Reduction of Effluent Loads of Nitrogen and Phosphorus from Paddy Fields

Abstract

Effects of no-puddling culture and reducing fertilizer culture are examined for two years on outflow loads of nitrogen and phosphorus. Four paddy fields are used, these are called "no-puddling and reducing fertilizer division," "puddling and reducing fertilizer division," "no-puddling and conventional fertilizer division" and "puddling and conventional fertilizer division." In the reducing fertilizer divisions, nitrogen is treated into a nursery box, and phosphorus is treated by using a side fertilizer transplanter. In the conventional fertilizer divisions, fertilizer is broadcasted as usual.