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Short-term responses of soils and crops to gypsum application on organic farms
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-04-12 , DOI: 10.1002/agj2.20669
Louceline Fleuridor 1 , Catherine Herms 1 , Steven Culman 2 , Warren A. Dick 2 , Pierce A. Paul 3 , Douglas Doohan 1
Affiliation  

Gypsum is a high calcium (Ca) and sulfur (S) containing mineral used to improve soil fertility and physical characteristics in organic cropping systems. However, evidence regarding short-term improvements in soil properties and increased crop yield is lacking. We conducted replicated experiments on 14 different organic dairy farm fields in five Ohio counties in 2017 and 2018. Our analysis evaluated short-term effects of gypsum application on (a) nutrient concentrations in soils and crop tissues, (b) yield of corn (Zea mays L.) and forage (alfalfa [Medicago sativa L.] or alfalfa–mixed grasses], and (c) and soil health properties. There were no effects on the yield of corn and forage after one or two annual gypsum applications. Still, gypsum consistently increased S concentrations (< .1) in soil and crop tissues as soon as 5 mo after each application. Gypsum had no measured effects on soil mineralizable carbon (C), penetrometer resistance, or unsaturated hydraulic conductivity in the short term. Soil protein, permanganate oxidizable C, and Mehlich-3 magnesium levels were lower after the second application (< .1). Our results indicate a short-term effect on some soil and crop nutrients but no additional benefits to soil health or crop yield in the short term when gypsum was applied to organically managed soils.

中文翻译:

土壤和作物对有机农场石膏施用的短期反应

石膏是一种含有高钙 (Ca) 和硫 (S) 的矿物质,用于改善有机种植系统中的土壤肥力和物理特性。然而,缺乏关于土壤特性短期改善和作物产量增加的证据。2017 年和 2018 年,我们在俄亥俄州五个县的 14 个不同的有机奶牛场进行了重复试验。我们的分析评估了石膏施用对 (a) 土壤和作物组织中的养分浓度,(b) 玉米(Zea mays L.) 和牧草(苜蓿 [ Medicago sativa L.] 或苜蓿混合草),以及 (c) 和土壤健康特性。在每年施用一两次石膏后对玉米和牧草的产量没有影响。仍然, 石膏持续增加 S 浓度 ( < .1) 在每次施用后 5 个月后立即在土壤和作物组织中出现。在短期内,石膏对土壤可矿化碳 (C)、渗透计电阻或不饱和导水率没有测量影响。第二次施用后,土壤蛋白质、高锰酸盐可氧化 C 和 Mehlich-3 镁含量较低 ( < .1)。我们的结果表明,当石膏应用于有机管理的土壤时,对某些土壤和作物养分会产生短期影响,但在短期内不会对土壤健康或作物产量产生额外的好处。
更新日期:2021-04-12
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