Changes of Soil Salinity due to Flooding in Newly Reclaimed Saline Soil

Changes of Soil Salinity due to Flooding in Newly Reclaimed Saline Soil

This study was carried out to identify the changes of EC during desalinization due to flooding in newly reclaimed saline soil. To do this, experimental plots were made of rotary tillage+water exchanging plot, flooding plot and rainfall flooding plot. In rotary tillage+water exchanging plot, drainage, rotary tillage and flooding were conducted at the interval of 7 days. In rotary tillage+water exchanging plot and flooding plot, plots were irrigated at the height of 10 cm. After 38 days desalinization, changes of EC values at top soil (0~20 cm) were as follows. In rotary tillage+water exchanging plot, EC decreased from 21.38 dS m-1 to 2.16 dS m-1 and in flooding plot, EC decreased from 13.97dS m-1 to 2.22dS m-1. In rotary tillage+water exchanging plot and flooding plot, EC values decreased below the EC criterion(4.0dS m-1) of saline soil. In rainfall flooding plot, EC values decreased or increased according to amounts of rainfall and rainfall time. After 38 days, EC decreased from 16.7 dS m-1 to 12.35dS m-1. In flooding plot, changes of EC due to soil depth were investigated. After 38 days desalinization, changes of EC due to soil depth were as follows. At 0~10 cm depth, EC value decreased from 13.08 dS m-1 to 0.74 dS m-1(94.3% of salt was desalinized). At 10~20 cm depth, EC value decreased from 14.80 dS m-1 to 3.69 dS m-1 (75.2% of salt was desalinized). At 20~30 cm depth, soil was desalinized slowly compared with upper soil, EC value decreased from 13.57 dS m-1 to 6.93 dS m-1 (48.9% of salt was desalinized).

This study was carried out to identify the changes of EC during desalinization due to flooding in newly reclaimed saline soil. To do this, experimental plots were made of rotary tillage+water exchanging plot, flooding plot and rainfall flooding plot. In rotary tillage+water exchanging plot, drainage, rotary tillage and flooding were conducted at the interval of 7 days. In rotary tillage+water exchanging plot and flooding plot, plots were irrigated at the height of 10 cm. After 38 days desalinization, changes of EC values at top soil (0~20 cm) were as follows. In rotary tillage+water exchanging plot, EC decreased from 21.38 dS m-1 to 2.16 dS m-1 and in flooding plot, EC decreased from 13.97dS m-1 to 2.22dS m-1. In rotary tillage+water exchanging plot and flooding plot, EC values decreased below the EC criterion(4.0dS m-1) of saline soil. In rainfall flooding plot, EC values decreased or increased according to amounts of rainfall and rainfall time. After 38 days, EC decreased from 16.7 dS m-1 to 12.35dS m-1. In flooding plot, changes of EC due to soil depth were investigated. After 38 days desalinization, changes of EC due to soil depth were as follows. At 0~10 cm depth, EC value decreased from 13.08 dS m-1 to 0.74 dS m-1(94.3% of salt was desalinized). At 10~20 cm depth, EC value decreased from 14.80 dS m-1 to 3.69 dS m-1 (75.2% of salt was desalinized). At 20~30 cm depth, soil was desalinized slowly compared with upper soil, EC value decreased from 13.57 dS m-1 to 6.93 dS m-1 (48.9% of salt was desalinized).