Management and seasonal impacts on vineyard soil properties and the hydrological response in continental Croatia

Abstract

Soil degradation in vineyards is a global problem, indicating the need for the adoption of sustainable practices. Studies on the seasonal and long-term management impacts on soil properties and hydrological responses in vineyards are needed. Rainfall simulation experiments (60 mm h−1 for 30 min) and soil sampling were conducted on Cambisols in eastern Croatia during the dry and wet seasons in long-term grass-covered and tilled vineyards. The results show that bulk density (BD), soil organic matter (SOM), available phosphorous (P2O5), soil water content (SWC), mean weight diameter (MWD), and water-stable aggregates (WSA) were significantly higher in grass-covered plots than in tilled plots. WSA was significantly lower in the wet period, whereas the opposite trend was observed for SWC and MWD. The time to ponding (PT) and time to runoff (RT) were high (p < 0.05) in the tilled plot in the dry season and low in the wet season. The sediment concentration (SC), soil loss (SL), carbon loss (C loss), and P2O5 loss were significantly higher in the tilled plot than in the grass-covered plot. Runoff, SC, SL, C loss, and P2O5 loss were significantly lower in the dry period. Although the grass-covered plots exhibited high compaction, the stable structure reduced SL by 91% and 94% in the dry and wet seasons, respectively. The tilled plots increased disaggregation and the availability of sediments for transport, enhancing C loss (4.5 times higher) and P2O5 loss (6.4 times higher) compared with the values in the grass-covered plots. Tillage as an unsustainable practice was more pronounced in the wet season with 16.4, 10.1, and 11.1 times higher sediment, P2O5, and C losses, respectively, than those in the grass-covered plots. More sustainable practices are needed to decrease soil degradation and reverse these processes.