NUTRIENT FLUXES IN RUNOFF ON RESEEDED BLANKET BOG, LIMED AND FERTILIZED WITH UREA, PHOSPHORUS AND POTASSIUM

被引：7

作者：

WILLIAMS, BL

YOUNG, M

机构：

[1] Macaulay Land Use Research Institute, Aberdeen, AB9 2OJ, Craígiebuckler

来源：

SOIL USE AND MANAGEMENT | 1994年 / 10卷 / 04期

关键词：

D O I：

10.1111/j.1475-2743.1994.tb00482.x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Studies have been made of the effects of 15 g N/m2 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/m2 as granular superphosphate and 6 kg K/m2 as potassium chloride. Urea applications increased significantly (P < 0.05) the mean annual ammonium-N flux from 17 mg/m2 for the P + K plots to 245 mg/m2 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/l) on many occasions. Concentrations of organic-N in runoff exceeded those of ammonium-N, but were not significantly changed by fertilization.

引用

页码：173 / 180

页数：8

共 25 条

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