Excerpts: Soviet grain production as well as yield data are in terms of "bunker weight," i.e., the weight of the grain as it comes from the combines. Thus the grain contains varying amounts of moisture and foreign matter depending mainly on weather conditions during harvesting. In analyzing Soviet grain utilization, it is desirable to be able to estimate the variation from year to year in the amount of moisture and foreign matter in the grain and to reflect this variation in the amount of grain included under "waste" in the grain utilization tables. The variation from average in the actual amount of precipitation received during the peak period in small grain harvesting is the main factor determining the moisture and foreign matter content of the grain. This conclusion was reached after considerable experimentation using various weather factors either singularly or in combination.