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

Figure 2

Postexperiment soil Ca least squares means for composted manure rates in the 0 to 15 cm ((a), ) and 15 to 25 cm strata ((b), ), Mg least squares means in the 0 to 15 cm ((c), ) and 15 to 25 cm ((d), ) strata, and Mn least squares means for compost treatments in the 0 to 15 cm stratum ((e), ) and for urea treatments in the 15 to 25 cm stratum ((f), ). Error bars are ±1 SE of the mean. Bars connected by the same letter are not significantly different ( ≤ 0.05). Models contain preexperiment soil fertility factors (Table 10).

(a) 0 to 15 cm

(b) 15 to 25 cm

(c) 0 to 15 cm

(d) 15 to 25 cm

(e) 0 to 15 cm

(f) 15 to 25 cm