Effect of long-term application of swine slurry to a light soil on yield of crops
1990
Koc, J. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Katedra Chemii Rolnej)
A twelve-year field experiment was conducted on a sandy soil to study the effect of swine slurry applied at rates equivalent to 60-300 kg N/ha for each crop. In the third year of four-field rotation high yield increases were obtained: potatoes by 71 percent, oat grain by 142 percent, rye catch crop by 41 percent, maize for silage by 80 percent and winter rye grain by 143 percent. The highest yield was obtained when the slurry was applied at rates equivalent to 195-280 kg N/ha. Weather conditions were found to have the most important impact on swine slurry effectiveness. Application of slurry to the soil increased the content of nitrogen, phosphorus, calcium and magnesium in the crops. Utilization of nitrogen from the slurry by the crops in the whole rotation was 22 to 33 percent of the nitrogen added
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