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

Table 5

Nitrate-N extracted from compost-amended soil, control, and nonincubated soil in a laboratory incubation study.

Treatment	N treatment equivalent	Soil nitrate-N	SE
(g dry compost added to 100 g dry soil)	(kg N/ha)	(mg/kg)
10	2,735	161.5 a	3.36
1	273.5	15.7 b	3.36
0	0	19.5 b	3.36
Nonincubated soil	—	15.2 b	3.36

Treatments connected by the same letter are not significantly different ().