| Abstrakt: |
Phosphogypsum (PG) can be used as an amendment for sodic soils, although little information is available regarding the effects of PG on soil properties and crop production at large-field scales. Thus, we evaluated the effects of PG amendment on the performance of wheat on sodic soils in two successive years (2020 and 2021). Two methods of PG application (band and broadcast) were allocated as the main plot, and five PG levels (0, 50, 100, 150, and 200% GR (gypsum requirement)) were randomly assigned as subplots with three replications. Trials were repeated on plots and pots that were used for growing haricot beans using the same treatments and design, and following harvestings, surface soil samples were collected from each plot. Averaged across the study site, PG application increased mean calcium, phosphorous, and sulphate contents by 25.32, 46.38, and 44.27% under broadcast and 47.49, and 44.41% under banded plots, respectively, while PG application decreased mean soil pH and ESP value by 15.68 and 70.84% under broadcast and 19.36 and 89.34% under banded plots, respectively compared to controls in 2020. Application of 200% GR during field tests increased grain yield by 49.08 and 41.31% in 2020 and 2021, respectively. Wheat yield increased with PG levels indicating that the PG level should be increased to obtain the yield curve. Repeating the experiment using higher levels of PG and at other sites on sodic or saline-sodic soil is recommended to draw sound conclusions. |
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