Reports of sulfur (S) deficiency symptoms in corn (Zea mays L.) fields of the Red River Valley of North Dakota and Minnesota are increasing. Current soil tests cannot predict the availability of S correctly due to the presence of gypsum in soils of this region. Field trials were conducted to determine corn yield and S uptake response to incremental applications of S (0, 11, 22, 33, and 44 kg S ha^–1) in the form of ammonium sulfate [(NH₄)₂SO₄]. Corn yield and S uptake varied significantly between sites. Out of 12 sites, only two sites had the highest corn yield without S application. Corn grain S removal ranged between 11 and 17 kg S ha^–1 at harvest. Fertilizer-S (SO₄) application did not result in a significant yield response. The current recommendation of 11 kg S ha^–1 may be necessary to reduce the risk of future S deficiency across this region and compensate for the removal of S in grain due to the uncertainty of adequate plant available S.

中文翻译：

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玉米对硫酸盐-硫磺增量施用的反应

北达科他州和明尼苏达州红河谷的玉米 ( Zea mays L.) 田中硫 (S) 缺乏症状的报告正在增加。由于该地区土壤中存在石膏，目前的土壤测试无法正确预测 S 的可用性。进行田间试验以确定玉米产量和硫吸收响应以硫酸铵 [(NH ₄ ) ₂ SO ₄ ]形式的硫（0、11、22、33和 44 kg S ha ^–1）增量施用。不同地点的玉米产量和 S 吸收量差异很大。在 12 个地点中，只有两个地点在未施硫的情况下玉米产量最高。收获时玉米粒 S 去除量在 11 到 17 kg S ha ^–1之间。肥料-S (SO ₄) 应用没有导致显着的产量响应。当前建议 11 kg S ha ^–1可能是必要的，以降低该地区未来 S 缺乏的风险，并补偿由于植物可用 S 充足的不确定性而导致的谷物中 S 的去除。