Evaluation of Two Irrigation Scheduling Methods and Nitrogen Rates on Corn Production in Alabama

Table 8

Nitrogen recovery efficiency (RE_n), nitrogen agronomic efficiency (AE_n), nitrogen internal efficiency (IE_n), and nitrogen partial productivity (PFP_n) at four N rates (0, 202, 269, and 280 kg N ha⁻¹) in 2014 and 2015 at TVREC.

N rate (kg ha^−1)

REn (%) ^ǂ

AEn (kg kg^−1)^§

IEn (kg kg^−1)^¶

PFPn (kg kg^−1)^#

2014

2015

2014

2015

2014

2015

2014

2015

Mean

SEǂ

Mean

SE

Mean

SE

Mean

SE

Mean

SE

Mean

SE

Mean

SE

Mean

SE

0

¤

¤

¤

¤

¤

¤

¤

¤

62.57^a

2.38

35.04 a

2.16

¤

¤

¤

¤

202

36.94^a¥

4.44

98.03^a

16.79

24.96^a

2.79

36.32^a

0.67

63.64^a

2.38

40.38^a

2.16

67.96^a

2.59

62.33^a

1.82

269

43.96^a

4.44

80.27^a

16.79

22.7^a

2.79

28.79^b

0.67

62.76^a

2.38

38.16^a

2.16

52.32^b

2.59

49.32^b

1.82

336

35.61^a

4.44

85.58^a

16.79

16.78^b

2.79

23.62^c

0.67

58.37^a

2.38

33.94^a

2.16

39.56^c

2.59

41.22^c

1.82

^ǂRen: recovery efficiency. ^§AEn: nitrogen agronomy efficiency. ^¶IEn: nitrogen internal efficiency. ^#PFPn: nitrogen partial productivity. ^¥Numbers at the same column followed by the same letter are nonsignificant at . ^¤Do not apply.