Table 3 Comparison of the agronomic use efficiency of fertilizer N (AEN), fertilizer N recovery efficiency (REN), physiological efficiency of fertilizer N (PEN) and partial factor productivity of fertilizer N (PFPN) among different N treatments in 2015 and 2016.

From: Split application of reduced nitrogen rate improves nitrogen uptake and use efficiency in sweetpotato

Cultivars

N treatments

2015

2016

AEN (kg kg−1)

REN (%)

PEN (kg kg−1)

PFPN (kg kg−1)

AEN (kg kg−1)

REN (%)

PEN (kg kg−1)

PFPN (kg kg−1)

XS22

100:0

55.4 b

37.6 c

147.5 b

241.4 c

55.1 b

43.7 b

126.1 b

269.7 c

80:0

53.6 b

43.4 b

123.7 c

286.1 b

54.3 b

46.1 b

117.7 c

322.5 b

40:40

119.4 a

60.0 a

198.9 a

351.9 a

128.9 a

67.5 a

190.9 a

397.1 a

SS19

100:0

59.1 b

40.2 b

146.9 b

255.5 c

69.6 b

49.4 b

140.8 b

308.5 c

80:0

56.4 b

43.6 b

129.3 c

301.9 b

64.1 b

53.9 b

119.0 c

362.8 b

40:40

134.7 a

64.3 a

209.4 a

380.3 a

151.4 a

71.7 a

211.0 a

450.0 a

Significance of factors

N treatment (N)

427.21**

88.41**

174.81**

96.91**

368.51**

51.20**

248.69**

125.36**

Cultivar (C)

10.03*

2.49ns

2.19ns

7.78*

32.11**

8.72*

19.91*

356.21**

N*C

3.14ns

0.6ns

0.84ns

0.42ns

1.78ns

0.26ns

2.99ns

3.68ns

  1. Means within a column followed by the same letter do not differ significantly at P < 0.05. F values and significance levels (**P < 0.01, *P < 0.05 and nsP ≥ 0.05) are given.
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