Shannon Chant M.Sc. PAg.
Regional Crops Specialist, Southwest Regional Services Branch
In 2011 and 2012, Wheatland Conservation Area Inc. (WCA) had an ADOPT project demonstrating the role of various inputs on large green lentil production. WCA conducts research and demonstration projects throughout southwestern Saskatchewan, with their main site located just outside of Swift Current.
Starting will a full set of inputs, WCA removed each input separately and looked at what impact each input had when removed from a full set of inputs. The treatments were:
- Full inputs: new variety (CDC Improve CL); phosphorus fertilizer (20 lbs/ac actual P); label rate inoculant (granular); label rate of herbicide (Odyssey and Equinox); label rate of fungicide (Headline Duo); recommended seeding rate (80 lbs/acre).
- Full inputs except the variety was older (herbicide was changed to Poast Ultra).
- Full inputs except phosphorus fertilizer.
- Full inputs except inoculant.
- Full inputs except herbicide.
- Full inputs except fungicide.
- Full inputs but the seeding rate was reduced to 80 per cent of the recommended rate (rate reduced to 64 lbs/acre).
- Reduced inputs: older variety (CDC Plato), no fertilizer and no fungicide (herbicide was changed to Poast Ultra).
In both years, the highest yield came from the full inputs treatment showing that the best way to produce large green lentils is to use newer varieties, the recommended seeding rate, recommended phosphorus fertilizer application and the recommended rates of inoculant, herbicide and fungicide.
In 20ll, the yield reduction due to removing inputs (full input treatment yield (1,500 lbs/acre) minus input removed treatments) was:
- Full inputs except inoculant and reduced inputs (over 600 lbs/acre lower yielding than full inputs).
- Full inputs except herbicide (about 540 lbs/acre lower yielding).
- Full inputs except fertilizer (about 360 lbs/acre lower yielding).
- Full inputs except the variety was older and Full inputs with 80 per cent seeding rate. (about 240 lbs/acre lower yielding).
- Full inputs except fungicide (about 60 lbs/acre lower yielding).
In 20l2, the yield reduction due to removing inputs (full input treatment yield (1,680 lbs/ac) minus input removed treatments) was:
- Full inputs except the variety was older and reduced inputs (about 840 lbs/acre lower yielding than full inputs).
- Full inputs except herbicide and full inputs except fertilizer (about 480 lbs/acre lower yielding).
- Full inputs with 80 per cent seeding rate (about 420 lbs/acre lower yielding).
- Full inputs except fungicide (about 240 lbs/acre lower yielding).
- Full inputs except inoculant (about 180 lbs/acre lower yielding).
The difference in response to removal of the fungicide application between 2011 and 2012 is likely due to differences in environmental conditions. It is always best to scout your lentil crop to decide if a fungicide application is necessary.
The difference between the effects of variety (CDC Improve CL versus CDC Plato) could be due to a difference in weed pressure or establishment between 2011 and 2012.
The smaller reduction in the impact of no inoculant in 2012 was unexpected and the cause of this difference is unknown.
Large green lentil production and the production of any crop is continually being improved by a number of different factors. To make sure you get the best performance in the field, use the newest varieties, herbicides and fungicides and give the crop the nutrients it need.
For more information on WCA research and demonstrations, visit www.wheatlandconservation.ca.
For more information on the latest varieties and inputs or for fertilizer recommendations, visit Saskatchewan Agriculture’s website at www.agriculture.gov.sk.ca, contact your local Saskatchewan Agriculture Regional Office or talk to your local agrologist.