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Santa Rosa de Viterbo, Brazil

Marchezan A.,Instituto Federal Farroupilha IFFarroupilha | Souza A.M.,Federal University of Santa Maria
Ciencia Rural | Year: 2010

The aim of this research was to make predictions for 2007, referring to the price of temporary crops developed in the Rio Grande do Sul state. The data-base of the amout produced of the major grain analyzed were the annual average1995 to 2006 and price produced, from January 1995 to December 2006. To accomplish the forecasts in relation to prices of soybean, rice and sweetcorn in RS state, it was used the Box & Jenkins methodology. To such cultivations, the methodoly showed many significant models, however, through the penalizing criterias, AIC e SBC, in addition to the square average error, it was possible to choose the best model for each serie, being the model ARIMA (0,1,2)(0,1,0) to soybean; the model SARIMA (1,1,0)(1,0,1) to rice and the model ARIMA (2,1,1)(0,1,0) to sweetcorn.

Soares F.C.,Federal University of Pampa | Mello R.P.,Federal University of Santa Maria | Peiter M.X.,Federal University of Santa Maria | Belle R.A.,Federal University of Santa Maria | And 3 more authors.
Ciencia Rural | Year: 2012

This study aimed to evaluate the consumption of water in eight substrates (rice hulls - CAC, rice husk ash burned - CZ, coconut fiber - CF, land of paradise - TP, TP+CAC, TP+CZ, FC+CAC and FC+CZ) and define which of these substrates are the best for commercial production of Asiatic Lily 'Orange Pixie® ", grown in pots at protected conditions. The experiment was conducted in a greenhouse at the Department of Plant Science, UFSM, Santa Maria, RS. The experimental design was completely randomized using 12 replications and three plants per pot to determine the frequency of irrigation and water consumption. For evaluation of the parameters, it is stipulated limits of at least 60% and a maximum of 80% capacity of the container, checked daily using a digital scale. Measurements were performed on the substrates: the substrate density, total porosity, aeration and water space available. In plants, the following parameters were measured: plant height and insertion of the first flower, number of leaves and flowers, internode distance, average length of leaves and petals, average width of leaves and petals, total water consumption and irrigation frequency. The results showed that the Asiatic Lily 'Orange Pixie® "pot is suited for cultivation in the land of paradise substrate and coir mixture over rice husk ash. These substrates had an average water consumption of 121.65 and 106.78mL and irrigation frequency of 22 and 21 days respectively. The best combination was not the one consumed most water, but that one that required more frequent irrigation.

Gomes A.C.S.,Instituto Federal Farroupilha IFFarroupilha | Robaina A.D.,Federal University of Santa Maria | Peiter M.X.,Federal University of Santa Maria | Soares F.C.,Federal University of Pampa | Parizi A.R.C.,Instituto Federal Farroupilha IFFarroupilha
Ciencia Rural | Year: 2014

This study aimed estimate and validate a simulation model for the soybean crop in the region of Santiago, RS, Brazil which will, to the agricultural sector, support in decision making. For this, it was necessary to develop experimental procedure for generating the data needed to calibrate and test the simulation model, the extraction of water from the soil, and the response in crop production. As experimental results, obtained variations in the growth and development of soybean by applying different strategies for irrigation, resulting in different productivities. The increase in irrigation provided an increment in production components. Tests of simulated data showed a variation of less than 8% when comparing the data measured in field experiments with simulated data. The production model proposed was successfully able to simulate the accumulation of total dry matter and grain production for soybeans.

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