Emergence modelling of 18 species susceptible to be used as cover crops in Mediterranean semiarid vineyards

Abstract Cover Crops (CC) are increasingly appreciated in vineyards because they can provide ecosystems services, such as preventing soil erosion and compaction, increasing soil organic matter or, controlling weeds. Many species from different botanical families can be used depending on the final purpose of the CC, but their successful establishment in Mediterranean semiarid conditions of NE Spain can be challenging. Therefore, it is mandatory to understand and be able to predict the emergence patterns of the chosen species as their success is crucial to achieve a good soil cover. Different models based on thermal time (TT), hydrothermal time (HTT), photohydrothermal time (PhHTT) and photosolar hydrothermal time (PhSHTT) have already been used in crops and weeds for this purpose. In this paper, these four models have been developed for the 18 species susceptible of being CC, some of them being successfully validated with independent data from southern France. Results suggest that, although TT and HTT based models are accurate, their precision is improved when light is included (R2 >0.9). Models including light could be widespread used in some species as the successful validation with independent data demonstrates. These models considerably contribute to inter-row management in vineyards as decision support systems (DSS) tools to predict CC establishments.