Vergara - 1976 - Physiological and morphological adaptability of ri

532 FLIhL-XTE AND tater.
Groin yield
(tfhol
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° - IE5
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l "
Junu 20 July 5 July 24
i4sxwllcm= manual/cw? IBSKcuI/cmz
0 I l I
O 6O I20 O 6O 120 O 6O I20
N't l' d k lhfl
Seeding dubs
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i
4011020
s
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July 5 5 I 3
July 24
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C22 B 4R44 -2-5B El-Hurvnt data of IRE:
I
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Soul moisture tension (cbl
>
Roinfoll (rnmfwltl
240
200
I60
I20
80
4O
O
2 4 6 B l0 l2 l4 l6 l8 2O 22 24 26
Junel July l Aug I Sept ‘- Oct l N0v-—l-D9c-l
Week and month
l5. Nitrogen response of four Varieties grown under
upland conditions at tbur dates of seeding. with solar
radiation total for reproductive and ripening period and
rainfall and soil moisture tension in the experimental site
related to stage of crop growth. Fanncfs field. Stu.
TIIITHIS. fialurigas. Philippines. I973 wet season.
seeding. the stand establishment was poor Therefore. the crop in the first date
of seeding produced relatively low yields. 1R5. however. produced better yields
than the three other varieties and lines even under dry spells like the one which
occurred during the first seeding.
M148 was severely infected with sheath blight and IR442—2—58 with blast.
resulting in poor nitrogen response. Solar radiation ialues were not different
during the period of the three seeding dates because of fairly uniform rainfall
distribution (Fig l4)
In a farmers field in Sto. Toirias. grain yield differences were significant for
nitrogen levels. dates of seeding, and varieties as well as interactions among the