Vergara - 1976 - Physiological and morphological adaptability of ri

Temperature t r 1
rsivrpsasrtats AND LIGHT. REPRODUCTIVE GROWTH AND RIPENING 191
Sunshine (hr)
MCDELL type l— MODEL type tl —
r: gmagsfl: rm;r+02r?+a3x~’+b4r‘+05;+¢
3. Two types ol‘ analysis with data stratified b)" temperature or sunshine hours. A) Stratified
h) temperature. htlodel: type I — l’ — in + h-s —- c; B) Stratified by sunshine hours. lvlodel:
type II — I‘ — hi: + hr + m‘ + bir" - bKS + c.
year. The term including 1 tvas used for analy-‘zing the number of spikelets. which
seemed to increase uith the improvement of cultural methods and varieties.
The third term was used for yield in some eases. The R= values in eaeh of the
ranges were calculated. and the square root of their weighted means over the
whole ranges (say R) are tised as the index of the climatic effectiveness at a given
stage. Also. the mean values of standard partial regression coefficients (say
b ', and-b '1) were obtained for evaluation of relative effects oft and s, respectively
This is an advantage oftype I.
When the data were stratified by sunshine hours (Fig. 3b}, the model was
represented by the following equation of 3rd or 4th degree of t, because of the
complicated t-Y, relation:
Y, = bit + by! + by + bi!‘ + bu‘ + (b6!) + c (type ll)
From this. however. individual effects of t and s can not be obtained. The merit
of type ll is to he able to obtain relatively high ulues ofR.
To find the model covering the whole ranges of I and s, many computer
trials were made. As a result. the frallovring model was proposed:
“(Yr)” = b!
| r P‘
T's-q‘
+ b: ti; + b3 gm- + biTt-Sr + b5~7lfi
+ he Si, + b7 I + c" (type III)
= z(b'.TP-‘.SQ‘) + C