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Starter Phosphorus Rates For Spring Wheat

Dale Dietrich
with Tim Fiez and Baird Miller, WSU 

Objective

Compare rates of P starter fertilizer in spring wheat.

Location: Davenport, WA (Wilke Farm)
Precipitation: 16.4 inches (Sept 94 - July 95)
Variety: Penawawa
Rotation: Continuous spring wheat
Soil test P: 2.1 ppm (1st ft, acetate method)

Treatments

Check
5 lbs P/acre
10 lbs P/acre
15 lbs P/acre

Comments

All plots received 8 lbs of sulfur and 8 lbs of nitrogen per acre applied in the seed row and 60 lbs of nitrogen that was preplant applied.

Data

Yield, bu/ac
Treatment Rep 1 Rep 2 Rep 3 Rep 4 Average
Check 39 33 40 37 37
5 lbs P/acre 48 43 39 41 43
10 lbs P/acre 41 46 39 56 45
15 lbs P/acre 42 43 39 38 41
LSD (5%)         NS
CV         12%

 

Conclusion

There was some indication that moderate P rates between 5 to 10 lbs/acre resulted in greater yields as compared to the check. However, there were no significant differences. The plots were 250 feet long, and based on the variability observed (compare reps 3 and 4, for example), it would have been better to design the experiment with longer plots or more replications.

     
 

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