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Nitrate‐nitrogen Accumulation under Bromegrass Sod Fertilized Annually at Six Levels of Nitrogen for Fifteen Years 1
Author(s) -
Larson K. L.,
Carter J. F.,
Vasey E. H.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300040003x
Subject(s) - nitrogen , nitrate , agronomy , human fertilization , soil water , forage , zoology , nitrogen fertilizer , environmental science , chemistry , biology , soil science , organic chemistry
An old bromegrass sod established prior to 1929 and fertilized annually since 1954 with nitrogen at rates from 0 to 298 kg/ha responded with increased forage, protein, and seed yields. Nitrate‐N content of the soil profile after 15 years of fertilization was analyzed using an Orion 401 specific ion meter with a NO 3 ‐N electrode to determine the possible pollution of ground water with nitrates attributable to increased nitrogen fertilization. Nitrate‐N content was similar below 106.7 cm to a selected depth of 137 cm during late April and of 152 cm during late June and August in 1969 under each of six fertility treatments. Highest concentration of NO 3 ‐N was found in the soil profile from 15.2 to 61.0 cm in depth. Results suggest apparent lack of NO 3 ‐N movement and accumulation in fine‐textured soils under northern climatic conditions even under high rates of continuous nitrogen fertilization.