Konferenzposter

Autorenliste: Macholdt, J; Styczen, M; Piepho, HP; Honermeier, B; Perryman, S; Macdonald, A; Poulton, P

Jahr der Veröffentlichung: 2020

DOI Link: https://doi.org/10.13140/RG.2.2.19637.29928/1

Abstract: 

The development of resilient cropping systems with high yield stability is becoming increasingly important due to future climatic and agronomic challenges. Consequently, it is essential to compare the effects of different agronomic management practices, such as crop rotation and fertilization, on the stability of crop yields. Long-term experiments are a valuable resource for investigating these effects, as they provide enough time to accurately estimate stability parameters. The objective of the current study was to compare the effects of crop rotation, mineral N fertilization, and additional organic matter supply on the yield stability of winter wheat and winter barley. For this purpose, the yield risk (the probability of yield falling below a threshold yield level) and inter-annual yield variability were used as stability indicators of the effects. Long-term yield data from the Broadbalk Wheat Experiment 1986-2017 (Rothamsted Research, UK) and the Crop Rotation Experiment Rauischholzhausen 1993-2019 (University Giessen, Germany) were analysed using mixed models giving residual maximum likelihood estimates including Shukla’s stability variance and Eskridge’s risk assessment approach. The results of the Broadbalk Wheat Experiment showed that rotational cropping combined with sufficient mineral N fertilizer, with or without organic manure, ensured stable wheat yields while reducing yield risk. In contrast, higher yield risks and inter-annual yield variabilities were found in continuous wheat sections with less mineral N fertilizer or with organic manure only. The impact of straw management (removal v. incorporation) when wheat was grown continuously was not conclusive and warrants further investigation. When straw was incorporated and wheat received inputs of manure, the inter-annual yield variability was lower and yield risk was higher than when straw was removed. When inorganic N only was applied, straw management did not appear to have an effect on yield risk, but did on inter-annual yield variability. Wheat yields were more stable when straw was removed than when it was incorporated, especially when wheat received more mineral N fertilizer. The results of the Crop Rotation Experiment Rauischholzhausen showed that winter barley grown in rotations dominated by cereals had lower inter-annual yield variability and greater production risks compared with barley grown in rotations with higher crop diversity and additional organic matter inputs. When barley yields were compared at three doses of mineral N, the highest yield stability was achieved with the medium N dose (70 kg N/ha), followed by the higher level of N (140 kg N/ha). The most unstable yields with the highest production risks were observed when barley was grown without any mineral N fertilization. Overall, the results of both LTE´s indicated that lower inter-annual yield variabilities do not automatically lead to reduced yield risks. The results further highlight the scope for improving system resilience and stability in crop yields through the use of favourable crop rotations and sufficient N fertilizer with additional organic matter supply.

Harvard-Zitierstil: Macholdt, J., Styczen, M., Piepho, H., Honermeier, B., Perryman, S., Macdonald, A., et al. (2020) Effects of crop rotation and fertilization on the inter-annual yield variability and yield risk of winter wheat and winter barley [Poster]. https://doi.org/10.13140/RG.2.2.19637.29928/1

APA-Zitierstil: Macholdt, J., Styczen, M., Piepho, H., Honermeier, B., Perryman, S., Macdonald, A., & Poulton, P. (2020). Effects of crop rotation and fertilization on the inter-annual yield variability and yield risk of winter wheat and winter barley [Poster]. https://doi.org/10.13140/RG.2.2.19637.29928/1