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Table 7 Nitrogen application timing and rate in moderate N treatment at each experimental site in 2012 and 2013

From: Potential Yield Increase of Hybrid Rice at Five Locations in Southern China

Year

Site

N application timing and rate (kg ha−1)a

Total N application rate (kg ha−1)

Basal

Tillering

Panicle initiation

Spikelet differentiation

2012

Huaiji

56

60

30

15

161

 

Binyang

56

60

45

15

176

 

Haikou

56

60

45

0

161

 

Changsha

56

60

45

0

161

 

Xingyi

56

60

45

0

161

2013

Huaiji

56

60

60

15

191

 

Binyang

56

60

60

0

176

 

Haikou

56

60

45

15

176

 

Changsha

56

60

45

0

161

 

Xingyi

56

60

45

0

161

  1. aA chlorophyll meter was used to guide N application at panicle initiation and spikelet differentiation. SPAD was measured on the 10 topmost fully expanded leaves per plot as described by Peng et al. (1993). At panicle initiation, if SPAD < 37, apply 60 kg ha−1; if between 37 and 39, apply 45 kg ha−1; if > 39, apply 30 kg ha−1. At spikelet differentiation, if SPAD < 37, apply 45 kg ha−1; if between 37 and 39, apply 30 kg ha−1; if between 39 and 42, apply 15 kg ha−1; if > 42, apply 0 kg ha−1