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Table 3 Grain yield (GY), grain nitrogen uptake (GNUP) and total nitrogen uptake (TNUP) as influenced by the interaction effect of N fertilizer rate and time of N application

From: Effect of split application of different N rates on productivity and nitrogen use efficiency of bread wheat (Triticum aestivum L.)

N timing

N rate (kg ha−1)

N rate (kg ha−1)

N rate (kg ha−1)

120

240

360

120

240

360

120

240

360

GY (kg ha−1)

GNUP (kg ha−1)

TNUP (kg ha−1)

T 1

4436.40efg

4948.16def

5468.85cd

78.04fg

106.19de

127.5bc

96.27fg

131.45de

161.02bc

T 2

4076.89g

4356.21fg

4406.88efg

71.09g

91.56ef

100.24de

85.18g

114.12ef

124.20e

T 3

4307.19fg

5050.70de

4688.13efg

68.08g

91.22ef

94.79def

83.94g

116.11ef

121.24e

T 4

4362.17fg

5538.53bcd

6189.36ab

70.96g

110.15cd

134.17ab

92.97g

144.62cd

175.63b

T 5

4756.73ef

6060.04abc

6436.00a

82.49fg

128.96b

148.55a

100.05fg

170.04b

201.47a

Treated mean

5005.48a

100.27

127.76a

Control mean

1307.96b

24.89

28.36b

  

NR × NT

Treated versus control

 

NR × NT

Treated versus control

 

NR × NT

Treated versus control

CV (%)

 

7.2

3.84

 

9.72

2.32

 

8.72

1.51

  1. Means followed by the same letters for the same parameter are not significantly different at P ≤ 0.05
  2. CV Coefficient of variation, NR nitrogen rate, NT time of nitrogen application
  3. T1 = N application of ½ at sowing and ½ at tillering; T2 = N application at tillering; T3 = N application of ½ at tillering and ½ booting; T4 = N application 1/3 at sowing, 1/3 at tillering and 1/3 at booting; and T5 = N application ¼ at sowing, ½ at tillering and ¼ at booting