Total field requirement of N, P2 O5, and K2O fertilization
amounts were calculated by soil testing, but 120 kg ha-1 was set
as a maximum limit for N rate and 30 kg ha-1 was applied as
minimum amount for P2O5 and K2O. Nitrogen (N) split rates
were 50% as basal application; 20% at tillering stage 14 days
after transplanting; and in VRF experiment, the third N applica-
tion at panicle formation stage was determined using plant
growth value [plant height (cm) x the number of tillers per m2 x
SPAD reading] and using a constant value of 7.5 for brown rice
protein content (Lee et al. 2009);