Synergistic Effect: Comprehensive Strategic Results of a Plant Protection Preparation and Agricultural Biogas Slurry in Enhancing Silage Maize Yield

This study aimed to investigate the effects of individual and combined applications of agricultural biogas slurry (ABS) and a plant protection preparation (GZM) on enhancing the yield of silage maize. In four different 15 ha fields of green silage maize, the treatments of control, ABS, GZM, and a combination of ABS and GZM were applied in sequence. After harvest, the yields and economic benefits of the four fields under different treatment methods were compared. The results indicate that the combined treatment of GZM and ABS significantly outperforms the individual treatments of either in terms of yield and economic benefits. When ABS was used in combination with GZM, silage maize yield increased by 5.0 t·ha −1 with a yield increase of 8.08%, and the average additional profit was 2038.8 RMB·ha −1 and they exhibited a synergistic effect in increasing silage maize yield. It can be seen that the combined use of GZM and ABS can effectively improve the yield and planting profit of silage maize, and it is recommended to vigorously promote its application in similar growing environments.