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The cultivation of maize (Zea mays L. Ver. Abelehii) was conducted using no-fertilization (control) and six fertilization treatments: (1) mineral fertilizer as NH4NO3 (IN-F); (2) agro-industrial waste compost (ECO-F); (3) gamma-irradiated DFS (not composted) pelletized with gamma-irradiated cassava starch (I-DFS-IR); (4) N-enriched DFS compost pelletized with irradiated cassava starch (EC-DFS-IR); (5) N-enriched DFS compost pelletized with pre-gelatinized cassava starch (EC-DFS-PG); and (6) N-enriched DFS + SD compost pelletized with pre-gelatinized cassava starch (EC-SDFS-PG). The DFS-based fertilizers were fortified with NH4NO3 to 3% N. In addition, P was applied as triple superphosphate (TSP containing 20% P) and K was applied as KCl (muriate of potash containing 50% K) (Table 2). The fertilizations were adjusted to correspond to NPK 150-150-170 kg/ha and 210-204-240 kg/ha. All pots were placed on the tables as a completely randomized block design with three replicates.

Table 2

Applied amounts of fertilizers in both growth media

 Ferric Lixisol and Cambisol
Treatments g/pot150 kgN/ha210 kgN/ha
Control None None 
IN-F mineral fertilizer (NH4NO3 + P + K) 3.06 g ( + TSP 5 g + KCl 2.3 g) 4.3 ( + TSP 7 g + KCl 3.2 g) 
ECO-F 36 ( + TSP 2.2 g) 50 ( + TSP 3 g) 
I-DFS-IR 36 ( + KCl 2 g) 50 ( + KCl 2.7 g) 
EC-DFS-IR/PG 36 ( + TSP 2.4 g + KCl 1.8 g) 50 ( + TSP 3.4 g +KCl 2.5 g) 
EC-SDFS-PG 36 ( + TSP 4.3 g + KCl 2.1 g) 50 ( + TSP 6 g + KCl 3 g) 
 Ferric Lixisol and Cambisol
Treatments g/pot150 kgN/ha210 kgN/ha
Control None None 
IN-F mineral fertilizer (NH4NO3 + P + K) 3.06 g ( + TSP 5 g + KCl 2.3 g) 4.3 ( + TSP 7 g + KCl 3.2 g) 
ECO-F 36 ( + TSP 2.2 g) 50 ( + TSP 3 g) 
I-DFS-IR 36 ( + KCl 2 g) 50 ( + KCl 2.7 g) 
EC-DFS-IR/PG 36 ( + TSP 2.4 g + KCl 1.8 g) 50 ( + TSP 3.4 g +KCl 2.5 g) 
EC-SDFS-PG 36 ( + TSP 4.3 g + KCl 2.1 g) 50 ( + TSP 6 g + KCl 3 g) 

For the application rate of 150 kgN/ha, each pot received 1.07 gN. For the application rate of 210 kgN/ha each pot received 1.5 gN.

See abbreviations in Table 1.

TSP, triple superphosphate.

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