Crop rotation and drainage water reuse effects on agricultural water properties and productivity, Bakbakti irrigation system, Southern Kazakhstan.
Description
To evaluate the new water-saving methodologies, the Tasmurun Canal (TMC) drainage collector (K-2) was used as a source and sink for drainage water reuse. The primary objectives were to assess the water and salt balance and productivity of rice fields under mixed drainage and river irrigation, with rice-alfalfa crop rotation. An additional objective was to establish the chemical composition pathway from the surface to groundwater, which involved delineating chemical processes and salt transport in the soil profile and unsaturated zone. Once drainage irrigation reuse began, the total dissolved salts in the TMC increased and the chemical composition of irrigation, drainage and groundwater was changed. This change evolved from salt exchange processes in the soil during the infiltration of water with higher salinity and different chemical composition. A one-dimensional salt-moisture transfer modelling of the unsaturated zone suggests that with rice fields infiltration sustaining groundwater level high enough for alfalfa fields subirrigation, the rice-alfalfa field rotation could prevent soil profile salinization.
Files
Institutions
- Ariel UniversityJudea and Samaria Area, Ariel