-late cycle (101.5 and 128 t ha -1 , respectively). The stalk yield in ratoon exceeded that obtained in the plant-cane in 13 of the 25 clones evaluated. In general, the most productive clones have elevated number and length of stalks, with an observed low variation in stalk diameter of the tested materials. The clones RB965911, RB925345, RB855156, RB987935, RB935744, RB867515, RB975019, RB925268, RB845210, and RB975329 are the most adapted to the soil and climatic conditions of the Depressão Central do Rio Grande do Sul region, with hi...

Strawberry culture is economically important because its fruits are widely consumed in natura, in unprocessed and processed forms, by a variety of industries. Currently the semi-hydroponic cultivation of this crop has been gaining space in relation to soil cultivation, which makes it important to identify, through studies, different systems, cultivation sites, as well as the use of different substrates. The objective of this study was to analyze the agronomic response of Camarosa strawberry cultivar in an out-of-soil system with the use of alternative substrates at different densities. The experiment was carried out in Pelotas-RS, in the locality of Monte Bonito (31°39'44''S, 52°27'29''W at 52.46 m altitude). The experimental design was completely randomized in a subdivided plots scheme, with three replications. In the main plots were allocated three substrates composed of carbonized rice hull, organic compost and tungue pie, and in the subplots, the planting densities of 9, 10, 12, 16 and 20 m-2 plants were allocated. The vegetative growth and the fruit production of the Camarosa cultivar were evaluated. It can be concluded that the addition of organic compound and tungue pie to the carbonized rice hull favors the development of the plants, the production and size of strawberry fruits in the semihydroponic system adopted. The density of 20 plants m-2 confers higher productivity for the cultivar Camarosa.