Evaluation a moyen terme des besoins en engrais mineraux (N, P, K) d'une rotation en grandes cultures sur sol argileux | Mid term evaluation of mineral fertilizer requirements (N, P, K) of a field crop rotation on a clay soil
2011
Tremblay, G.J. | Boisvert, J. | Frechette, G.E. | Saulnier, M. | Alexandre, R. | Vanasse, A.
In Quebec, the recommended fertilizer requirements have been lowered since 1994. A study was undertaken from 1998 to 2005 in a 4-yr rotation of wheat (Triticum aestivum L.), soybean [Glycine max (L.) Merr.] and grain corn (Zea mays L.) to verify the mid-term mineral fertilizer requirements (N, P, K) for these field crops. Four levels of nitrogen (N) and three levels of phosphorus (P) and potassium (K) were compared on a clay soil of the Saint-Lawrence Lowlands. Nitrogen requirements based on this study corresponded to the recommended levels of each field crop tested. Recommended phosphorus rates did not maintain initial PM-III soil level (1998). However, crop yields were not affected by this decrease in soil PM-III level. To improve fertilizer recommendation tables, it should be relevant to determine with more accuracy the critical phosphorus and potassium values for field crops on other typical Quebec soils.
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