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New PDF release: Agriculture, Hydrology and Water Quality

By Philip Haygarth, Steven C Jarvis

ISBN-10: 0851995454

ISBN-13: 9780851995458

This ebook is a suite of cutting-edge reports at the worldwide difficulties of diffuse water toxins from agriculture, which impacts the water caliber of rivers, lakes, reservoirs and the oceans. It comprises chapters on eutrophication, phosphorus, nitrogen, manure, heavy metals, carbon/persistent natural toxins and soil/siltation difficulties. The publication is damaged down into 3 components and displays the evaluations of the world's specialists in those matters.

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Additional resources for Agriculture, Hydrology and Water Quality

Example text

1977; Sharpley and Syers, 1979). , 1980). , 1997; Turner and Haygarth, 2000). , 2000; Turner and Haygarth, 2000). , Hydrol. - Chap 02 9/9/02 9:29 AM Page 45 Phosphorus Studies using lysimeters have revealed that P concentrations in leachate water from a range of soil types occur at levels that could present problems for water quality. For example, Leinweber et al. (1999) and Turner and Haygarth (2000) measured TP concentrations routinely in excess of 100 µg lϪ1 in leachate from a range of contrasting grassland soil types and management conditions.

Soils under agricultural use had much higher DL-P concentrations: about 95% of samples from grassland, horticulture (raspberries, asparagus) and arable land had DL-P concentrations above the levels for crop response to P fertilizer addition. Soils in counties with a large stocking density in North Rhine-Westphalia had mean calcium-ammonium lactate extractable P (CAL-P) contents of 100–115 mg P kgϪ1. About 60–80% of soils in these counties had CAL-P contents classified as ‘high’ or ‘very high’ (Werner and Piehl, 1998).

Low molecular organic anions and higher molecular organic acids such as fulvic and humic acids compete with PO 43Ϫ and, possibly, organic P compounds, for sorption sites. Furthermore, chelating organic compounds may also contribute to the desorption of PO 43Ϫ. Hence, agronomic treatments that enhance soil organic matter content often also improve PO 43Ϫ availability. There is substantial evidence that redox dynamics are closely linked to the dynamics of sorbed and dissolved PO 43Ϫ in soil which can directly affect the amounts and forms that leach from soils.

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Agriculture, Hydrology and Water Quality by Philip Haygarth, Steven C Jarvis

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