Losses of nitrogen in the drainage water from paddy soils were determined in lysi-meter studies. The soils used were a latosolic and a calcareareous slate alluvial soils.
The results indicate that the amount of drainage water was larger in the first crop season than that in the second, for both soils studied. For the latosolic soil, the amounts were on the average, 66. 1 cm for the first crop and 29.5 cm for the second; and for the calcareous slate alluvial soil they were 31.9cm and 18.9cm, respectively.
The amounts of nitrogen lost in the drainage water were on the average 3.21 kg/ha and 0.16 kg/ha, respectively, for the first and second crops on the latosolic soil; and 0.75 and 0.25 kg/ha, respectively, for the calcareous slate alluvial soil.
Observation on the Leaching Losses of Nitrogen from Paddy Soi1s