Chemical Properties and Moisture Extraction in Rangeland Soils as Influenced by Nitrogen Fertilization

Abstract

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Effect of Nitrogen Fertilization on Certain Factors of a Western Nebraska Range Ecosystem

“…Acid-extractable phosphorus in the soil decreased throughout the five-ft profile under increased nitrogen fertilization (Table 4). This is consistent with results reported by Smika et al (1961). The acid extractable phosphorus decreased Although differences in available soil moisture among fertilizer treatments were not significant at any sampling date, the fertilized treatments showed less available soil moisture at most sampling dates.…”

“…Most of the yield increase resulted from the response of western wheatgrass (Agropyron smithii) to nitrogen fertilizer. Smika et al (1961) investigated soil changes and variations in moisture extraction brought about by nitrogen fertilization. They reported that a 30 lb N /A application of ammonium nitrate reduced soil pH from 6.5 to 6.1.…”

Effect of 20 Years of Low N Rate Pasture Fertilization on Soil Acidity

“…Nine years of fertilization with NH4NO3 at the rate of 34 kg N ha 1yr-' reduced the pH of the surface 15 cm of a silt loam soil supporting native range from 6.5 to 6.1 (Smika et al 1961). A similar soil pH change with comparable N rates was reported for another study also conducted near Mandan, North Dakota (Rogler and Lorenz 1969).…”

Grazing Management, Season, and Drought Contributions to Near-Surface Soil Property Dynamics in Semiarid Rangeland

“…Levels of N inputs among grazing treatments likely affected soil pH trends over the 3-yr evaluation period, with increased soil acidification prevalent in the surface depth of CWP. The approximate 0.2 pH unit decrease in CWP over 3 yr was slightly greater than pH rate declines observed in related N fertilization studies under pasture (Smika et al 1961;Owensby et al 1969), and may be a reflection of decreased buffer capacity at lower pH . Drought-induced accumulation of soil NO 3 -N and NH 4 -N during year 3 occurred under CWP and HGP but not MGP.…”