Figures (7)  Tables (0)

    • Figure 1. 

      (a) Box plots, and (b) histograms of pH and EC, and (c) log-10 transformed electrical conductivity (EC) values in paddy soil samples collected from Sri Lanka.

    • Figure 2. 

      (a) Soil pH and electrical conductivity (EC) in the lowlands used to cultivate rice in different climatic zones [DZ-Dry Zone, IZ-Intermediate Zone, WZ-Wet Zone], (b) agro-climatic zones [DL-Dry zone Low country, IL-Intermediate zone Low country, IM-Intermediate zone Mid country, IU-Intermediate zone Upcountry, WL-Wet zone Low country, WM-Wet zone Mid country], and (c) soil orders in Sri Lanka.

    • Figure 3. 

      Spatial distribution of soil pH and electrical conductivity (EC) in lowlands used to cultivate rice in different agro-climatic zones of Sri Lanka, DL-Dry zone Low country, IL-Intermediate zone Low country, IM-Intermediate zone Mid country, IU-Intermediate zone Up country, WL-Wet zone Low country, WM-Wet zone Mid country.

    • Figure 4. 

      Spatial distribution of soil pH and electrical conductivity (EC) in lowlands used to cultivate rice under different soil orders in Sri Lanka.

    • Figure 5. 

      Soil pH and electrical conductivity (EC) in the paddy fields used to cultivate rice in different soil orders and agro-climatic zones of Sri Lanka, DL-Dry zone Low country, IL-Intermediate zone Low country, IM-Intermediate zone Mid country, IU-Intermediate zone Upcountry, WL-Wet zone Low country, WM-Wet zone Mid country.

    • Figure 6. 

      Soil pH and Electrical conductivity (EC) in the paddy fields used to cultivate rice using different water sources and agro-climatic zones of Sri Lanka, DL-Dry zone Low country, IL-Intermediate zone Low country, IM-Intermediate zone Mid country, IU-Intermediate zone Upcountry, WL-Wet zone Low country, WM-Wet zone Mid country.

    • Figure 7. 

      Relationships between soil pH, soil EC, and grain yield of rice in Sri Lanka.