Abstract
The effects of various rates and times of nitrogen application on the yield of potatoes were determined in field experiments in Michigan. Both irrigated and non-irrigated trials were conducted with Katahdin, Russet Burbank, or Sebago varieties. Petioles were sampled for nitrate determinations one or more times during the growing season on each experiment, and the nitrate level in the soil was also followed throughout the season on Kent sandy loam.
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