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Nutrient fluxes in runoff on reseeded blanket bog, limed and fertilized with urea, phosphorus and potassium
Author(s) -
Williams B.L.,
Young M.
Publication year - 1994
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.1994.tb00482.x
Subject(s) - zoology , urea , chemistry , ammonium , phosphorus , potassium , nutrient , nitrate , agronomy , surface runoff , nitrogen , environmental chemistry , biology , ecology , biochemistry , organic chemistry
. Studies have been made of the effects of 15 g N/m 2 as urea in two dressings during April and June on annual nutrient fluxes in runoff from reseeded blanket bog also receiving annually 6 g P/m 2 as granular superphosphate and 6 kg K/m 2 as potassium chloride. Urea applications increased significantly ( P < 0.05) the mean annual ammonium‐N flux from 17 mg/m 2 for the P + K plots to 245 mg/m 2 for the N + P + K plots. Annual fluxes of total P, K and Ca were also increased ( P < 0.05) by the addition of urea. This was attributed to the effects of increased acidity around grass roots following N uptake as ammonium‐N. In contrast, nitrate‐N was removed from rainwater throughout the year and concentrations in runoff were at the limit of detection (< 0.01 mg/1) on many occasions. Concentrations of organic‐N in runoff exceeded those of ammonium‐N, but were not significantly changed by fertilization.