By Philip Haygarth, Steven C Jarvis
This booklet is a set of cutting-edge stories at the international difficulties of diffuse water pollutants from agriculture, which impacts the water caliber of rivers, lakes, reservoirs and the oceans. It contains chapters on eutrophication, phosphorus, nitrogen, manure, heavy metals, carbon/persistent natural pollution and soil/siltation difficulties. The booklet is damaged down into 3 elements and displays the evaluations of the world's specialists in those topics.
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Additional info for Agriculture, Hydrology and Water Quality
1973) and Haygarth and Sharpley (2000). , 1977; Sharpley and Syers, 1979). Detachment mechanisms and loss as particulates are considered to dominate transfer in overland flow, but all forms and release mechanisms can contribute to loss via overland flow. , 1999). This is because overland flow preferentially erodes and transports clay-sized material (Sharpley, 1985). As shown in Fig. 1, total P and desorbable PO 43Ϫ are enriched in clay fractions. , 1981). This coincides with the depth of soil that often contains the greatest amount of P and can result in especially high concentrations in overland flow.
Areas of intensive livestock production). The following sections examine the basic sources and pathways of P in agricultural systems that can lead to the overapplication and consequent acceleration of transfer to watercourses. Livestock feeding and manure production Dietary P supplements are often used to maintain the optimum P requirements of livestock, because P deficiency can exert a number of negative effects on animal growth, productivity and fertility. 6% dry matter (Jongbloed and Everts, 1992).
D. = Not determined. Soil phosphorus Soils are the source of P for plant uptake and also for transfer to watercourses, so an understanding of soil P dynamics underpins the two fundamental aspects of agricultural P research. , 1995; Leinweber, 1996). , 1996). The proportions of organic P can range between 25 and 50% of total P in mineral soils and up to 60–90% in organic soils (Harrison, 1987). g. arable vs. permanent grassland and biological vs. conventional farming) and rates of P fertilizer/manure application all affect soil P contents and the ratio of inorganic to organic compounds.
Agriculture, Hydrology and Water Quality by Philip Haygarth, Steven C Jarvis