Vergara - 1976 - Physiological and morphological adaptability of ri

RICE PRODUCTIVITY I.\I CLIMATIL" REGIONS o? JAPAtN 461
NAR (q - m'Zleuf-duy"]
20
A
X
K
X
t l I
0 ° I00 200 xlO
s-tt
4. Relationships of NAR \}'ill1_ mean radiation within
the leaf layers §(¢\) and with S - N (B) in rice plants. with
data at difTercnt growth stages. years. and stations
included (lt-iurata. 1974). the mark x indicates a value
observed in the 3~week period starting from transplanting
S was calculated by equation (l) and N by (2). Correlation
coefficients 0.859 for .-l and 0.890 for B were
both significant at the 0.1 percent level. excluding those
points marked by x.
higher than for
for the pooled data excluding those obtained just after transplanting was as
high as 0.85.9. significant at the 0.1% level. indicating the outstanding effectiveness
of nitrogen content of leaf blades to represent the physiological state which
is in some way very closely" related to photosynthetic activity of the leaves.
On thc other hand. N was in a very clear functional relationship with the
number ofdays from transplanting. As two examples in Figure 5 show, the
logarithm of N is linearly correlated with the number ofdays from transplanting
1 regardless 0f the year.