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Fertilizers applied in the fall and winter months in 2 years increased available soil nitrate at all sampled levels; largest increases were in the surface 3 inches. The greatest increase occurred in 1970. Differences in growth activity of the grass, and hence the rapidity of removal of available N, probably accounted for differences between the 2 years. Mean maximum temperature for the S-day period prior to sampling was 52 F in 1969, approximately 8F warmer than that for a similar period in 1970. Thus, growth in 1969, particularily on unfertilized plots on or about April 10, may have been utilizing all soil N available. This total use of mobilized soil N by growing grasses is not uncommon in grassland soils (Walker, 1956). Except for available soil nitrate data of March 14, 1969, the levels of available nitrate as influenced by the date of application also indicate agreement with the harvested yield data. Fertilizers applied in early fall of 1970 were exposed to dry soil conditions as long as 4 weeks. In February and March, 1969, application of N was on deep snow. Losses of N may occur through gaseous processes under these circumstances. Wullstein and Gilmour (1964) suggest that gaseous losses of N from surfaceapplied N fertilizers on rangelands may be of economic significance. If such losses took place in this trial and differed because of date of application, those differences were masked by other factors more dominant or similar for all dates.

Vegetative Response to Chemical Control of Broom Snakeweed on a Blue Grama Range