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Project Abstract: Investigating the effects of seeding rates and lentil seed sizes on diseases, weeds, yields and profitability

The correct seeding rate for different classes is not known as many factors including seed size, plant foliar diseases, and the yield density response of the crop differ between lentil varieties and the environment they are grown in. Research was conducted at multiple locations in Saskatchewan over four years to develop seeding rate recommendations for different seed size classes of lentil that take into account plant diseases, lodging, competition, yield, and economic return.

The research is divided into three experiments.
- The first experiment evaluates disease control methods in combination with seeding rate in three different lentil seed size classes, to determine the impact on plant diseases and yield.
- The second experiment aims to refine the seeding rate recommendations for six classes of lentils under one fungicide regime that attempts to control plant diseases.
- The third experiment is looking at the combined effect of seeding rate and row spacing on seed yield and plant disease in three seed classes of lentil.

The experiments use dominant varieties within each seed class (extra small red, CDC Imperial, TSW 34; small red, CDC Maxim, TSW 40; large red, CDC KR-1, TSW 56; small green, CDC Imvincible, TSW 34; medium green, CDC Imigreen, TSW 57; and large green, CDC 3339-3, TSW 56), common fungicide regimes (None, Headline sprayed once, Headline and Bravo (two separate applications), and Fracture (new biofungicide applied at recommended application rate and timing)), and a wide range of seeding rates (60-320 seeds/m2).

Disease control experiments so far show that applying fungicide sequentially in two applications under environments can increase under an increased seeding rate. The highest seed yields were seen with seeding rates of approximately 200 seeds/m2 in small red lentil class. There is some evidence that small red lentil may require even higher rates than 200 seeds/m2 for optimum yield. Lentil yield was highest with 10-20 cm row spacings, and decreased as row width increased to 30 and 40 cm, regardless of what seeding rate was used.

This study gives mounting evidence that seeding rates for some classes of lentils should be increased when with aggressive fungicide regimes and that , and that narrow row spacings can be used, to optimize lentil yield.

Project lead: Dr. Steve Shirtliffe (306) 966-4959 steve.shirtliffe@usask.ca


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