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Leachability and Phytoavailability of Nitrogen, Phosphorus, and Potassium from Different Bio-composts under Chloride- and Sulfate-Dominated Irrigation Water

^a Dep. of Bio-environment Science, The United Graduate School of Agricultural Sciences, Tottori Univ., Tottori. Japan
^b Lab. of Soil Science, Faculty of Agriculture, Tottori Univ., Tottori, Japan

View larger version (23K): [in this window] [in a new window]   Fig. 1. Effect of compost types and saline irrigation on electrical conductivity and pH of leachate. Leaching events 1, 2, 3, 4, 5, 6, 7, 8, 9 refer to 8, 12, 18, 22, 26, 29, 32, 38, and 47 d after sowing, respectively (LSD at P = 0.05; n = 3).

View larger version (30K): [in this window] [in a new window]   Fig. 2. Effect of compost types and saline irrigation on maize dry matter yield. Small bars refer to SE. DW, total shoot or root dry weight per pot.

View larger version (46K): [in this window] [in a new window]   Fig. 3. Effect of saline irrigation and compost amendments on nutrient uptake and recovery. Small bars refer to SE.

View larger version (22K): [in this window] [in a new window]   Fig. 4. Effect of Cl–– and SO42––dominated saline irrigation water on NO3–N (a) and NH4–N (b) leaching from different compost amendments. Leaching events 1, 2, 3, 4, 5, 6, 7, 8, and 9 refer to 8, 12, 18, 22, 26, 29, 32, 38, and 47 d after sowing, respectively (LSD at P = 0.05; n = 3).

View larger version (15K): [in this window] [in a new window]   Fig. 5. Effect of Cl–– and SO42– –dominated saline irrigation water on dissolved reactive phosphorus concentration in leachate from different compost amendments. Leaching events 1, 2, 3, 4, 5, 6, 7, 8, and 9 refer to 8, 12, 18, 22, 26, 29, 32, 38, and 47 d after sowing, respectively (LSD at P = 0.05; n = 3).

View larger version (14K): [in this window] [in a new window]   Fig. 6. Effect of Cl–– and SO42––dominated saline irrigation water on potassium leaching from different compost amendments. Leaching events 1, 2, 3, 4, 5, 6, 7, 8, and 9 refer to 8, 12, 18, 22, 26, 29, 32, 38, and 47 d after sowing, respectively (LSD at P = 0.05; n = 3).