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AgRural表示，玉米产量下调的主要原因在于，基于玉米作物生长状况，本年度玉米单产预计为116.7袋/公顷，低于趋势线单产121.2袋/公顷。
按照AgRural的最新预测，巴西头季玉米产量将比2016/17年度减少21%。首季玉米也称之为夏季玉米。
今年9月份巴西天气高温干燥，影响到南部部分地区的玉米单产潜力。
AgRural预计2017/18年度巴西头季玉米播种面积为280万公顷，比上年减少16.2%，因为许多农户选择种植大豆，而减少玉米播种面积。
