Table 1.

Ratios of urea-N/ureide-N in the xylem sap and in each part of the soybean plants.

Treatment	Xylem Sap	Nodules	Roots	Stems	Leaves
Control	0.113	0.256	0.398	0.047	0.236
Sodium nitrate	0.246	0.154	0.458	0.07	0.212
Ammonium chloride	0.138	0.174	0.613	0.165	0.205
Urea	0.187	0.137	0.464	0.13	0.194
Non-nodulation	0.292		0.158	0.11	0.164