2.4. Fertilizer treatments
2.4.1. Mineral NPK fertilizer (control)
Basic fertilizers were mixed with the soil in doses of ammonium
sulfate (21.5% N) at a rate of 100 N2 kg/fed; calcium
super phosphate (15.5% P2O5), and rock phosphate (30% P)
at a rate of 60 P2O5 kg/fed and potassium sulfate (48%
K2O) at a rate of 40 K2O kg/fed. In addition, agricultural sulfur
was used at a rate of (200 kg/fed).
2.4.2. Organic fertilizer
Complementary between 50% organic (chicken manure) at a
rate of 100 N2 unit/fed (5.850 m3
/fed) and 50% mineral
(NPK) was used. NPK is formed from ammonium sulfate
(21.5% N) was used as a source of nitrogen, at a rate of 100
N2 kg/fed; calcium super phosphate (15.5% P2O5) and rock