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The paper presents the results of analyses of samples of manure from a pig farm located near Piła, Poland per- formed between June 2011 and May 2012 using a single sampling system. Zygmunt Kowalski, Agnieszka Makara and Kamil Fijorek

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Profitable corn production requires an adequate soil fertility program. Insufficient nutrients will lower yields; excess nutrients will lower profit margins and may damage the environment through nutrient runoff and leaching. L.G. Bundy