Figure 1

Time-dependent soil characteristics of the grapefruit field area. Dissolved organic carbon (DOC) (A–C), electric conductivity (EC) (D–F), and respiration (G–I) are shown. TW-C stands for transfer water control from Tajo River, RW-C for reclaimed water control and RDI for limited amount in summer (regulated deficit irrigation). The unit for respiration is mg CO2 per kg per day, for DOC mg C per kg and for EC µS per cm. Median, lower and upper quartiles are given. At each sampling time, data followed by the same letter are not significantly different according to the HSD test (P < 0.05).