Raquel Aparecida Furlan

Lâmina de irrigação e aplicação de CO2 na produção de pimentão cv. Mayata, em ambiente protegido

The effect of different irrigation water depth applications and the atmosphere enrichment with CO2 was evaluated. The experiment was carried out with sweet pepper (cultivar Mayata) in two similar plastic greenhouses in Piracicaba, Brazil. In one of them, CO2 was applied with irrigation water, increasing the CO2 concentration in the atmosphere to 800 mmolCO2/mol and in the other greenhouse the irrigation water was not enriched with CO2. In each greenhouse four irrigation water depths were applied, corresponding to 60; 80; 100 and 120% of a reduced pan evaporation (RPA), in a complete randomized block design with ten replications. The CO2 was injected into irrigation pipeline during a period of 40 minutes. Fruits were harvested from ten selected plants, after 90 days of transplanting, evaluating fruit number, length, diameter, pulp thickness, weight and yield (kg/ha). The effect of different irrigation water depths was observed for length, pulp thickness and fruit number per plant in the greenhouse with CO2 application. In the greenhouse with CO2 enrichment and irrigation water depths corresponding to 100% of RPA, differences were observed in length, pulp thickness, fruits numbers per plant and yield of 7.0%, 4.5%, 35.0% and 38.4%, respectively. On the other hand, in the greenhouse without CO2 application, different water depth applications did not affect any parameter. All analyzed parameters presented better results in the greenhouse with CO2 enrichment, except for the fruit pulp thickness. The CO2 application in the plastic greenhouse resulted in increased length, diameter, fruit number per plant, weight and yield of 12.4%, 11.9%, 21.4%, 20.0% and 51,3%, respectively.

Dióxido de carbono aplicado via água de irrigação na cultura da alface

ABSTRACT Carbon dioxide water for lettuce irrigation.The experiment was carried out in Piracicaba, Brazil, in order toevaluate the effects of carbon dioxide, applied with the irrigationwater, on the productivity and quality of the lettuce cultivated inplastic greenhouse. The treatments were designed in two plasticgreenhouses, one was enriched with CO 2 and the other without CO 2 ,where lettuce variety Ver onica was cultivated. The plastic greenhousehad eight plots with 1.2 x 6.0 m and spaced by 0.8 m. The crop wasirrigated with “Rain Tape ” drip with outflow of 1.15 L/h at operatingpressure of 60 kPa. The irrigation was scheduled on a daily basis inorder to apply 50 liters/m 2 /day of CO 2 daily. The seedlings wereproduced in plastic greenhouse by using isopor tray with vermiculiteas substratum. They were transplanted 30 days after sowing date inbeds of 1.2 m width and 6.0 m length, with 0.30 m spaced betweenplants and 0,30 m between lines. After the application of CO 2 (10/02/97 – 11/02/97) plants were harvested. Enrichment of irrigationwater with CO

Densidade de plantas e número de drenos influenciando a produtividade de roseiras cultivadas em vaso

The cultivation of flowers in Ceara State has expanded during the last years, especially in highland areas with a favorable climate for several crops. However, there exist only limited research in this area, so that producers work empirically with those crops. Consequently, this research aimed to evaluate the effects of the number of plants (2, 3 and 4) and the amount of drains (1 and 8) per pot on the number of stems per pot, in a protected environment. The experiment was carried out in Sao Benedito, Ceara State, Brazil, following a 3 x 2 factorial randomized block design with four repetitions. The number of stems with 35, 40, 50, 60 cm and, the total number of stems per pots of 12.0 L were evaluated. The highest number of plants per pot provided the greatest number of stems per pot, but with a predominance of lower commercial value. On the other hand, the least number of plants per pot resulted in few stems per area which were better evaluated commercially. The use of pots having more drains reduced the total number of stems per pot.