The propagation and seed multiplication of site‐adapted and drought‐tolerant grass varieties are essential to provide high‐quality forage in temperate grasslands. A field experiment was conducted from 2016–2019 on orchardgrass (Dactylis glomerata L.) in the province of Styria, Austria. Treatment effects of sulfur, fungicide application and a plant growth regulator, singly and in combination, on seed yield and its reproduction parameters were tested under two different fertilizer nitrogen management systems (single application [N1] and split application [N2]). In terms of seed yield, a combination of all treatments compared to fertilization‐only treatment showed a significant increase of 22% under N2 fertilization. In terms of the thousand seed weight, the fungicide treatments and a combination of all treatments performed significantly better than other treatments within N1 and N2. The use of fungicide and a combination of all treatments also significantly increased the germination capacity in N1. Therefore, a combination of all plant protection treatments is recommended to optimize seed yield, thousand seed weight and germination capacity.
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