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The Impact of Intensive Utilization of Cultivated Land on Grain Yields: A Case Study of Shandong Province in China. International Journal of Sustainable Agricultural Research, [S. l.], v. 5, n. 4, p. 76–84, 2018. DOI: 10.18488/journal.70.2018.54.76.84. Disponível em: https://archive.conscientiabeam.com/index.php/70/article/view/264. Acesso em: 2 nov. 2026.