Under continuous no-till, gypsum has been successfully used to manage soil fertility and improve crop yield. Nitrogen (N) fertilization is critical for crop performance, however, since it is expensive and potentially pollutant, it must be correctly applied. Both subjects have been widely studied, yet there is a lack of information on the interaction between them, especially concerning crops in rotation or succession. The objectives of this study were to evaluate topdressing N fertilization (0, 50, and 100 kg N ha⁻¹) on black oat (Avena strigosa Schreb.) under no-till, inside a long-term gypsum experiment (0, 3, 6, 9, and 12 Mg ha⁻¹). We evaluated black oat regrowth after haylage harvest and nutrient concentration and uptake by aboveground biomass, as well as the effects of this system on the successor crop soybean (Glycine max (L.) Merr.) in terms of leaf nutrient concentration and grain yield over two growing seasons. The gypsum application, even up to 44 and 55 months earlier, presented a long-term effect when associated with N fertilization, causing black oat biomass to increase during the regrowth phase. Nitrogen fertilization increased black oat regrowth biomass, even without gypsum. Greater nutrient uptake by black oat regrowth occurred under higher gypsum rates and N fertilization, which may have been advantageous in the long term for the production system, once nutrient cycling may partially substitute fertilizer-derived nutrients. Soybean yield was not affected by either long-term gypsum or N applied at black oat tillering, even though some leaf nutrient concentrations were influenced.

在连续免耕下，石膏已成功用于管理土壤肥力和提高作物产量。氮 (N) 施肥对作物生长至关重要，但是，由于其价格昂贵且可能造成污染，因此必须正确施用。这两个主题都得到了广泛的研究，但缺乏关于它们之间相互作用的信息，特别是关于轮作或连续作物的信息。本研究的目的是评价追肥氮肥（0，50，和100公斤氮公顷^-1）上的黑色燕麦（燕麦strigosa茅）下免耕，长期石膏实验（0，3内， 6、9 和 12 Mg ha ^-1）。我们评估了干草收获后黑燕麦的再生长、养分浓度和地上生物量的吸收，以及该系统对继任作物大豆（Glycine max(L.) Merr.) 在两个生长季节的叶片养分浓度和谷物产量方面。即使在 44 个月和 55 个月之前施用石膏，当与施氮肥相关时，也会产生长期影响，导致黑燕麦生物量在再生阶段增加。即使没有石膏，施氮肥也增加了黑燕麦的再生生物量。在较高的石膏率和施氮肥下，黑燕麦再生吸收更多的养分，从长远来看，这可能对生产系统有利，一旦养分循环可能部分替代肥料衍生的养分。大豆产量不受在黑燕麦分蘖时长期施石膏或施氮的影响，尽管某些叶片养分浓度受到影响。