Table 3. Fastest time (h) to N4-a and N4-b waveform patterns within 12 h experiment.

Variety	n	N4-a	N4-b
Azuceana	7	1.0±0.2	3.4 d (±0.8)
Nipponbare	8	1.2±0.2	3.8 d (±0.7)
TN1	9	1.8±0.7	4.4 d (±0.8)
IR694	10	3.4±1.1	5.4 cd (±1.4)
Fujisaka	11	2.8±1.1	8.1 bc(±1.6)
IR758	10	3.4±1.1	8.3 bc (±1.6)
MR232	10	5.2±1.7	8.9 ab (±1.2)
MR219	10	5.6±1.2	10.1 ab (±1.0)
IR64	12	5.1±1.3	10.4 ab (±1.1)
Rathu	8	6.1±1.7	- a
Babawee	10	4.5±1.0	- a
F1	15	4.2±1.0	11.8 a (±0.2)
Average		3.7 ns±0.5	8.2** (±0.9)

Means± SE within columns followed by the same letters are not significantly different (P>0.05, Duncan test).

** =  Significant at 1% probability level; ns  =  Non-significant.

‘-‘  =  no N4-b waveform pattern observed in 12 h.