Seed rate and row spacing studies on winter wheat in northeast Saskatchewan
Peer Reviewed StatusNon-Peer Reviewed
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Winter wheat seed rate and row spacing combinations were studied with two cultivars on five sites in northeast Saskatchewan over the period 1986-1988. Increasing seed rate and decreasing row spacing resulted in an increase in grain yield for both tall and semi-dwarf cultivars. Increasing the seed rate from 70 to 140 kg/ha resulted in a 14 % yield increase. Decreasing the row spacing from 18 to 9 cm resulted in a 9 % yield increase. The combination of 140 kg/ha seed rate together with 9 cm row spacing produced a 19 % yield increase over the more conventional combination of 70 kg/ha seed rate and 18 cm row spacing. The tall cultivar, Norstar, out-yielded the semi-dwarf, Norwin, by 10 % and the difference was greatest on dry sites. A study of soil moisture depletion showed that prior to anthesis, a higher seed rate used more soil moisture, but after anthesis, more soil moisture was used by a lower seed rate. This pattern of soil moisture depletion was reflected in the fact that higher kernel weight was associated with lower seed rate.
Part OfSoils and Crops Workshop
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