The Uptake and Release Characteristics of Nutrients from Aquatic Ponds Constructed under Different Compost Application for Lotus (Nelumbo nucifera) Cultivation in Lake Juam, Korea.

To evaluate the uptake and release characteristics of nutrients from aquatic ponds constructed under different compost application for lotus cultivation, the experiment was consisted of a lotus pond with compost application (site I) and a lotus pond without compost application (site II) in Lake Juam, Korea. The maximum amount of TN uptake by lotus (Nelumbo nucifera) in site I (with compost application) and II (without compost application) were 56.3 and 32.1 g m^-2, respectively. The maximum amount of TP uptake by lotus in site I and II were 12.1 and 5.7 g m^-2, respectively. The amount of COD, TN and TP release from soil in site I was higher than that in site II. In the case of COD balance, the total amount of COD inflow from agricultural water and rainfall in site I and II during the growing period were 157.44 and 6.69 kg 10a^-1, respectively. The total amount of COD release from site I and II were about 31.10 and 13.46 kg 10a^-1, respectively. In the case of TN balance, the total amount of TN inflow from agricultural water and rainfall in site I and II during the growing period were 7.23 and 3.43 kg 10a^-1, respectively. In site I and II, the total amount of TN uptake by lotus were 56.27 and 32.07 kg 10a^-1, respectively. The total amount of TN release from site I and II were about 1.39 and 1.13 kg 10a^-1, respectively. In the case of TP balance, the total amount of TP inflow from agricultural water and rainfall in site I and II during the growing period were 8.08 and 0.19 kg 10a^-1, respectively. In site I and II, the total amount of TP uptake by lotus were 12.20 and 5.72 kg 10a^-1, respectively. The amount of TP release from site I and II were about 1.01 and 0.66 kg 10a^-1, respectively.