Impact of Forage Fertilization with Urea and Composted Cattle Manure on Soil Fertility in Sandy Soils of South-Central Vietnam

Table 3

Actual nitrogen (N) treatment rates were combinations of urea N and N in composted cattle manure.

Compost rate; (Mg DM/ha per yr)	Urea rate
	(kg N/ha per yr)
	0	60	120
0	0	60	120
4 ± 0.7	46 ± 12.4	106 ± 12.4	166 ± 12.4
8 ± 1.3	92 ± 24.9	152 ± 24.9	212 ± 24.9
12 ± 2.0	138 ± 37.3	198 ± 37.3	258 ± 37.3
24 ± 4.0	276 ± 74.7	336 ± 74.7	396 ± 74.7

Error is standard deviation and exists due to variation in compost composition over time during the experiment.