Impact of repeated addition of swine manure and cattle manure on Cu and Zn amount and distribution in a Saskatchewan soil

Non-Peer ReviewedIncreasing use of animal manures in Saskatchewan requires information on the fate and distribution of residual manure copper (Cu) and zinc (Zn) in Saskatchewan soils. To address this issue, the amounts of soil Cu and Zn in various inorganic and organic fractions were investigated in a field crop research plot (Cudworth association soil) with a five year history of annual application of liquid swine manure and solid cattle manure, and in two grassland field research plots (Meota and Oxbow association soils) that had received annual application of liquid swine manure for three years. The annual rates of manure application were based on N contents in the manures, and were equivalent to approximately 0, 100, 200 and 400 kg total N ha-1 yr-1 in the field crop plots, and 0 and 100 kg total N ha-1 yr-1 in grassland plots. In both the field crop and grassland manured plots there were no substantial increases in total Cu and Zn in soils associated with manure application. Some increases in the moderately labile Cu and Zn fractions were observed in treatments with large amounts of animal manures applied every year. The liquid swine manure had less effect on increasing labile Cu and Zn fractions than cattle manure. These results indicate that annual addition of animal manures at rates of approximately 100 kg N ha-1 for 3 to 5 years does not constitute an environmental risk from Cu and Zn loading in these soils

Grain yield and protein content of durum wheat preceded by green manure

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Phosphorus amounts and distribution in soil as influenced by five years of repeated addition of liquid swine manure and solid cattle manure in east-central Saskatchewan

Non-Peer ReviewedLand application of livestock manure is usually considered for N needs of crops (Gburek et al. 2000). Although the N:P ratio in animal manures and effluent exhibit wide variations due to different sources and stockpiling, the manure N:P ratio is often smaller than the N:P uptake ratio of most crops (Gburek et al. 2000). It is reported that the average N:P ratio in manure from various cattle feedlots was around 2.7 (Watts et al., 1994; Eghball et al., 1997), while N:P grain uptake ratios in winter wheat, corn, and grain sorghum were 4.5, 5.9, and 4.5 respectively (Gilbertson et al., 1979). Thus, accumulation of P in soils may increase the risk of P escape from the soil system before it is used by subsequent crops (Sharpley et al., 1994; Lennox et al., 1997; Schoenau et al., 1999; Sims et al. 2000). A single application of swine manure at either low and high rates in Saskatchewan was found to have no significant impacts on increasing labile P forms in a Black Chernozemic soil (Qian and Scheonau. 2000a). However, after several years of application of animal manures, especially cattle manure, concerns over P loading have been brought to the attention of the livestock industry in Western Canada. Numerous reports show that long-term use of cattle manures and fertilizer P sources alter the amounts and distribution of P in the various pools of soil P, especially at higher P rates (Dormaar and Sommerfeldt, 1986; McKenzie et al., 1992a; Dormaar and Chang, 1995; Zheng et al, 2001). However, few studues have examined the effects of liquid swine manure addition on P distribution in prairie soils. The objective of this study was to evaluate and compare the effects of repeated applications of solid cattle manure and liquid swine manure on the amounts and distribution of P among various chemically distinguishable labile and stable P fractions in a Black Chernozemic soil in east-central Saskatchewan

Balancing the availability of nutrients in manured soils

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Effects of long-term swine manure application on soil and plant nitrogen and crop yield in an east-central Saskatchewan Gray Luvisol soil

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Nitrogen dynamics in manured Saskatchewan soils

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