Coapplication of Chicken Litter Biochar and Urea Only to Improve Nutrients Use Efficiency and Yield of Oryza sativa L. Cultivation on a Tropical Acid Soil
Table 4
Biochar rate and fertilization schedule of the field study.
Plant growth stages
Early tillering growth
Active growth
Formation of stalk
Grain filling
Days after transplanting
15 to 20
35 to 40
50 to 55
70 to 75
Treatments
Biochar rates
g plot−1
T1
0
0
0
0
0
T2
0
Mix A2
40
Mix B1
Mix B1
T4
2000
55 urea only
40
18 urea only
18 urea only
T5
2000
40.3 urea only
30
14 urea only
14 urea only
T6
2000
27.5 urea only
20
9 urea only
9 urea only
T7
2000
13.8 urea only
10
5 urea only
5 urea only
T8
2000
0
0
0
0
Mix A2 = (55 g urea + 50 g TSP + 24 g MOP). Mix B2 = (18.3 g urea + 18.7 g TSP + 19.8 g MOP + 1.4 MgO).
