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Soil fertility changes trends and available Fe, Mn and Zn in a long-term system user nitrogen fertilizers
Nebojsa Gudzic, Miroljub Aksic, Aleksandar Djikic, Slavisa Gudzic, Jasmina Knezevic, Miodrag Jelić
Int. J. Agron. Agri. Res.7(
2),
14-20,
August 2015.