52

December, 2007
Passo Fundo, RS

Material and methods

This experiment was carried under conventional tillage, having natural grasses as previous use of the land, in an area that belongs to Greising y Elizarzú SRL and is located at Tarariras, Uruguay, Latitude 34o11’S, Longitude 57O31’13'' W, altitude of 100.8 m above sea level, in soil classified as Brunosol Subeutrico Haplico, with fertility parameters before seeding the experiment, recommended and applied fertilizer rates as detailed in Table 1. Mechanic seeding of the experiment was done on June 7, 2006 and emergence was observed on June 21. Plots had 4 rows of plants, with row spacing of 0.34 m and 5 m length, making an area of 6.8 m2.

At seeding 264 kg/ha of the formula 0 – 20/22 - 0 + 12 S (20% of soluble P and 22% of total P) plus 238 kg/ha of the formula 15-15-15 were applied by hand and incorporated before seeding. Top dressed nitrogen at rates of 164 kg of urea/ha, was applied at 24 days after emergence.

Presence of adults and larvae forms of Plutella spp were observed on September 8. On September 29, an application of the insecticide “Match” (Lufenuron 4.4%, 50 g/L) at a rate of 150 cc/ha and volume of 200 L/ha was made.

Grain yield was estimated based on the harvest of the two central rows of plants with 4 m length (2.72 m2). Harvest was done by hand and plants were threshed on a plot threshing machine. Calculations were made to correct grain yield to 10 % moisture content.

Phenological observations were made based on criteria adopted in Canada and Australia1, as follows. Emergence date: day at which 50% of the seedlings of the plot emerged. Beginning of flowering: day at which 50% of the plants present at least one flower. End of flowering: day when there are no more flowers, except on off type plants. Plant height: average plant height up to the upper extreme of the branches with pods. Maturation date: day at which 50% of the seeds have their colour turning to dark on the pods situated on the central part of the raceme of the plants. Plant lodging and plant height were rated respectively on October 16 and October 23.


1 Communication by e-mail by dr. Greg Buzza, canola breeder of Advanta Canada Inc., to Gilberto Omar Tomm, on 16 April 2003.

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